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Listening profibus on PA side for maintenance purpose

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ipupkin

Industrial
Dec 24, 2002
26
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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