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Is it possible to have MODBUS TCP (Ethernet) via the CPU Ethernet?   

I have two separate networks I'm using.  My PLC needs to get data from a DCS via MODBUS on a 172.17.100.xxx network and a computer needs to get the MODBUS data from the Unitronics PLC via a 172.16.100.xxx network.  Can I do this or do I need to find another solution?

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  • 1 month later...

You may be able to do this by changing the subnet of the PLC, DCS and computer to be 255.0.0.0. But most people with a concern for cybersecurity would say do not do this. A gateway or router would be required to do this to maintain some integrity of the other networks.

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