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I understand S7 PLCs do not support I/Os of S5 PLCs. Hence I intend to use an S7 CPU to only communicate with S5 CPU. While S5 CPU will only communicate with I/Os, S7 PLC will hold the program and process the I/Os fetched from S5 CPU. But I want to know what are all the options available to me. Can anyone suggest, as I have to take a decision on this matter shortly.