Sepam S40 Modbus communication Issue

[Fajar_Santoso]

Dear Gents,

I have a communication problem. I am using PLC M580 and connecting every SEPAM using the Modbus protocol that is connected to the NOM 0200.2 Module. One line consists of 10 SEPAMs, and right now, we have a problem only with the 2 SEPAMs, both of them using S40 Models and the rest using S20 and M20 Series. I already check the communication line by using another SEPAM on the same line. I am making sure the line was okay and the interface 485 ACE 949-2 was good.

Not only that, but I have problem when try to scan the Modbus frame from the SEPAM. Furthermore, I cannot get the correct value and I only get 0 for every function with response ok.

I try to troubleshoot using the management tools that come on the READ_VAR Function Block. But the result of the code is quite strange, See attachment. Can anyone help me find which one is the problem: the SEPAM or the Address on the PLC?

Thank you for your assistance and time.

Regards,

Fajar Santoso