Siemens - Wago modbus tcp

SIMATIC S7-200/300/400, Step7, PCS7, CFC, SFC, PDM, PLCSIM,
SCL, Graph, SPS-VISU S5/S7, IBHsoftec, LOGO ...
Post Reply
lapgoch
Posts: 2
Joined: Wed Nov 23, 2022 7:15 am

Siemens - Wago modbus tcp

Post by lapgoch » Mon Nov 28, 2022 8:28 am

Hi.

I am struggling with modbus tcp between a wago 750-842 and a siemens 1214c.
My understanding is that the 750-842 defaults to a modbus server with no application program loaded.
The 1214C has MB_client configured to read the 750-842 holding registers.
But it doesn't read anything , no errors but a status 7002 ( waiting for server response )
I am using Codesys v2.3 and TIA v12 to program the devices.
Attached are pics of the 750-842 and 1214C configuration.
What am I doing wrong?

Image
Image
Image

sania
Site Admin
Posts: 1371
Joined: Sat Aug 13, 2005 6:15 am
Contact:

Re: Siemens - Wago modbus tcp

Post by sania » Tue Nov 29, 2022 6:31 am

1.Par. REQ should be 1 upto receive error or done
2. Client should be active (line 6)
3. that is target ip & port numb in wago? is it for local or remote cpu?
why in 1200 no same settings?

Post Reply