Siemens Simatic PCS 7 Function Manual page 149

Functionality
The field devices connected to the FF segment are addressed directly from the PLC.
In PCS 7 there are the following possibilities for the installation of a bus link when connecting
to a redundant PROFIBUS DP:
● FF Link
The coupler FDC 157-0 is not displayed for addressing and communication. It does not
have its own bus address and simply forwards message frames.
● Compact FF Link
A coupler for the FF segment is integrated in the Compact FF Link (Field Device Koppler).
The redundant bus link can be re-configured and replaced during operation.
Note
Please note that PCS 7 driver blocks are not available for all of the devices listed. Contact the
PCS 7 Support Center to determine if 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.
● SIMATIC PDM V8.0 SP1 or higher
Example configuration
The following figure shows how the FF Link is used:
High Availability Process Control Systems (V9.0)
Function Manual, 05/2017, A5E39221836-AA
Advantages of high availability components
5.4 Distributed I/O
149