Configuring Dp/Pa Link - Siemens SIMATIC PCS 7 Function Manual

Advantages of fault-tolerant components
4.4 Distributed I/O
Additional information
● Manual
4.4.6

Configuring DP/PA Link

Functionality
When connecting a redundant PROFIBUS DP, the DP/PA Link consists of two IM 153-2
interface modules and one or more DP/PA couplers. The DP/PA coupler is used to build a
gateway between a redundant PROFIBUS DP subnet and a non-redundant PROFIBUS PA
subnet. When configuring in HW Config in SIMATIC Manager, you can only select the IM 153-2
interface modules and not the DP/PA coupler.
The DP/PA coupler is transparent in regard to addressing and communication. It does not have
its own bus address or diagnostic address; it simply forwards message frames. The field
devices connected to the PROFIBUS PA are addressed directly from the automation device.
The DP/PA coupler can be reconfigured in runtime but it cannot be replaced.
Note
You can find a list of PA slaves that can be connected in the manual
DP/PA Link and Y Link . Note that PCS 7 driver blocks are not available for all of the devices
listed. Contact the PCS 7 Support Center to check if such a driver block is available for the
device you have selected.
Requirements
● The PCS 7 project with a SIMATIC H station is open in SIMATIC Manager.
● A redundant DP master system is configured for the SIMATIC H station in HW Config.
Example configuration
The following figure shows how the DP/PA Link is used.
122
DP/ PA Link and Y Link Bus Couplings
SIMATIC Bus Couplers;
Fault-tolerant Process Control Systems (V8.0)
Function Manual, 03/2012, A5E02779471-02