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Listening profibus on PA side for maintenance purpose

Listening profibus on PA side for maintenance purpose

Listening profibus on PA side for maintenance purpose

(OP)
Listening profibus on PA side for maintenance purpose - is it possible?

We've got Siemens S5-155 PLC (CPU948) with IM-308C serving number of profibus PA devices. There are 12 DP/PA couplers connected all to the same DP cable from IM308-C.

To reduce load on existing IM-308C, I'm going to add another one into rack and connect last 4 DP/PA couplers to it. In result, old IM-308C will serve devices connected via 8 of total 12 couplers, and new IM-308C will serve remaining devices connected via remaining 4 couplers.

My problem is that I have no information about which device belongs to which coupler (PA segment), and this is extremely difficult to search physically. The only alternative way I know is to disconnect DP side from a coupler (one by one), connect DP plug of PG and use "Commuwin II" (Endress+Hauser software tool) to see list of devices on the particular PA segment. But this is intrusive way which will interrupt plant operation.

Question is:

Under conditions described in the 1st and 2nd paragraphs, how can I build the list of PA devices on each PA segment without interrupting their communication with PLC? Can I listen somehow on PA side?

Sorry for long description.

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