Help with WAGO 750-343

[mbuesch]

Help with WAGO 750-343

[mbuesch]

Thanks for your question.

In general it's not easy to tell why a slave doesn't like a Cfg or Prm telegram.
In your case it doesn't like your Prm telegram. Therefore, there is some option set that your slave doesn't expect or some option is missing that your slave expects. And this includes the user-part of the Prm telegram, that you define in your user code that calls into pyprofibus. In general slaves are very picky about the contents of the Cfg and Prm telegram.

The only real way forward now is to learn about the Prm telegram and its format and then see what's wrong. The actual Prm telegram sent to the device is shown as hex dump in the logs.

[TadyTheFish]

I got it to work
First I pulled the GSD file of a project that the modules were working.
Next it seems I misunderstood the config file comment in section modules.
It says to define the modules that are plugged IN TO THE SLAVE
So for me it was

module_0=750-610  Supply 24 V DC/DIA
module_1=750-430  8 DI/24 V DC/3.0 ms
module_2=750-430  8 DI/24 V DC/3.0 ms
module_3=750-430  8 DI/24 V DC/3.0 ms
module_4=750-430  8 DI/24 V DC/3.0 ms
module_5=750-430  8 DI/24 V DC/3.0 ms
module_6=750-430  8 DI/24 V DC/3.0 ms
module_7=75x-530 8DO/24V DC/0.5A
module_8=75x-530 8DO/24V DC/0.5A
module_9=75x-530 8DO/24V DC/0.5A
module_10=75x-530 8DO/24V DC/0.5A
module_11=75x-530 8DO/24V DC/0.5A
module_12=75x-530 8DO/24V DC/0.5A
module_13=75x-530 8DO/24V DC/0.5A

But in the end I defined also the interface module and it started working
Like this:

module_0=750-343 No PI Channel
module_1=750-610  Supply 24 V DC/DIA
module_2=750-430  8 DI/24 V DC/3.0 ms
module_3=750-430  8 DI/24 V DC/3.0 ms
module_4=750-430  8 DI/24 V DC/3.0 ms
module_5=750-430  8 DI/24 V DC/3.0 ms
module_6=750-430  8 DI/24 V DC/3.0 ms
module_7=750-430  8 DI/24 V DC/3.0 ms
module_8=75x-530 8DO/24V DC/0.5A
module_9=75x-530 8DO/24V DC/0.5A
module_10=75x-530 8DO/24V DC/0.5A
module_11=75x-530 8DO/24V DC/0.5A
module_12=75x-530 8DO/24V DC/0.5A
module_13=75x-530 8DO/24V DC/0.5A
module_14=75x-530 8DO/24V DC/0.5A

Like I said I am a noob regarding profibus and I thought the 750-343 is considered as slave device and not the first module

If you like I can send you the files and you can include them for someone else

[mbuesch]

I'm very sorry for the confusion.

PB slaves are highly individual and therefore the Prm of these devices naturally also are individual.
This is a perfect example of special slave behavior that we can't really predict or prevent in the pyprofibus documentation and configuration.

Thank you very much for sharing your solution to the problem.
This will help other people. :)

If you like, please attach your files to this issue.

[TadyTheFish]

I will just give me a few days so I can obtain a analog input and output module. So I can add them to the configuration to make it easier for other people.

[TadyTheFish]

Hello
Sorry for the delay, I had a busy two weeks :)
Anyway here is a ZIP file containing the .py .conf and .gsd
I hope this helps someone
examples_wago.zip

[mbuesch]

Thanks! :)

[TadyTheFish]

No problem😁