MVP 2021 Flex727 Posted June 15, 2011 MVP 2021 Report Share Posted June 15, 2011 I'm learning networking as fast as I can, but it's still a confusing subject for me. I've been able to successfully network 2 PLCs using MODBUS IP over ethernet, but now I need to add a third and can't seem to get it to work. Although I have a basic understanding of ports and sockets, I can't find the right combination to get everything talking. Can someone fill in the blanks with the proper or suggested values for each? Each PLC also needs to be able to communicate with a PC. PLC1 Master PLC2 Slave0 PLC3 Slave1 PC IP Address 192.168.1.101 192.168.1.102 192.168.1.103 192.168.1.100 Init Socket (PLC comm) Socket # ? Socket # ? Socket # ? Port # ? Port # ? Port # ? Init Socket (PC comm) Socket 1 Socket 1 Socket 1 Port #? Port # ? Port # ? I get confused about whether the Socket # and Port # needs to be the same on each end of the communications path or must be different. Likewise whether the Socket # and Port # needs to be different between the two slave PLCs. Thanks for your help. Quote Link to comment Share on other sites More sharing options...
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