Application planning
3.5 Failure scenarios
S7-1500R/H redundant system
System Manual, 10/2018, A5E41814787-AA
81
Solution
Please note the following solution:
Note
Before you replace the defective PROFINET cables, you must switch both R-CPUs to the
STOP operating state. Only then repair the PROFINET cables in the PROFINET ring.
Afterwards, switch the R-CPUs back to the RUN operating state.
You can find additional information on the procedure in the section Replacing defective
redundancy connections (Page 261).
3.5.3.3
Failure of the primary CPU when IO devices have failed in the PROFINET ring
Introduction
The following failure scenario describes the effects of a defective IO device in the
PROFINET ring and a defective primary CPU.
Failure scenario
①
Primary
CPU → failed (2nd failure in runtime sequence)
②
Backup CPU → switches to STOP operating state
③
PROFINET cable (redundancy connections, PROFINET ring)
④
IO device ET 200MP
⑤
IO device ET 200SP → failed (1st failure in sequence)
Figure 3-18 Failure of an IO device in the PROFINET ring and the primary CPU (using S7-1500R as
an example)
Summary of Contents for Simatic S7-1500H
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