System modifications during operation
17.3 Adding components in PCS 7
S7-400H
System Manual, 03/2012, A5E00267695-11
291
17.3.6 PCS 7, step 6: Transition to redundant system mode
Starting situation
The fault-tolerant system is operating with the new hardware configuration in single mode.
Procedure
1. In SIMATIC Manager, select a CPU of the fault-tolerant system, then choose "PLC >
Operating Mode" from the menu.
2. From the "Operating Mode" dialog box, select the reserve CPU, then click "Warm
Restart".
Result
The reserve CPU links up and is updated. The fault-tolerant system is operating with the new
hardware configuration in redundant system mode.
Reaction of the I/O
Type of I/O One-sided I/O of reserve
CPU
One-sided I/O of master
CPU
Switched I/O
Added I/O
modules
are given new parameter
settings and updated by
the CPU.
Driver blocks are not yet
present. Any interrupts
occurring are not
reported.
are updated by the CPU.
Driver blocks are not yet present. Process or
diagnostic interrupts are detected, but are not
reported.
I/O modules still
present
are given new parameter
settings
1)
and updated by
the CPU.
continue operation without interruption.
Added DP stations as for added I/O modules
(see above)
Driver blocks are not yet present. Any interrupts
occurring are not reported.
1) Central modules are first reset. Output modules briefly output 0 during this time (instead of the
configured substitute or hold values).
Reaction to monitoring timeout
If one of the monitored times exceeds the configured maximum the update is canceled. The
fault-tolerant system remains in single mode with the previous master CPU and, assuming
certain conditions are met, attempts the link-up and update later. For additional information,
refer to section Time monitoring (Page 155).
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