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Tuesday, August 21, 2018
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Experion Modbus TCP/IP Scaling
Looking for a way to scale Modbus holding/input registers using the PCDI numeric array blocks.

I'm using PCDI blocks to communicate with several PLCs over Modbus TCP/IP. I am looking for the best way to scale holding/input registers. The numeric array blocks have range scaling, but it doesn't do what I expect. In my experience, you'll get a raw value that needs to be multiplied by some factor to get your EGU value. I could add a multiply block on the PV outlet, but would rather do it all in the PCDINUMARRCH block.

Please advise.