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You can usé the MBUSINIT instructión either to initiaté or to changé the Modbus cómmunications parameters.

Insert the MBUSlNIT instruction in yóur program and éxecute the MBUSINIT instructión for one scán only. If you seIect your S7200 as master, then you can read the signals from PDMS and you can write the signals to PDMS. I found a tool here in the forums for testing the modbus communications, but its for OPEN MODBUS TCP Communication via CP343-1 and CP443-1, is it adifferent protocol, can I use it with S7-200 CPU 224xp.

Memory locations (regesters I use them in my control and I must inform the PDMS about them).Īny one can help me with that, Does any one have sample programs using the modbus can share it.