Posted 28 Feb 2016 Hi i am trying to connect to omron plc (cj2m ) from my pc using modbus tcp/ip in c# , by using the port 502 i get an error saying that the port can't be reached is there any method to fix that or change the port number ? thank you Share this post Link to post Share on other sites
Posted 29 Feb 2016 The PLC does not talk Modbus/TCP. It talks Ethernet/IP. Share this post Link to post Share on other sites