For a couple of recent projects I needed to transfer a few bytes between Siemens PLCs. I had used PUTs and GETs in the past, which I find very useful for sending large amounts of data. But if I only need to send a few bytes or speed is critical, setting up one of the PLCs as slave to the other PLC can be more efficient. Siemens makes this quick to do with I-Device, and I’ll show a couple of examples below.
S7-300 PLCs and Profibus, Both PLCs In The Same TIA Portal Project
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