Siemens Simatic PCS 7 Function Manual page 131

Setting redundant mode at the bus link
The redundant mode set at the bus link has to match the configured redundant mode.
FF Link - Setting at coupler FDC 157-0 (DIP switch bit 7) or Compact FF Link - Setting at
Compact FF Link (DIP switch "RING" ):
● OFF: Coupler redundancy or non-redundant configuration
● ON: Ring redundancy
Note
Configuration
If there is a discrepancy between the set redundancy mode and the configured redundancy
mode, a diagnostic message is generated.
Bus link with FOUNDATION Fieldbus: Create FF subsystem
1. In the component view, select the SIMATIC station and double-click the "Hardware" object
in the detail window.
HW Config opens.
2. If the hardware catalog is not visible, select the View > Catalog menu command.
The hardware catalog opens.
3. Open the PROFIBUS DP > FF Link folder in the current PCS 7 profile.
4. Drag-and-drop the module to be used as a bus link on PROFIBUS DP onto the PROFIBUS
DP master system:
– IM 153-2 FF (for FF Link)
– IM 655-5 FF (for Compact FF Link)
5. Enter the node address for the PROFIBUS DP in the "Parameters" tab of the Properties
dialog.
A free address is suggested by the system.
Note
"Configuration via PDM" option
You configure the bus link and the FF devices using SIMATIC PDM in PCS 7. If the
"Configuration with PDM" option is selected, you can open SIMATIC PDM by double-
clicking the bus link.
High Availability Process Control Systems (V9.0)
Function Manual, 05/2017, A5E39221836-AA
Advantages of high availability components
5.3 Communications connections
131