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Does Schneider have offer for DP/PA Coupler that can be used with PRM module.

As of now Schneider Electric do not have DP/PA coupler in there product basket. With PRM you may use Segment Coupler (SK3) from P&F. Refer to the below links for more details
http://www.pepperl-fuchs.us/usa/en/
http://www.pepperl-fuchs.us/usa/en/classid_1482.htm?view=productdetails&prodid=28138

All types of couplers are supported:
• Segment coupler
• Gateway-type segment coupler
• DP/PA link

Gateway-type segment couplers are recommended:
• transparency on a software configuration point of view: PA devices are seen as DP devices
• No restriction on PROFIBUS PA data volume
• Support of PROFIBUS DP high transfer rates

Any third party standard DP/ PA coupler should work, as per TVDA documnet referance of P&F used & tested. You may explore on website for any other such products.