Operate PID loop in PLC5 via Modbus from Honeywell DCS

Y

Thread Starter

YuS

Just got such request from Customer.

For now we have standalone package (Heater Control) with 3 PID loops implemented in A-B PLC5 and most critical data transmitted to HPM via Modbus for alarming/archiving purposes.

I guess 2 more registers (Setpoint & Output) and 1 coil (Mode) can be configured to write new values from DCS to PLC... so how complicatated would be PLC logic changes? Any potential problems? Did somebody tried that scenario before?

Thanks,
Yuri
 
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