Siemens Simatic PCS 7 Function Manual page 82

High availability solutions in PCS 7
4.3 Solutions for communication
Configuration
Functionality
The DP/PA coupler connects 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 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
PA Link.
The 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 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 PA Link with redundant interconnection
– Connecting a redundant PROFIBUS PA:
82
You can find additional information on this in section "High availability PROFIBUS PA
(Page 83)".
(2 x interface module and 1 x DP/PA coupler)
You can find additional information on this in section "High availability PROFIBUS PA
(Page 83)".
High Availability Process Control Systems (V9.0)
Function Manual, 05/2017, A5E39221836-AA