Modbus Communication in CI853 and one Modbus Slave.
We are facing issue in Modbus Communication in one of the project site. Flow of Signal is
Seimen PLC -- Modbus TCP Output -- tGW-718 Gateway --> Modbus RS485 output ---> TCC80 Converter -- RS232 Output -- CI853.
The distance between two devices is 150 meter(approximately). The data from Seimens PLC is coming till the output of TCC80 Converter(Moxa make). The same has been checked through U-port of Moxa with laptop. But data is not coming in control Builder M through CI853.
Also when one slave is simulated through same set of TCC80 converter and cable, data is coming in CI853 and we can see it in control builder M.
We checked the voltage before TCC80 converter at RS485 line and its around 1.1 V DC.
we tried by placing resistors in modbus segment start and end, but still issue remains the same.
What could be the reason for data not coming in PLC but coming in MOdbsacn software.
This question has not yet been answered.