Siemens SIMATIC PCS 7 - Configuring a Bus Link for PROFIBUS PA

5.4.7 Configuring a bus link for PROFIBUS PA
Bus links are gateways between bus systems and enable the communication connection of
the bus systems.
The DP/PA Link is a bus link for communications between PROFIBUS DP and PROFIBUS
PA.
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 SIMATIC Bus Couplers;
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.
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Advantages of high availability components
5.4 Distributed I/O
High Availability Process Control Systems (V9.0)
Function Manual, 05/2017, A5E39221836-AA 147