Why Use Gateway RTU in Remote SCADA View


The very important function of a Gateway RTU in our remote SCADA viewing is to compress a lot of diversified field signals into a single communication means- long distance cable channel or radio.

It provides a more real time controller for remote units/equipments which involve time/mission critical data transmission tasks. SCADA is normally classified as non-real time control system and is just a supervisory system.

Also, the TeleSCADA are normally indeterministic and involve comparably long latency time delays and communication channel instability.

Having an RTU host a complete stand alone program will keep remote monitoring functioning safely, adequately, and reliably even if it lost links.

In a distrbuted system, nodes are created throghout the network so as to cater the fault in communication links. For such a system, the RTU is responsible to collect data from field devices or itself and store it till it is allowed to transfer the same towards the master station.

To further clarify the above, field information like status and values or command data request needs the RTU to be there to translate what is received through a SCADA protocol (DNP3,IEC101/104 ….) and converts it to physical reality information. RTU therefore is mainly a “translator” of protocol language into Field language and vice versa. This is especially important to make long distance data highway fast and reliable.

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