Siemens Simatic S7-1500R - Page 117

Redundancy scenario
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① Primary CPU
② Backup CPU
③ Two fiber-optic cables (redundancy connections)
④ PROFINET cables (PROFINET ring 1)
⑤ PROFINET cables (PROFINET ring 2)
⑥ IO device ET 200SPHA
⑦ ET 200SP HA interface module → failed
⑧ IO device ET 200SP
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.
117
Application planning
5.4 Redundancy scenarios
S7-1500R/H redundant system
System Manual, 11/2022, A5E41814787-AD