Hello,

    I have 2 PLCs having CPU S7-315C and CPU S7-317C. The S7-317C  PLC comes with system in which we are not able to change program.  I would like to read/write IOs from S7-317C  to S7-315C without changing any program in S7-317C.

Presently S7-317C can be read/write from SCADA.

Please suggest me how to read/write IOs & DB without changing any thing on S7-327C.

Thank you

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Split from Communication between two S7-300 .