We try to estabilsh a communication between an S7-1200 and an LemmensP TAC5 with modbusmodule.

We haven't any error but also no data.

See video with status code modification detailed in attachment

Tks in avance for your support 

Hello,

from your STATUS values what I've noticed, all looks ok to me. You have connection established and more SEND/RECV executed. I recommend some kind of MB Sim now, you need set some values to it's addresses depended to your requests. You can also make one simple logical test, set in your first element in recv buffer some value before making test. After execution of MB_CLIENT (REQ=true) you can see if your value will be overwrite with expected 0. If yes, your communication works and at your requested address of Server is 0 value. Other recommendation can be again carefully think about your conditions for REQ (execution) of Client.

Other recommendation can be check documentation of real Device and it's addresses what it has available with respected data type. You can also make tests with some MB TCP Sim Client and connect to your device without PLC now, you can better test available addresses and values.

Also some other important hint as everytime,

you can also save via ERROR condtion some STATUS value in time of specific ERROR. This can be good step to investigation...