Siemens SIMATIC PCS 7 Function Manual page 73

Configuration
Functionality
The DP/PA Coupler is a transceiver that interconnects PROFIBUS DP and PROFIBUS PA
and decouples the various transmission rates. It is a slave on the PROFIBUS DP and a master
on the PROFIBUS PA. Seen from the automation system, the DP/PA Link is a modular slave.
The individual modules of this slave are the field devices that are connected to the lower-level
PROFIBUS PA lines.
The PA devices connected to the PROFIBUS PA are assembled at a PROFIBUS address by
DP/PA Link.
The DP/PA link can be connected directly to the PROFIBUS DP interface of programmable
controllers (S7 400) for the coupling between PROFIBUS DP and PROFIBUS PA.
Versions
You can connect a PROFIBUS PA to the PROFIBUS DP. The following variants can be
realized:
● Connection to a singular PROFIBUS DP
– Connection via DP/PA Link (1 x interface module, 1 x DP/PA coupler)
– Connection via DP/PA coupler (45.45 Kbps on PROFIBUS DP)
– Connecting a redundant PROFIBUS PA:
● Connection to a redundant PROFIBUS DP
– Connection of a singular PROFIBUS PA via DP/PA Link with redundant interconnection
– Connecting a redundant PROFIBUS PA:
Fault-tolerant Process Control Systems (V8.1)
Function Manual, 11/2014, A5E34878832-AA
You can find additional information on this in the section "Fault-tolerant PROFIBUS PA
(Page 74)".
(2 x interface module and 1 x DP/PA coupler)
You can find additional information on this in the section "Fault-tolerant PROFIBUS PA
(Page 74)".
Fault-tolerant Solutions in PCS 7
3.3 Solutions for communication
73