Sometimes we need to send “running” or “stopped” status from one machine to another. In other cases, we need data about the shop air pressure or flow rate from the compressor control system used as a variable into our control logic of our machine. Other times it might just be more convenient to wire a new sensor or output device to a PLC that is physically located closer to the end device than the PLC that will actually be using that IO for logic in a program.
This is a companion discussion topic for the original entry at https://www.solisplc.com/tutorials/sending-data-from-a-micrologix-or-slc-plc-to-a-compactlogix-plc-using-the-msg-instruction