Siemens SIMATIC S7-1500 System Manual page 117

Redundancy scenario
①
②
③
④
⑤
⑥
⑦
⑧
Figure 5-31 Failure of an interface module in an R1 device in the PROFINET ring
Sequence of events
1. The left interface module (slot 0) of the R1 device fails in PROFINET ring 1 and interrupts
PROFINET ring 1.
2. The redundant system will remain in the RUN-Redundant system state: The primary and
backup CPUs remain in the RUN-Redundant operating state. The roles of the primary and
backup CPUs do not change.
3. The redundant system selects an alternative connection over the backup CPU and the
PROFINET ring 2. This allows the redundant system to access the R1 device (via the right-
hand interface module at slot 1).
4. The redundancy of the system is restricted. The restriction has no effect on the process. If
another system component fails, the S7-1500R/H redundant system can fail as a result.
S7-1500R/H redundant system
System Manual, 11/2022, A5E41814787-AD
Primary CPU
Backup CPU
Two fiber-optic cables (redundancy connections)
PROFINET cables (PROFINET ring 1)
PROFINET cables (PROFINET ring 2)
IO device ET 200SP HA
ET 200SP HA interface module → failed
IO device ET 200SP
Application planning
5.4 Redundancy scenarios
117