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Communication driver for M580 Hotstandby Controller and AVEVA plant scada integration..

Hemant

Hello All,

For our new project configurations, we had M580 redundant controllers (H58-4040) with AVEVA plant scada 2023 (citect) with redudant servers.

For M580 integration we had two drivers - 

 

From these, is MODBUS/TCP is stable?  as we do not want to add one more software product OFS in configuration.

Or we should go with OFSOPC for more reliable and fault free operations post commissioning. Overall we may have 10,000 tags on SCADA.

Please advise.

Warm regards

Hemant

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  • Hi  ,

    The "Modbus/TCP (Ethernet)" option uses the MODNET driver in Plant SCADA. This is basically Modbus on TCP and has packet request sizes of 255 bytes of data payload. 

    The OFSOPC driver communicates with OFS via OPC, and the OFS communicates with the PLC using the UMAS protocol (think of it as an advanced proprietry Modbus protocol). It has a payload of 1024 (about 4x standard modbus). It also supports tagname as the address (you just name it and don't need to use a Modbus address or %MW address).

    If you want the fastest startup / connection time, the MODNET protocol is better. If you want a large data throughput (high volume of data polled) and ease of configuration (tagnamed addressing) then OFSOPC might be the better fit.

    If it was me, and I knew I would be polling 10,000 tags, I would go with OFS / OFSOPC.

    Kind regards

    Olivier

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  • Hi  ,

    The "Modbus/TCP (Ethernet)" option uses the MODNET driver in Plant SCADA. This is basically Modbus on TCP and has packet request sizes of 255 bytes of data payload. 

    The OFSOPC driver communicates with OFS via OPC, and the OFS communicates with the PLC using the UMAS protocol (think of it as an advanced proprietry Modbus protocol). It has a payload of 1024 (about 4x standard modbus). It also supports tagname as the address (you just name it and don't need to use a Modbus address or %MW address).

    If you want the fastest startup / connection time, the MODNET protocol is better. If you want a large data throughput (high volume of data polled) and ease of configuration (tagnamed addressing) then OFSOPC might be the better fit.

    If it was me, and I knew I would be polling 10,000 tags, I would go with OFS / OFSOPC.

    Kind regards

    Olivier

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