Pcs 7, Step 6: Transition To Redundant System Mode; Response If Monitoring Times Are Exceeded - Siemens SIMATIC S7-400H Manual

Modifying the System During Operation

Response if monitoring times are exceeded

If one of the monitored times exceeds the maximum value configured the update is
interrupted and no change of master takes place. The fault-tolerant system
remains in single mode with the previous master CPU and in certain conditions
attempts to perform the change of master later. For more details refer to
Section 6.3.
11.2.6

PCS 7, Step 6: Transition to Redundant System Mode

Initial situation
The fault-tolerant system works with the new hardware configuration in single
mode.
Procedure
1. In SIMATIC Manager, select a CPU of the fault-tolerant system, and choose the
PLC > Operating Mode menu command.
2. In the Operating Mode dialog box, select the standby CPU and click the
Restart (warm restart) button.
Result
Standby CPU links up again and is updated. The fault-tolerant system works with
the new hardware configuration in redundant system mode.
Behavior of the I/O
Type of I/O One-way I/O of standby
Added I/O modules Are configured and
updated by the CPU.
Driver blocks are not yet
present. Any interrupts
occurring are not reported.
I/O modules that Are
and updated by the CPU.
continue to be
present
Added DP stations as for added I/O modules
(see above)
1) Central modules are additionally first reset. Output modules briefly output 0 during this time (instead of the
configured substitute or holding values).
11-12
One-way I/O of master
CPU
Are updated by the CPU.
Driver blocks are not yet present. Any process or
diagnostics interrupts occurring will be recognized but
not reported.
1)
re-parameterized Continue to work without interruption.
Driver blocks are not yet present. Any interrupts
occurring are not reported.
CPU
Automation System S7-400H Fault-tolerant Systems
Switched I/O
A5E00068197-07