Help: Beckhoff profibus master FC3121 with Siemens CP342-5 slave

hosplc said:

Attached is the config file.

Click to expand...

In your config there is no swap. Please check the related box it might work.

It has been checked, and looks to be solved, but this was not the whole story.
I'm waiting for info from the field about a thorough test results.
Thanks.

[Solved]
I owe everyone a deep and sincere apology.

Let me try to make the story short:
From the beginning, due to security reasons, I wasn't allowed to access the PLCs (which are several thousand miles away) remotely.
I was allowed only remote access to the PC in which TwinCAT is running.
Any modification I would need to do with any of the PLCs, I had to send it to a person in the field to apply it, then I would investigate the results in TC.

Due to the erroneous data received by TC, I suggested modifying one of the PLCs to send known-fixed values, hoping that I can locate these values in the PFB card memory (suspecting wrong or shifted addresses).
After getting the OK that the modification was implemented, TC was still showing erroneous values... Here I posted my original msg.
With the lack of new ideas, I insisted on accessing the PLCs myself...Finally, I got the OK.

Just a few minutes after access, I found that my modification was wrongly applied: instead of copying blocks from one project to another, they edited the existing blocks with code from the original blocks (not the modified ones). So, I was under a "wrong" impression that the values are fixed in the PLC while they are changing in TC.
After correcting this mistake, TC shows the known-fixed values as they are but bytes-reversed.
Applying "byte-swapping" function (thanks to everyone points this out), TC and the linked software show the data correctly.

Please accept my apology and I'm really thankful to everyone tried to help.
Hos

[PS: How to mark the original post as "Solved". I can't even see the "Edit" icon which FAQ talks about]