09.03.2021, 06:49
Do you mean that you want to capture Modbus TCP communication between other master and slave devices? It's not possible to do this directly. One solution is to temporarily disconnect one of slaves and place LM with the same IP as the slave instead. Another solution is to use Wireshark for capturing but for this you will either need a PC with two network interfaces so all traffic goes through it or you need an Ethernet hub (not a switch) which passes all traffic to all ports.