Siemens Simatic PCS 7 Function Manual page 129

You can find configuration variants in the section "High availability PROFIBUS PA (Page 83)".
Requirements
● The PCS 7 project with a SIMATIC H station is open in SIMATIC Manager.
● Two DP master systems are configured for the SIMATIC H station in HW Config and these
are used as connection paths for the redundant interface.
● For commissioning: The PROFIBUS addresses are set with the DIL switches on the
FDC 157-0 DP/PA couplers.
● You can install a maximum of 5 FDC 157-0 DP/PA couplers, one coupler pair of which is
used at the end of the configuration in redundant mode.
Hardware setting on the DP/PA coupler
Note
The redundancy mode set on the DP/PA coupler (DIL switch bit 7) must match the configured
redundancy mode:
● OFF: coupler redundancy (default setting)
● ON: ring redundancy (line redundancy)
If there is a discrepancy between the set redundancy mode and the configured redundancy
mode, a diagnostic message is generated.
Procedure
1. In the component view, select the SIMATIC H 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. In the current PCS 7 profile, double-click "PROFIBUS DP" and then "DP/PA Link".
4. Select the FDC 157-0 DP/PA coupler and drag it onto one of the two PROFIBUS DP lines.
5. Select shortcut menu command Object Properties.
The "Properties - DP Slave" dialog box opens.
6. Click "PROFIBUS".
7. Enter the PROFIBUS address (PROFIBUS DP) in the "Properties - PROFIBUS Interface
FDC 157-0" dialog box and click "OK".
The "Properties - PROFIBUS" dialog box opens.
8. Open the "Network Settings" tab.
9. Select the "User-defined" item in the "Profile" list.
10.Click "Bus parameters...".
11.Ensure the value 3 is set for the "Retry Limit" parameter.
High Availability Process Control Systems (V9.0)
Function Manual, 05/2017, A5E39221836-AA
Advantages of high availability components
5.3 Communications connections
129