Modbus Wago 750-362 with S7-1200

CODESYS
1

Hi there guys,
I have a problem with connecting S7-1200 with Wago DI 750-362. I got connection status 7004, but there is no reaction on the coils in TIAPortal. I will drop some screenshots, if anybody can help me and point what i did wrong, thanks in advantage.

siemens 1
siemens 1763×554 48.4 KB

2

Hi,

Some general recommendations.

  1. Use the Siemens help and find the meaning of the status-codes. 7004 means it is idle - not transmitting or receiving. Status should alternate between different codes. You may see 7005 sometimes if it is sending, and you should see 7006 if data is received. This is taken from TIA v13 (old) that I have available:

    image
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  2. Use simulation-software as both Client (i.e. QModmaster) and server (i.e. ModRSsim2) to test each device independently. Use the Client to make sure you can read the address and range you wish fro the 750-362-unit, and use the Server to check that the PLC tries to connect.

  3. Wireshark can be a handy tool with the modbus-filter active to see requests and responses.

3

Try to set REQ to constant True isntead of the clock. I believe REQ input is level not edge controlled.