Application planning
3.4 Redundancy scenarios
S7-1500R/H redundant system
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System Manual, 10/2018, A5E41814787-AA
3.4.3
Failure of the backup CPU
Introduction
The following redundancy scenario describes the effects of a defective backup CPU.
Redundancy scenario
①
Primary CPU
②
Backup CPU → failed
③
PROFINET cable (redundancy connections, PROFINET ring)
④
IO device ET 200MP
⑤
IO device ET 200SP
Figure 3-8
Failure of the backup CPU (using S7-1500R as an example)
Sequence of events
1.
The backup CPU of the redundant system fails in the RUN-Redundant system state.
2.
The redundant system switches to the RUN-Solo system state. You can find additional
information on the RUN-Solo system state in the section Operating and system states
(Page 197).
3.
The primary CPU continues to exchange process data with the IO devices.
4.
The redundancy of the system is restricted. The restriction has no impact on the process.
If another system component or another network segment fails, this can result in the
failure of the S7-1500R/H redundant system. You can find additional information in the
section Failure scenarios (Page 72).
Содержание Simatic S7-1500H
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