Dear All,

We are having problem communication between LG PLC (Model K7M-DR60U) and DCS (Foxboro) via Modbus protocol. The LG PLC has a built-in communication port (RS-485) which is connected to RS485/422 to FO converter (MOXA product), and then goes to DCS (Foxboro). We already tested it using Modbus Tester and it looks good, but after they're connected to DCS, they can not receive data or anything. So, can anybody help us to solve this problem? Please send to my e-mail suharto_86 at cbn. net. id

 

Hi there,

You did not mention anything about termination resistors, have you installed them on the first and last node of your network? If not, do so. The resistors should match the impedance of the cable used.

Good luck.

/Pat@HMS