Comments (1)
Generally, PLCs use the EtherNet/IP CIP "Implicit" or "Connected" requests via UDP/IP for real-time communication within the factory-floor LAN. The cpppo API doesn't implement this part of the protocol. It implements the TCP/IP "Unconnected" or "Explicit" request/response part of the protocol. This is generally the one used by computers that interact with PLCs (quite often from outside the factory-floor LAN).
So, usually it is necessary to "poll" a PLC, to get updates on its values, in a Python program. We can't have the PLC spontaneously send its updated values to the Python 'cpppo' program using "Connected" messages.
Hope that helps!
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