Siemens SIMATIC S7-1500 Function Manual page 115

Diagnostics of the S7-1500R/H redundant system
7.4 Diagnostics in the RUN-Redundant system state
Diagnostics in STEP 7
The diagnostics buffer of the CPU displays:
● that there is only one redundancy connection
● which synchronization module has failed on which CPU
The diagnostics in the project tree shows:
● Maintenance demanded in lower-level component in the S7-1500H system
● Maintenance demanded in lower-level components of PLC_1 and PLC_2
● Maintenance demanded in lower-level components of local modules of PLC_1 and PLC_2
The diagnostics in the network view displays:
● Errors for the Synchronisationsmodul_1 of the Synchronisationsschnittstelle_2 of PLC_1
● Synchronisationsmodul_1 of Synchronisationsschnittstelle_1 of PLC_2 not reachable
Figure 7-13 Diagnostics example: RUN-Redundant system state, a synchronization module fails
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Function Manual, 11/2019, A5E03735838-AF
Diagnostics