Job Reference Number
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TP/WII/32/2012
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Date Of Job Posting
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04-DEC-2012
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Last Date for Application
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04-DEC-2013
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Which nationality can apply
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Any Nationality
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Job Title
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Electronic Technician RTU
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Number of Years of Experience
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Minimum 3 to 5 years
in Substation Automation System (RTU/SCMS) & Troubleshooting skills.
Experience in Installation, Testing, Commissioning, upgrading and
trouble shooting of RTU/SCMS. Skill in wiring, soldering and replacing
electronics components will add an advantage.
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Minimum Educational Qualification
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Diploma in Electrical /Electronic Engineering
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Wednesday, May 15, 2013
Electronic Technician RTU | RTU Current Openings | RTU Jobs | RTU Careers | Remote Terminal Unit
Sunday, May 12, 2013
Remote Terminal Units (RTU) SPRECON-E-C
Due to the modular architecture and the facility of flexible
configuration, SPRECON-E also acts as the appropriate solution for
telecontrol.
The system allows configuration of new and modern telecontrol networks realised upon appropriate topologies. SPRECON-E components can be also integrated into existing networks without affecting the customer‘s philosophy in terms of system management and maintenance – a significant advantage for power utilities and infrastructures (electric power, gas, water, heating, etc.).
The devices can be operated via the detachable SPRECON-E-CP control panel with a colour display. SPRECON-V460 is applied as the superior SCADA.
SPRECON-E provides modules for direct or indirect process interfacing.
For More Details : http://www.sprecher-automation.com/en/products/sprecon-automation-devices/remote-terminal-units/
The system allows configuration of new and modern telecontrol networks realised upon appropriate topologies. SPRECON-E components can be also integrated into existing networks without affecting the customer‘s philosophy in terms of system management and maintenance – a significant advantage for power utilities and infrastructures (electric power, gas, water, heating, etc.).
The devices can be operated via the detachable SPRECON-E-CP control panel with a colour display. SPRECON-V460 is applied as the superior SCADA.
SPRECON-E provides modules for direct or indirect process interfacing.
Features of the SPRECON-E telecontrol
- Configuration of multi-hierarchical networks with remote diagnostics and remote parameterisation
- Integration into existing telecontrol networks as frontends and/or remote terminal units (i.e. outstations)
- Various communication protocols
- Integration of specific proprietary protocols
- Dial-up networking (VPN, GSM, PSTN, etc.)
- Integrated media converters (i.e. optical interface) and communication-modules (GPRS-modem, etc.)
- Configurable automation functions (function block diagram according to IEC 61131-3)
- Tunnelling functions for outstation messaging
- Integrated switch and IP security (encryption)
- Integrated firewall and routing functionality for highest security in telecontrol networks
Areas of application
Power supply applications- Extra-high, high and medium voltage switchgears as well as distribution systems
- Power plants (i.e. caloric, hydroelectric, helioelectric, wind, etc.)
- Traction power supply
- Industrial networks
- Electricity
- Water and sewage
- Gas and oil
- District heating
For More Details : http://www.sprecher-automation.com/en/products/sprecon-automation-devices/remote-terminal-units/
ROC RTU Solutions
ROC800-Series Remote Operations Controllers
The ROC800-Series has become an industry leader for a variety of remote automation applications. As a Remote Terminal Unit (RTU), the ROC800 has built a strong reputation as a rugged workhorse with great flexibility. The series consists of the ROC809 and the ROC827.
The ROC809 has a backplane that supports the central processing unit (CPU) module, power input module, three communication modules, and six I⁄O modules.
The base ROC827 has a backplane that supports the central processing unit (CPU) module, a power input module, and up to three communication or input⁄output (I⁄O) modules. You can expand the ROC827 by adding up to four expansion I⁄O racks. Each expansion I⁄O rack has a backplane and six slots to house I⁄O modules. The three modules of the ROC827—when combined with a maximum of four expansion I⁄O racks—allow expansion up to 27 slots.

The ROC800-Series has become an industry leader for a variety of remote automation applications. As a Remote Terminal Unit (RTU), the ROC800 has built a strong reputation as a rugged workhorse with great flexibility. The series consists of the ROC809 and the ROC827.
The ROC809 has a backplane that supports the central processing unit (CPU) module, power input module, three communication modules, and six I⁄O modules.
The base ROC827 has a backplane that supports the central processing unit (CPU) module, a power input module, and up to three communication or input⁄output (I⁄O) modules. You can expand the ROC827 by adding up to four expansion I⁄O racks. Each expansion I⁄O rack has a backplane and six slots to house I⁄O modules. The three modules of the ROC827—when combined with a maximum of four expansion I⁄O racks—allow expansion up to 27 slots.
For More Details : http://www.appliedcontrolequipment.com/?page_id=9343 |
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What is a RTU?
A remote terminal unit (RTU) is a device or system that interfaces with other equipment.
Typically, a RTU converts electrical signals from the equipment to digital values that represent such items as the open/closed status of a switch or valve and measurement values for pressure, flow, voltage, and current.
By converting these electrical signals and sending the digital values out to the equipment, the RTU can initiate control sequences such as opening or closing a switch or valve, and setting the speed of a pump.
Typically, a RTU converts electrical signals from the equipment to digital values that represent such items as the open/closed status of a switch or valve and measurement values for pressure, flow, voltage, and current.
By converting these electrical signals and sending the digital values out to the equipment, the RTU can initiate control sequences such as opening or closing a switch or valve, and setting the speed of a pump.
Saturday, May 11, 2013
KD-RTU6x00 Remote Terminal Unit (RTU)
The KD-RTU6x00 Remote Terminal Unit (RTU) is a low-cost terminal that features keypad, LCD display, RS-232, RS-485 (KD-RTU6600), Ethernet (KD-RTU6700), and your selection of optional reader: magstripe, barcode, and/or proximity reader.
The RTU functions as a remote terminal that is under the complete control of a host PC or other computer device and commnicates message text and commands in standard ASCII format via Ethernet, RS-485, or RS-232. It may be used with a magstripe or RFID proximity card-reader. Card-data and/or keypresses are automatically transmitted to any host PC or computer device. Pre-formatted ASCII data received from the host will be displayed on the LCD.
The heart of the system is a Rabbit Semiconductor OP6700 programmable terminal with 4x20 line LCD display, 12-key membrane keypad with relegendable keys. Rabbit Semiconductor is a renowned manufacturer of high-quality, affordable single-board computers and related products. Click here for more information on the programmable terminal.
The RTU offers features found in the higher end products, but at a fraction of the cost. How do we do it? The answer is simple - no overhead. You save big $$$ by purchasing the terminal unit(s) directly from the supplier. Some assembly may be required depending on the hardware configuration desired. For instance, a keypad-access configuration with no card-readers will require almost no assembly and will be the most economical. Or, you may choose to add one or even two card-readers. Once you've assembled the unit, we provide firmware programming for a nominal fee.
The RTU features a number of access options including barcode reader, proximity reader, and magstripe reader. If desired, card-readers may be excluded, allowing the system to be used in keypad-access mode - the most economical solution.
The RTU also accepts special host commands. These commands perform functions such as terminal configuration and setup. The RTU can also accept a command to activate or deactivate its onboard output driver. Suitable for controlling a small external relay, this output can be used in a variety of applications including gate activation, process control, alarm activation, etc. The open-collector output can sink up to 40VDC @ 200mA.
Optional host application software provides access to the RTU from your Windows PC. Great for monitoring and/or testing. Send pre-constructed messages to the terminal and receive terminal responses. Includes auto-detect feature and firmware upgrade utility.
The system is customizable to suit your needs.
Low-cost terminal - purchase directly from the supplier Completely customizable Enable/disable keypress buffering and/or time-date footer Firmware licensing for nominal fee Card-reader options: magstripe, proximity, barcode, keypad-only Communications options: Ethernet, RS-485, RS-232 Multiple RTUs may be networked Uniquely addressable Battery-backed real-time clock Open collector output signal controls an external relay Optional host application software (for Windows PCs) Firmware upgrade capability (plus fail-safe recovery) Great for time/attendance, security, access control, etc. Designed with OEMs in mind
For More Details : http://www.kadtronix.com/op6x00_rtu.htm
RTU A200
The A200 is Ami Tech's indigenously designed and developed Remote
Terminal unit, which form the life line of the SCADA solution. A200
acquires, monitors and controls data related to breakers, isolators,
transformers, transducers, etc., in a substation. The firmware of A200
interfaces with the main control centre using various communication
protocols compliant with IEC 60870-5-101/104, MODBUS, DNP3 and SPORT.
A200 is also compliant with IEC 61850, IEC 60870-5-103 and acts as a
gateway for various IEDs.
A200 is a scalable, modular and configurable remote terminal unit used extensively for a wide variety of applications in power, transportation, water, etc. It is capable of monitoring both digital and analog data, communicating with and controlling remote systems. A non-proprietary, open architecture system with high in-built security, designed and developed to work in tropical environment.
For More Details : http://www.amitech.in/RTUA200.html
A200 is a scalable, modular and configurable remote terminal unit used extensively for a wide variety of applications in power, transportation, water, etc. It is capable of monitoring both digital and analog data, communicating with and controlling remote systems. A non-proprietary, open architecture system with high in-built security, designed and developed to work in tropical environment.

Key Features
- 32 bit Industrial Grade CPU operating @ 300 MHz,256 MB SDRAM and 1 GB FLASH, 64 bit Data Bus.(Optional: expandable memory)
- Built-in real-time clock and SOE buffer with battery backup.
- Digital Inputs: Multiples of 16/32-channel Optically Isolated from field (5KV), 24V / 48V / 110V / 220V DC signal inputs, 3U size hot pluggable EURO card for easy expansion.
- External surge suppressor and scaling card to arrest surges at the input stage itself.
- Analog Inputs: Multiples of 8/16-channel single ended /differential inputs, 0 - 20mA / 4 - 20mA current signals, 0 5V single ended voltage inputs, -10V - +10V differential input voltages.
- Digital Output: Multiples of 8/16-channel relay drive card,inbuilt 24V / 48VDC contactors.
- Protocol support: IEC 60870 5 101 /102 / 103 / 104, IEC 61850, MODBUS RTU, SPORT and DNP3.
- Operating Temperature: -5° to +55°C and Humidity up to 95% RH non- condensing at 40°C.
- GPS time synchronization (optional) and standard in-built auto diagnostics.
- Hot redundant (optional) power supply, AC input 230V +/- 10%, DC input 48V +/- 10% or 250V DC +/- 10%, with input EMI / RFI suppression by line filter and input surge protection.
- Local and remote configuration and monitoring, local HMI.
- Communication media support Modem (Dial up / Leased line / RF), GSM / GPRS, CDMA, 3G, PLCC, Fiber optic / VSAT and LAN.
- Redundancy options for CPU, Power Supply and Communication.
- RTU is configurable using web based configuration and maintenance tool.
Rugged Design
- Designed to work in the harsh industrial environment
- High noise immunity
- Low power consumption
- Industrial grade motherboard
Cost Effective
- Embedded real-time Linux
- Local and Remote Configuration
- Highly scalable to address the present and
- future needs
- Local HMI
- Redundancy
- Processor Level
- Power Supply
- Ports
- Local Solid State Memory
Communication
- Modem PLCC
- LAN
- RS 232/485
- GSM/GPRS
Protocol
- IEC
- MODBUS
- DNP3
- SPORT
Scalable and Modular
- Hot pluggable 3U Analog and Digital I / O cards
RTU-300 controller
Controller RTU-300 is a part of Alpha CENTER metering system.
Controller RTU-300 is a family of data acquisition, processing, and communication units. There are three main variations RTU-300, RTU-310 and RTU-320. Each variation is based on an Remote Communications Server OS-9 platform and Windows NT operating system. The configuration software is simple and easy to use. The database and reporting tools are included as separate blocks and configurable on customer request.
The RTU differ in the controller types, capacity and the environment. Functional capabilities and capacity can be upgraded both, by means of replacing one RTU series with another, and by integrating of add-on modules into controllers. RTUs are designed for application at power utilities, industrial plants and other organizations which make independent mutual settlements with energy suppliers or consumers.
Basic RTU application – high-accuracy time-of-use commercial energy consumption (delivery) metering (in multiple-rate conditions), real-time preset load technical billing and monitoring. Data is collected from meters type ALPHA and EuroALPHA (IRPS “current loop”, RS232, RS422/485) via digital channels.
The RTU has a box-type design, protection class IP 65, and a cabinet-type design, protection class IP 55, which allows to install these units either directly at the objects or in data collection centers.
Application of a liquid-crystal display (LCD) with 128 per 128 points resolution allows to easily take readings from meters (connected to RTU) and obtain data calculated based on such readings. Special-purpose software is used for selection of data displayed on LCD as well as for RTU configuring.
The RTU provides the following functions:
For direct connection to individual RTU and for RTU group data readout (for instance, in the event of communication line breakdown) it is possible to take RTU readings directly at the object using portable computer type NoteBook with the following data transmission to the higher-level computer. The RTU will automatically restore data lost as the result of a line breakdown between the meter and RTU. On the basis of RTU-300 it is possible to design the distributed, hierarchical metering systems. A wide range of communication interfaces allows to create flexible metering systems based on RTU-300 with their customization depending on the infrastructure of a specific enterprise.
For More Details : http://www.elster.ru/en/441.html
Controller RTU-300 is a family of data acquisition, processing, and communication units. There are three main variations RTU-300, RTU-310 and RTU-320. Each variation is based on an Remote Communications Server OS-9 platform and Windows NT operating system. The configuration software is simple and easy to use. The database and reporting tools are included as separate blocks and configurable on customer request.
The RTU differ in the controller types, capacity and the environment. Functional capabilities and capacity can be upgraded both, by means of replacing one RTU series with another, and by integrating of add-on modules into controllers. RTUs are designed for application at power utilities, industrial plants and other organizations which make independent mutual settlements with energy suppliers or consumers.
- RTU-300 is the most powerful VME standard unit. RTU-300 maintains multi-level operating performance, along with providing reliability and flexibility in communication. RTU-300 was designed for the special series of AMR single purpose devices.
- RTU-310 provides more functionality
than the RTU-320. The standard RTU-310 uses an IUC32 controller (PEP Co.
Germany). The communication possibilities include Profibus and a local
Ethernet network.
RTU-320 uses a Motorola 68302 microprocessor and operates in a Profibus network as a slave. It can also be used with RS-485 to connect ALPHA meters and Splitter with halvanically isolated current loop interfaces (MPR16). - RTU-300 family has been certified in Russia, Ukraine, Byelarus and Kazakhstan as a type of measurement instrumentation for commercial energy billing. These units are produced since 1999, and up to now over 500 units have been installed at industrial plants and power utilities.
Basic RTU application – high-accuracy time-of-use commercial energy consumption (delivery) metering (in multiple-rate conditions), real-time preset load technical billing and monitoring. Data is collected from meters type ALPHA and EuroALPHA (IRPS “current loop”, RS232, RS422/485) via digital channels.
The RTU has a box-type design, protection class IP 65, and a cabinet-type design, protection class IP 55, which allows to install these units either directly at the objects or in data collection centers.
Application of a liquid-crystal display (LCD) with 128 per 128 points resolution allows to easily take readings from meters (connected to RTU) and obtain data calculated based on such readings. Special-purpose software is used for selection of data displayed on LCD as well as for RTU configuring.
The RTU provides the following functions:
- Collection, processing, logging, storage and display of energy meter data on required and delivered active and reactive energy and power.
- Combining of measurements taken from meters into common group measurements corresponding to specific objects.
- Time-of-use energy metering taking account of time zones within a preset time interval.
- Demand interval measurement (one of the two intervals: 1, 3, 5 minutes and 15, 30 minutes).
- Searching for power maximum within preset time intervals.
- Archiving according to preset structure.
- Supporting the universal time system to provide synchronous measurements.
- Keeping track of 2 preset excess power limits.
- Measured energy display by meter indicator readings.
- Parallel data transmission from RTU via physical line or dialup or dedicated telephone channels (or other communications environment) to several data collection centers.
- Protection of measured data and IVK metrological characteristics against tampering and unauthorized modifications.
- Internal operability monitoring.
For direct connection to individual RTU and for RTU group data readout (for instance, in the event of communication line breakdown) it is possible to take RTU readings directly at the object using portable computer type NoteBook with the following data transmission to the higher-level computer. The RTU will automatically restore data lost as the result of a line breakdown between the meter and RTU. On the basis of RTU-300 it is possible to design the distributed, hierarchical metering systems. A wide range of communication interfaces allows to create flexible metering systems based on RTU-300 with their customization depending on the infrastructure of a specific enterprise.
For More Details : http://www.elster.ru/en/441.html
DataSite RTU and Electronic Flow Meter
DataSite RTU and Electronic Flow Meter
When you need a rugged Remote Terminal Unit (RTU), the Allen-Bradley DataSite™ controller from Rockwell Automation is an excellent technology for service in harsh and extreme industrial environments like oil, gas, pipeline, electrical and industrial combustion applications. It is ideal for applications that require wide temperature ratings and low power consumption, and applications that are remote and powered by solar cells or wind power.
Electronic Flow Meter (EFM) versions of the DataSite controller incorporate AGA 3, AGA 7, and AGA 8 algorithms for computation of natural gas flow, making it well-suited for remote site natural gas well-head monitoring.
The DataSite controller is also available as a configured panel in a rugged NEMA 4X enclosure, which can be wall or pipe-mounted. Take advantage of the standardized design with multiple options such as an operator interface, wireless radio modems (three standard options, including antenna and cable accessories or the option to use your own) and a 12V DC or 24V DC system configuration.
Benefits
When you need a rugged Remote Terminal Unit (RTU), the Allen-Bradley DataSite™ controller from Rockwell Automation is an excellent technology for service in harsh and extreme industrial environments like oil, gas, pipeline, electrical and industrial combustion applications. It is ideal for applications that require wide temperature ratings and low power consumption, and applications that are remote and powered by solar cells or wind power.
Electronic Flow Meter (EFM) versions of the DataSite controller incorporate AGA 3, AGA 7, and AGA 8 algorithms for computation of natural gas flow, making it well-suited for remote site natural gas well-head monitoring.
The DataSite controller is also available as a configured panel in a rugged NEMA 4X enclosure, which can be wall or pipe-mounted. Take advantage of the standardized design with multiple options such as an operator interface, wireless radio modems (three standard options, including antenna and cable accessories or the option to use your own) and a 12V DC or 24V DC system configuration.

Benefits
- DataSite RTU and Electronic Flow Meter (EFM) Controllers:
- HiBeam Technology allows the DataSite controller to act as a web and eventbased data server. HiBeam also has tools for interfacing with your controller-based data through a standard web browser. Display device data and act on the controller data remotely over the Internet.
- Up to 8 flow runs can be configured on EFM units.
- DataSite Configured Panel:
- Standardized design provides multiple options to meet your application needs and help reduce your leadtime.
- Multiple radio options make it easier to integrate into your system.
For More Details :http://www.ab.com/en/epub/catalogs/12762/2181376/2416247/10766167/10766171/
Power RTU-SCD5200
The Foxboro SCD5200 combines the features and benefits of the Foxboro
RTU50 Series components with higher levels of communications,
integration, and engineering packaging. A state-of-the-art graphical
user interface is provided for the proven diagnostic tools while the
platform independence of the tools is maintained. Configuration tools
are similarly upgraded and extended to provide efficiencies in
engineering, system maintenance, and configuration management. A key
development of the SCD5200 is the integration of CPU, OptoNet, Power
Supply, and dual Ethernet into the main processor board (COPE). This
provides a compact single module for specialized communications, local
networking, applications.
A distributed architecture allows the full spectrum from small single device station configurations through to redundant power supply, processor, and I/O systems with redundant (duplicated and path diverse) communications networks.
A distributed architecture allows the full spectrum from small single device station configurations through to redundant power supply, processor, and I/O systems with redundant (duplicated and path diverse) communications networks.

Key Benefits
- Distributed processing for high availability and diversity in Electric Power Substation architectures
- Highly reliable operation over wide temperature and electrical noise ranges
Key Capabilities
- DNP, IEC 60870-101, 104, Modbus Interfaces
- WISP+ telecontrol protocol support
- IEC 61850 Client Data Mapping to for electrical substation monitoring
- Distributed Architecture
- Compact Multi-Chassis CPU arrangements
- Global Database over multiple connected nodes
- Use of Optical Interfaces throughout
- Compliance to Electric Power Standards for EMC and Voltage Isolation
- Database sizes up to 20,000 distributed points
FCN-RTU
High Performance with Low Power Consumption
With new features that reduce power consumption, the FCN-RTU is an evolution of the field proven FCN/FCJ architecture. A 256 MHz, 32 bit RISC processor assures both high performance and low power consumption. This low-cost model features four serial I/O ports and one Ethernet port that meet the minimum requirements of SCADA applications.
With new features that reduce power consumption, the FCN-RTU is an evolution of the field proven FCN/FCJ architecture. A 256 MHz, 32 bit RISC processor assures both high performance and low power consumption. This low-cost model features four serial I/O ports and one Ethernet port that meet the minimum requirements of SCADA applications.
- Modular architecture, with three expansion slots
- 12 AI, 2 AO, 16 DI, 8 DO, 2 PI, 1 AI (for battery monitoring)
- 3 RS232, 1 RS422/485, and 1 Ethernet ports
- Wide temperature range: -40℃ to +70℃
- Wide voltage range: 10-30 V DC

High Performance with Low Power Consumption
Depending on the application, the FCN-RTU can reduce its power consumption even further;
various functions such as automatic power saving mode make this possible.
various functions such as automatic power saving mode make this possible.
Thrives in Remote and Inhospitable Locations
With the FCN-RTU, there is no need to worry about conditions in remote locations.
The FCN-RTU thrives at temperatures as extreme as -40°C and +70°C and at altitudes up to 3,000 m.
The FCN-RTU thrives at temperatures as extreme as -40°C and +70°C and at altitudes up to 3,000 m.
Wide Voltage Range Ideal for Solar Power Applications
This controller also features an analog input for solar battery status monitoring that makes it possible to extend the life of the batteries.
For More Details : http://www.yokogawa.com/ncs/Stardom/Products/fcx/ncs-fcn-rtutop.htm
Remote Terminal Unit (RTU) products
Kingfisher and TBox brands
Semaphore offers two lines of RTU products for remote automation, monitoring and SCADA applications:TBox – Innovative, decentralized architecture enables the complete integration of programmable automation, alarm management, data logging and IP telemetry in a single, rugged package. Simple yet powerful platforms leverage web technologies and push messaging via e-mail, SMS text and FTP. TBox systems are easy to configure and offer dramatically reduced costs versus traditional PLC and SCADA architectures.
Kingfisher – The industry ’ s strongest RTU is based on an advanced, automation technology platform for SCADA applications. Kingfisher is the only RTU line that features an embedded programming environment that is compliant with both IEC 61131-3 and 61499 as well as an enhanced DNP3 protocol suite, security platform, complete array of communications networks and advanced functionality including redundancy.
For More Details : http://www.cse-semaphore.com/products/scada-systems-scada-rtu.php
Industrial RTUs
Intelligent Datalogging and Control in One Device
- Combine PLC, datalogger, industrial computer and communications gateway functionality
- Based on non-proprietary industry standards and open Linux operating system
Rugged Environmental Ratings
- UL, CSA, CE, ABS Marine and Zone 2 rated
- Supports temperatures ranging from -40 to 70°C
Many Communication Ports
- Open protocols enable advanced communication
- Modbus, Modbus TCP, IEC60870-5, DNP3, SNMP, Sixnet UDR
Scalable Automation
- Station addressing: 16,000 Sixnet or 247 Modbus nodes
- Theoretical distributed I/O addressing range 50,000+ Tags
Works with a Variety of Process Quality I/O Modules
- Unlimited I/O expansion
- Peer-to-peer I/O transfer capability
For More Details : http://www.sixnet.com/department/industrial-rtus-79.cfm
Remote Terminal Units, PLC's, Protocol Analyzers, and Protocol Conversion for the Power Industry
The Visionary line
of mini and micro RTUs provide remote monitoring and control
functions for poletop and small substation SCADA applications.
Each of our RTUs has PLC functionality and can also operate as
a stand-alone programmable logic controller. Along with our protocol converter, all of our
products combine feature-rich hardware designs with
user-friendly, intuitive software to give the technician in the
field powerful tools to meet any requirement with
pushbutton simplicity. And, with the ability to be
configured with any of 8 widely used industry
standard protocols, these units are capable of being
seamlessly integrated into a wide variety of SCADA
systems.
For More Products : http://www.viselect.com/products.html
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For More Products : http://www.viselect.com/products.html
RC500 RTU
The RC500 Remote Terminal Unit (RTU) is a modular and scalable
controller capable of all remote automation and control applications. In
conjunction with Honeywell’s powerful and feature-rich SCADA products,
it provides an integrated solution that solves complex remote automation
requirements

What Is It? | ||
The RC500 RTU is ideal for remote automation needs such as those found
in oil and gas applications. It is designed to withstand harsh
environments and can operate using minimal electricity, making it ideal
for operating on solar power and for providing continuous monitoring of
remote fixed assets. RC500 RTU’s open communication platform integrates
seamlessly with Honeywell’s Experion® Process Knowledge System (PKS).
This integration answers the most critical and complex automation needs
and brings in the latest technology offered by the Experion platform.
Honeywell offers multiple RTU models to suit
users’ specific application requirements. RTU variants are available
based on the number of communication ports needed, memory requirements,
system topology needs, protocol needs and type of input/output (I/O)
modules needed.
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How Does It Work? | ||
RC500 RTU has a variety of communication ports and enables easy I/O
expansion through connectivity to Ethernet I/Os. It supports industry
standard Modbus and DNP3 protocols over Serial and Ethernet. In
addition, it is capable of peer-to-peer I/O transfers, making it ideal
for transferring and sharing information between devices in a large
network.
Other key features include data-logging
capabilities with the option to record I/O values and log them into data
files. This means critical data from the field is not missed and is
available for analysis. The RTU also features self-resetting fuses, a
watchdog function for health monitoring while an Ethernet I/O module
delivers the best output across all common control applications.
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What Problems Does It Solve? | ||
RC500 RTU helps facilities effectively manage complex remote automation
and control applications such as gas flow metering, data concentrator
and communications integration, well-head control, pump and compressor
control, block-valve automation and gas stations, while ensuring a lower
total cost of ownership.
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SYNC 2100 Series: Intelligent RTU

SYNC 2100 series of intelligent Remote Terminal Units from Kalkitech are ideal for low to medium count IO monitoring. With customizable DI, DO, AI card options, SYNC 2100 products are ideally suited for varying Distribution Automation and IO monitoring requirements including a Feeder RTU (FRTU) in Ring Main Units (RMUs), auto-reclosers and sectionalizers. The device also comes with real-time embedded Linux OS and supports a host of protocols like IEC 60870-101/104, Modbus as well as option to have IEC 61850, DNP3.0 and wireless communications like GPRS/ CDMA and 3G over secure VPN connection.
The SYNC 2100 Remote Terminal Units have a large set of protocols support including IEC 61850, DNP3.0, IEC 60870-101/104 and Modbus. With numerous hardware and software options like IEC61850-3 and IP65 variants to IEC 61131-3 support, SYNC 2100 offers the largest flexibility and makes it ideal for Distribution Automation as well as for Substation Monitoring.
Following are the key features:
- General
- Enabled with smartgrid protocols IEC 60870-101/104, DNP3.0, Modbus and IEC 61850
- Upto 5000 data point support
- Last 10000 event storage
- Multi master communication capability
- Inbuilt protocol conversion capabilities
- Local/Remote communication over serial and ethernet port
- Local/Remote operation
- Automatic startup and initialization following power restoration
- Time synchronization using IEC60870/DNP3/SNTP
- Transparent/tunneling support for remote configuration and disturbance collection
- Device management using SNMP/webserver
- Time stamping resolution of 1 millisecond
- Device and communication redundancy supported
- Security
- Communication security using IEC 62351
- SSL based VPN with AES, DES or 3DES encryption over WAN/LAN
- NERC-CIP security compliant
- Reliability
- IEC 61850-3 compliant hardware
- Remote configuration and software update/FOTA
- Scalability and upgradability
- Inbuild and plug-in I/O support
- Custom card based on the requirement *
- Internal and external pluggable cellular modem (GPRS/EDGE/CDMA/UMTS)
- External pluggable RF modem
- Option for expanding communication port*
For More Details : http://www.kalkitech.com/products/sync-2100-series-intelligent-rtu?_kk=scada%20remote%20terminal%20unit&_kt=11ff87a3-ac8a-4ed5-b980-367b572846de&gclid=CNHT9qjkjrcCFU1C6wodyA0AAg
Remote Terminal Unit (RTU)
The versatile Remote Terminal Unit can interface a wide variety
of inputs and outputs to the ATI control system. Input from devices
such as wired or wireless push buttons, sensors and fire panels
can be configured to trigger system activations. The RTU outputs
can control a variety of external units during an activation. Examples
include traffic light control, strobe lights, gate control units,
radio repeaters and message signs. The RTU can also put out an audio
signal to provide alert messages or live voice to external PA systems
or radios.
Standard Features
- NEMA-4/3R enclosure cabinet
- RTU Controller Board equipped with eight 10 Amp/250VAC relay outputs, eight optically isolated inputs, four configurable analog data inputs, a tone generator and local push buttons for testing
- Conventional VHF or UHF radio and mounting hardware
- Temperature-compensated battery charger
- Intrusion switch
- Power On/Off circuit breakers
- Simple and compact hardware design
- Field-proven reliability
- Remote activation, testing and reporting
- Local and remote silent testing
- Standard VHF and UHF radio receives and transmits FSK data signals
- Very low standby power requirements
- Message encryption and security coding prevent unauthorized system activations
- Conformal-coated printed circuit boards for operating in harsh environments
- Temperature-compensated battery charger ensures batteries are at full capacity
Optional Features
- Trunked radio upgrade
- Additional radio for radio re-broadcast
- Hardwired push button, public address or strobe monitoring board
- Wireless push button receiver
- Flexible, redundant communication options including IP Ethernet, twisted pair/phone line, cellular, satellite
- Local control panel upgrade with microphone, LCD display and controls
- Antenna surge protector option
- Solar power option
- Strobe light or LED sign output options
- NEMA-4/3R stainless steel enclosure upgrade
1732 - Remote Terminal Unit
The Model 1732 can be used with third party Control Programs that support the MODBUS protocol.
Zetron offers a complete SCADA system comprised of Zetron RTUs and Controller integrated with National Instruments third-party MODBUS RTU Control Programs.
See Models 1708/1716 RTU information for RTUs ideal for smaller SCADA systems.
The Model 1732 is Zetron’s most powerful Remote Terminal Unit. It is typically used for large or complex sites. Communication between the Model 1732 RTUs and the Control Program can be via cellular phone, PSTN, radio, or wireline.
The Model 1732 has expandable inputs and outputs — up to 32 interface cards with up to 16 of any one type — Analog I/O, Digital I/O, and Relay Output. This modular architecture ensures that the Model 1732 can handle current Input/Output requirements with an upgrade path to a maximum of 445 I/O points.
The Model 1732 includes user-programmable control logic for PLC functionality. Control logic gives Model 1732 RTUs “ladder logic” functionality for pump rotation, emergency comm fail procedures, and other operations based on local inputs and outputs. In the event of a communications failure, the Model 1732 can operate in a failsafe mode and execute predefined local control.
A Windows®-based configuration utility simplifies RTU setup. Configurations are uploaded directly, by telephone, or over-the-air.
Product Features and Configuration
Zetron offers a complete SCADA system comprised of Zetron RTUs and Controller integrated with National Instruments third-party MODBUS RTU Control Programs.
See Models 1708/1716 RTU information for RTUs ideal for smaller SCADA systems.
The Model 1732 is Zetron’s most powerful Remote Terminal Unit. It is typically used for large or complex sites. Communication between the Model 1732 RTUs and the Control Program can be via cellular phone, PSTN, radio, or wireline.
The Model 1732 has expandable inputs and outputs — up to 32 interface cards with up to 16 of any one type — Analog I/O, Digital I/O, and Relay Output. This modular architecture ensures that the Model 1732 can handle current Input/Output requirements with an upgrade path to a maximum of 445 I/O points.
The Model 1732 includes user-programmable control logic for PLC functionality. Control logic gives Model 1732 RTUs “ladder logic” functionality for pump rotation, emergency comm fail procedures, and other operations based on local inputs and outputs. In the event of a communications failure, the Model 1732 can operate in a failsafe mode and execute predefined local control.
A Windows®-based configuration utility simplifies RTU setup. Configurations are uploaded directly, by telephone, or over-the-air.
Product Features and Configuration
- Connects to up to 445 I/O points
- Support digital and analog I/O connections
- Interfaces with Zetron M1730 Controller for wireless transfer of data
- MODBUS compatible
Micro RTU Controllers
Moxa’s
micro RTU controllers are compact, industrial-grade standalone RTUs for
remote monitoring and control applications. Moxa covers all your
Ethernet communication and Cellular needs with a variety of rugged
products. Moxa’s patented Click&Go™ offers easy and intuitive
“IF-THEN-ELSE” control logic. An active communication structure that
actively updates I/O status to the host is possible with Moxa’s patented
Active OPC Server™
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ioLogik E2210
Ethernet Micro RTU Controller with 12 digital inputs and 8 digital outputs -
ioLogik E2212
Ethernet Micro RTU Controller with 8 digital inputs, 8 digital outputs, and 4 configurable DIO -
ioLogik E2214
Ethernet Micro RTU Controller with 6 digital inputs and 6 relay outputs -
ioLogik E2240
Ethernet Micro RTU Controller with 8 analog inputs and 2 analog outputs -
ioLogik E2242
Ethernet Micro RTU Controller with 4 analog inputs and 12 configurable DIOs -
ioLogik E2260
Ethernet Micro RTU Controller with 6 RTD inputs and 4 digital outputs -
ioLogik E2262
Ethernet Micro RTU Controller with 8 thermocouple inputs and 4 digital outputs -
LDP1602 LCD Module
Snap-on module for the ioLogik E2200/R2100 and ioMirror E3000 series -
ioLogik W5312
GPRS Micro RTU Controller with 8 DIs, 4 DIOs, and 8 DOs -
ioLogik W5340
GPRS Micro RTU Controller with 4 AIs, 8 DIOs, and 2 relay outputs
Remote Terminal Units (RTUs)
Chemtrols offers Callisto family of Remote Terminal Units from Remsdaq.
This feature-rich building block for utility automation offers a single
solution from a simple pole-top device to a fully integrated Substation
Control System. Callisto has small compact hardware that is ideally
suited for use as Bay Controller, which can be easily mounted in the Bay
Control Panels. The distributed architecture of Callisto allows
Individual units to be connected together over a LAN. This drastically
cuts down the cost of cumbersome wiring and makes the installation
simple.
With its flexible approach to I/O, Callisto offers cost effective technology for applications ranging from a conventional RTU to a sophisticated IEC 61850 implementation.
Callisto offers high accuracy for Transducer-less AC measurements, disturbance and event recording and a wealth of protection functions.
This high performing unit is backed by simple-to-use configuration tools, an industry standard IEC 61131-3 logic application and secure web browser technology.
Compliant to the latest IEC 61850 standard, Callisto RTUs include an extensive library of standard communication protocols like IEC 60870-5-101 / 103 / 104, DNP 3.0 and Modbus.

For more details : http://www.chemtrols.com/remote_terminal_units.aspx
With its flexible approach to I/O, Callisto offers cost effective technology for applications ranging from a conventional RTU to a sophisticated IEC 61850 implementation.
Callisto offers high accuracy for Transducer-less AC measurements, disturbance and event recording and a wealth of protection functions.
This high performing unit is backed by simple-to-use configuration tools, an industry standard IEC 61131-3 logic application and secure web browser technology.
Compliant to the latest IEC 61850 standard, Callisto RTUs include an extensive library of standard communication protocols like IEC 60870-5-101 / 103 / 104, DNP 3.0 and Modbus.

For more details : http://www.chemtrols.com/remote_terminal_units.aspx
RTU: Remote Terminal Unit
Remote Terminal Unit (RTU) is a device located at a remote site to
collect data and transmit the data back to a central station (or
master). An RTU also collects information from the master device and
implements processes that are directed by the master. RTUs are equipped
with input channels for sensing or metering, output channels for
control, indication or alarms and a communications port. RTU is usually
part of the SCADA system.
ACE3600 RTU - Remote Terminal Unit

The ACE3600 RTU combines the local processing of a PLC with the superior communications of an RTU for an all-in-one high-performance unit. It allows seamless integration with multiple PLCs, RTUs and Intelligent Electronic Devices (IED). A powerful processor combined with versatile input/output modules allows this RTU to be used for the most demanding SCADA applications, including those in:
- Electric Utilities
- Oil & Gas
- Water & Wastewater
- Siren/PA
This modular RTU can be expanded with multiple, simultaneously operating communication ports in a range of industry protocols. The communication capability is specifically designed to support secure communications over diverse networks.
Features and Benefits
Remote control and monitoring applications
Water/Wastewater: Improve distribution system or collection system operation, optimize treatment plants and realize chemical and energy savings.
Electric power distribution: Implement Distribution Automation systems by controlling load break switchgear, reclosers and other IEDs (intelligent electronic devices).at substations, pad or pole top locations.
Oil & gas pipelines: Monitor and control flow, pressure, cathodic voltage; perform emergency shutdowns, monitor remote exploration and storage sites.
Early warning/siren control: Perform routine tests and remotely activate sirens for public annunciation of emergency conditions.
Communication network monitoring and control: Perform remote monitoring of critical equipment such as power systems, environmental control systems, tower lights, etc.
Fire station alerting: Quickly dispatch fire equipment and resources with remote control of lights, sirens, voice public address systems, doors, etc.
Versatile communications options
Supports up to 5 ports, ACE3600 can simultaneously communicate over RS-232, RS-485, radio and IP, while using the same/different protocols.
Flexible Input/Output options
0,3,5,7 or 8 I/O slot options (plus 19”rack) with support for up to 104 I/O modules. All I/O are hot swap replacement including the high-voltage digital modules.
Data security
ACE3600 supports encryption over wireless with downloadable keys.
Graphical User Interface
The System Tool Suite (STS) programming tool features user-friendly, menu-driven GUI that allows program development and local and remote system setup and maintenance.
Industry-accepted protocols
ACE3600 RTU supports multiple industry protocols such as Modbus, DF-1, DNP3.0, and IEC 60870-5-101 and allows direct connection of smart sensors, PLCs and IEDs.
Motorola Data Link Communication (MDLC) protocol
MDLC protocol has robust error handling to provide reliable communication. It enables RTU-to-control-center and RTU-to-RTU direct communications without a dedicated repeater.
MOSCAD Compatibility
With MDLC protocol, new ACE3600 RTUs can be easily integrated with existing MOSCAD family RTUs into a single system.
Water/Wastewater: Improve distribution system or collection system operation, optimize treatment plants and realize chemical and energy savings.
Electric power distribution: Implement Distribution Automation systems by controlling load break switchgear, reclosers and other IEDs (intelligent electronic devices).at substations, pad or pole top locations.
Oil & gas pipelines: Monitor and control flow, pressure, cathodic voltage; perform emergency shutdowns, monitor remote exploration and storage sites.
Early warning/siren control: Perform routine tests and remotely activate sirens for public annunciation of emergency conditions.
Communication network monitoring and control: Perform remote monitoring of critical equipment such as power systems, environmental control systems, tower lights, etc.
Fire station alerting: Quickly dispatch fire equipment and resources with remote control of lights, sirens, voice public address systems, doors, etc.
Versatile communications options
Supports up to 5 ports, ACE3600 can simultaneously communicate over RS-232, RS-485, radio and IP, while using the same/different protocols.
- Analog conventional radios
- Analog or digital trunked systems
- Multiple Address Systems
- Telephone/leased lines, and fiber-optic links
- Microwave and satellite
- Wired and Wireless IP networks
Flexible Input/Output options
0,3,5,7 or 8 I/O slot options (plus 19”rack) with support for up to 104 I/O modules. All I/O are hot swap replacement including the high-voltage digital modules.
Data security
ACE3600 supports encryption over wireless with downloadable keys.
Graphical User Interface
The System Tool Suite (STS) programming tool features user-friendly, menu-driven GUI that allows program development and local and remote system setup and maintenance.
Industry-accepted protocols
ACE3600 RTU supports multiple industry protocols such as Modbus, DF-1, DNP3.0, and IEC 60870-5-101 and allows direct connection of smart sensors, PLCs and IEDs.
Motorola Data Link Communication (MDLC) protocol
MDLC protocol has robust error handling to provide reliable communication. It enables RTU-to-control-center and RTU-to-RTU direct communications without a dedicated repeater.
MOSCAD Compatibility
With MDLC protocol, new ACE3600 RTUs can be easily integrated with existing MOSCAD family RTUs into a single system.
For More Details : http://www.motorolasolutions.com/US-EN/Business+Product+and+Services/SCADA+Systems/ACE3600+RTU
ION7550 RTU - Remote terminal unit for data acquisition and integrated utilities metering
The PowerLogic ION7550 RTU (remote terminal
unit) is an intelligent, web-enabled device ideal for combined utilities
metering of water, air, gas, electricity and steam (WAGES). The device
collects, scales, and logs readings from a large number of connected
meters or transducers and delivers the information to one or more
head-end systems through a unique combination of integrated
communication gateways.
Characteristics
Characteristics
- Up to 10 Mbytes of memory
- 1 pulse output
- 24 digital or analogue inputs (max)
- 30 digital or analogue outputs (max, including pulse output)
- Ethernet port (Modbus/TCP/IP protocol)
- Modbus TCP Master / Slave on Ethernet port
- Optical port
- RS 485 port
- RS 485 / RS 232 port
- Modbus RTU Master / Slave (Serial port)
- Internal modem
- Modem gateway (ModemGate)
- DNP 3.0 through serial, modem, and I/R ports
- Alarm notification via email (Meterm@il)
- HTML web page server (WebMeter)
Benefits
You can reduce waste and optimise equipment operation to increase
energy efficiency. Featuring a large, intuitive display; extensive
digital and analog I/O; and the overall versatility of the PowerLogic
system, the ION7550 RTU provides a cost-effective, dedicated WAGES
solution when compared to a traditional meter.
Applications
- WAGES (water, air, gas, electricity, steam) metering
- Integrated utility metering with advanced programmable math functions
- Data concentration through multi-port, multi-protocol communications
- Equipment status monitoring and control
- Programmable set points for out-of-limit triggers or alarm conditions
Emerson Remote Terminal Units (RTUs)
Remote Terminal Units (RTUs)
Whether you are looking for maximum flexibility or fit-for-purpose, we have the right RTU for your application.
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AutoLog RTU Remote Terminal Unit
AutoLog RTUs - are the mountain top products - results of over 35
years of hardware design, manufacturing and field experience. Tens of
thousands AutoLog RTUs are operating all over the world in different
kinds of remote monitoring and controlling applications. For example
world biggest oil producer company Saudi Aramco uses AutoLog RTUs in its
nation wide pipeline monitoring system. AutoLog RTUs can communicate
using different madias:

BENEFITS: Designed for harsh weather conditions, very long operating time, failproof components and manufacturing quality, product can be designed cost effectively according to project needs, FF-Automation can offer complete solution including SCADA, communication equipments, RTUs, training and maintenance plan etc.
For More details : http://www.ff-automation.com/products/rtu-remote-terminal-unit.shtml
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GSM-RTU (GSM / GPRS Network)
-
Radio-RTU (Radio modem UHF / VHF network)
-
TETRA-RTU (TETRA Terrestrial Trunked Radio Network)
-
Other: Ethernet, Wi-Fi, RS-485, RS-232, satellite, etc.

BENEFITS: Designed for harsh weather conditions, very long operating time, failproof components and manufacturing quality, product can be designed cost effectively according to project needs, FF-Automation can offer complete solution including SCADA, communication equipments, RTUs, training and maintenance plan etc.
For More details : http://www.ff-automation.com/products/rtu-remote-terminal-unit.shtml
Secure Remote IP Access with Asentria SiteBoss™ Units

Security, while accessing equipment in remote locations, is a top priority in today's communication landscape. Asentria provides a full range of remote terminal units and software tools to allow Secure Remote IP Access, helping to reduce the operating costs of your communication network.
With access via internal GSM wireless modem, CDMA wireless modem, or standard Ethernet, a SiteBoss unit allows the connectivity to attached remote devices as if the user were at the site directly.
Asentria has a variety of products that
have traditionally been referred to as Remote Terminal Units (RTU). An
RTU traditionally has been a device that was a part of a communication
network that would monitor contact closures, analog measurements, or
perhaps perform some parsing and evaluation of a legacy protocol. In
most cases today, this data is converted into the Simple Network
Management Protocol (SNMP), which is a commonly desired alarm format
that many devices within a communication network can report on their
status.
In existing equipment rooms, contact closures, analog points, and relays may often already be terminated to a legacy RTU type of device. One of the most common uses of Asentria products is to replace existing legacy RTU’s, such as a “Badger” device, to enable the transmission of alarms via a more modern alarm standard such as SNMP. Asentria products have great flexibility in providing various I/O counts, and can provide alarms in any standard SNMP format, as well as offer paging, SMS, and other more unusual alarm methods.
In existing equipment rooms, contact closures, analog points, and relays may often already be terminated to a legacy RTU type of device. One of the most common uses of Asentria products is to replace existing legacy RTU’s, such as a “Badger” device, to enable the transmission of alarms via a more modern alarm standard such as SNMP. Asentria products have great flexibility in providing various I/O counts, and can provide alarms in any standard SNMP format, as well as offer paging, SMS, and other more unusual alarm methods.
For more details :http://www.asentria.com/solutions/rtu-app-snmp.aspx
RTU - Remote Terminal Unit
A remote terminal unit (RTU) is a microprocessor-controlled electronic device that interfaces objects in the physical world to a distributed control system or SCADA (supervisory control and data acquisition) system by transmitting telemetry data to a master system, and by using messages from the master supervisory system to control connected objects. Another term that may be used for RTU is remote telemetry unit, the common usage term varies with the application area generally.
An RTU may consist of one complex circuit card consisting of various sections needed to do a custom fitted function or may consist of many circuit cards including CPU or processing with communications interface(s), and one or more of the following: (AI) analog input, (DI) digital input, (DO/CO) digital or control (relay) output, or (AO) analog output card(s).
RTUs may include a battery and charger circuitry to continue operation in event of AC power failure for critical applications where a station battery is not available.
The RTU or host system translates and scales this raw data into the appropriate units such as gallons of water left, temperature degrees, or Megawatts, before presenting the data to the user via the HMI.
RTU outputs may also consist of driving a sensitive logic input on an electronic PLC, or other electronic device using a sensitive 5 V input.
Data transfer may be initiated from either end using various techniques to insure synchronisation with a mimimal data traffic. The master may poll its subordinate unit (Master to RTU or the RTU poll an IED) for changes of data on a periodic basis. Analog value changes will usually only be reported only on changes outside a set limit from the last transmitted value. Digital (status) values observe a similar technique and only transmit groups (bytes) when one included point (bit) changes. Another method used is where a subordinate unit initiates an update of data upon a perdetermined change in analog of digital data. Periodic complete data transmission must be used periodically, with either method, to insure full synchronisation and eliminate stale data. Most communication protocols support both methods, programmable by the installer.
Multiple RTUs or multiple IEDs may share a communications line, in a multi-drop scheme, as units are addressed uniquely and only respond, politely, to their own polls and commands.
RTUs, PLCs and DCS are increasingly beginning to overlap in responsibilities, and many vendors sell RTUs with PLC-like features and vice versa. The industry has standardized on the IEC 61131-3 functional block language for creating programs to run on RTUs and PLCs, although nearly all vendors also offer proprietary alternatives and associated development environments.
In addition, some vendors now supply RTUs with comprehensive functionality pre-defined, sometimes with PLC extensions and/or interfaces for configuration.
Some suppliers of RTUs have created simple graphical user interfaces GUI to enable customers to configure their RTUs easily. In some applications dataloggers are used in similar applications.
A programmable automation controller (PAC) is a compact controller that combines the features and capabilities of a PC-based control system with that of a typical PLC. PACs are deployed in SCADA systems to provide RTU and PLC functions. In many electrical substation SCADA applications, "distributed RTUs" use information processors or station computers to communicate with digital protective relays, PACS, and other devices for I/O, and communicate with the SCADA master in lieu of a traditional RTU.
Architecture
An RTU monitors the field digital and analog parameters and transmits data to the Central Monitoring Station. It contains setup software to connect data input streams to data output streams, define communication protocols, and troubleshoot installation problems.An RTU may consist of one complex circuit card consisting of various sections needed to do a custom fitted function or may consist of many circuit cards including CPU or processing with communications interface(s), and one or more of the following: (AI) analog input, (DI) digital input, (DO/CO) digital or control (relay) output, or (AO) analog output card(s).
Power supply
A form of power supply will be included for operation from the AC mains for various CPU, status wetting voltages and other interface cards. This may consist of DC to DC converters where operated from a station battery system.RTUs may include a battery and charger circuitry to continue operation in event of AC power failure for critical applications where a station battery is not available.
Digital or status inputs
Most RTUs incorporate an input section or input status cards to acquire two state real world information. This is usually accomplished by using an isolated voltage or current source to sense the position of a remote contact (open or closed) at the RTU site. This contact position may represent many different devices, including electrical breakers, liquid valve positions, alarm conditions, and mechanical positions of devices.Analog inputs
An RTU can monitor analog inputs of different types including 0-1 mA, 4–20 mA current loop, 0–10 V., ±2.5 V, ±5.0 V etc. Many RTU inputs buffer larger quantities via transducers to convert and isolate real world quantities from sensitive RTU input levels. An RTU can also receive analog data via a communication system from a master or IED sending data values to it.The RTU or host system translates and scales this raw data into the appropriate units such as gallons of water left, temperature degrees, or Megawatts, before presenting the data to the user via the HMI.
Digital (control) outputs
RTUs may drive high current capacity relays to a digital output (or "DO") board to switch power on and off to devices in the field. The DO board switches voltage to the coil in the relay, which closes the high current contacts, which completes the power circuit to the device.RTU outputs may also consist of driving a sensitive logic input on an electronic PLC, or other electronic device using a sensitive 5 V input.
Analog outputs
While not as commonly used, analog outputs may be included to control devices that require varying quantities, such as graphic recording instruments (strip charts). Summed or massaged data quantities may be generated in a master SCADA system and output for display locally or remotely, wherever needed.Software and logic control
Modern RTUs are usually capable of executing simple programs autonomously without involving the host computers of the DCS or SCADA system to simplify deployment, and to provide redundancy for safety reasons. An RTU in a modern water management system will typically have code to modify its behavior when physical override switches on the RTU are toggled during maintenance by maintenance personnel. This is done for safety reasons; a miscommunication between the system operators and the maintenance personnel could cause system operators to mistakenly enable power to a water pump when it is being replaced, for example.Communications
An RTU may be interfaced to multiple master stations and IEDs with different communication media (usually serial (RS232, RS485, RS422) or Ethernet). An RTU may support standard protocols (Modbus, IEC 60870-5-101/103/104, DNP3, IEC 60870-6-ICCP, IEC 61850 etc.) to interface any third party software.Data transfer may be initiated from either end using various techniques to insure synchronisation with a mimimal data traffic. The master may poll its subordinate unit (Master to RTU or the RTU poll an IED) for changes of data on a periodic basis. Analog value changes will usually only be reported only on changes outside a set limit from the last transmitted value. Digital (status) values observe a similar technique and only transmit groups (bytes) when one included point (bit) changes. Another method used is where a subordinate unit initiates an update of data upon a perdetermined change in analog of digital data. Periodic complete data transmission must be used periodically, with either method, to insure full synchronisation and eliminate stale data. Most communication protocols support both methods, programmable by the installer.
Multiple RTUs or multiple IEDs may share a communications line, in a multi-drop scheme, as units are addressed uniquely and only respond, politely, to their own polls and commands.
IED communications
IED communications transfer data between the RTU and an IED (Intelligent End Device) . This can eliminate the need for many hardware status inputs, analog inputs, and relay outputs in the RTU. Communications are accomplished by copper or fibre optics lines. Multiple units may share communication lines.Master communications
Master communications are usually to a larger control system in a control room or a data collecion system incorporated into a larger system. Data may be moved using a copper, fibre optic or radio frequency communication system. Multiple units may share communication lines.Comparison with other control systems
RTUs differ from programmable logic controllers (PLCs) in that RTUs are more suitable for wide geographical telemetry, often using wireless communications, while PLCs are more suitable for local area control (plants, production lines, etc.) where the system utilizes physical media for control. The IEC 61131 programming tool is more popular for use with PLCs, while RTUs often use proprietary programming tools.RTUs, PLCs and DCS are increasingly beginning to overlap in responsibilities, and many vendors sell RTUs with PLC-like features and vice versa. The industry has standardized on the IEC 61131-3 functional block language for creating programs to run on RTUs and PLCs, although nearly all vendors also offer proprietary alternatives and associated development environments.
In addition, some vendors now supply RTUs with comprehensive functionality pre-defined, sometimes with PLC extensions and/or interfaces for configuration.
Some suppliers of RTUs have created simple graphical user interfaces GUI to enable customers to configure their RTUs easily. In some applications dataloggers are used in similar applications.
A programmable automation controller (PAC) is a compact controller that combines the features and capabilities of a PC-based control system with that of a typical PLC. PACs are deployed in SCADA systems to provide RTU and PLC functions. In many electrical substation SCADA applications, "distributed RTUs" use information processors or station computers to communicate with digital protective relays, PACS, and other devices for I/O, and communicate with the SCADA master in lieu of a traditional RTU.
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