Thank you!

Hello,

AutoGen_3802641

Hello everyone,

I am facing the following issue:

I have a Siemens Reyrolle IED configured as a Modbus server and an S7-1500 as the client. I need to read some analog values such as voltage, current, and power on my PLC. The Modbus TCP communication has been established, and I can successfully read the first value from address 30180 (the Modbus address in the Reyrolle relay). However, when I increase the number of registers to read (MB_Data_Len > 1), I do not receive any data in my array.

Does anyone have any suggestions to help me resolve this?

Thank you!

it is recommended as every time to do some tests with some MB TCP app on PC to be sure that data are comming correctly from Server. You can also check how are registers designed and what is most important - what data type are used. Depending to this information you can set correct LEN, with WORD (LEN=1) or DWORD (LEN=2) defined register. It is expected to have correct and enough long recv buffer at your PLC, output parameter ERROR and STATUS can indicate cause of problem, generally wrong register address or wrong used LEN depended to data type used on Server's register type.