Modifying the System During Operation
11-20
Automation System S7-400H Fault-tolerant Systems
A5E00068197-07
11.3.5 PCS 7, Step V: Switch to CPU with Modified Configuration
Initial situation
The modified hardware configuration is loaded into the standby CPU.
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, click the Toggle button.
3. In the Toggle dialog box, select the option with modified configuration and
click the Toggle button.
4. Confirm the query that follows with OK.
Result
The standby CPU links up, is updated (see Chapter 6) and becomes the master.
The former master CPU switches to STOP mode, the fault-tolerant system works
with the new hardware configuration in single mode.
Behavior of the I/O
Type of I/O One-way I/O of previous
master CPU
One-way I/O of new
master CPU
Switched I/O
I/O modules to be
removed
1)
Are no longer addressed by the CPU.
Driver blocks are no longer present.
I/O modules that
continue to be
present
Are no longer addressed
by the CPU.
Output modules output the
configured substitute or
holding values.
Are re-parameterized
2)
and updated by the CPU.
Continue to work without
interruption.
DP stations to be
removed:
as for I/O modules to be removed (see above)
1) No longer contained in the hardware configuration, but still plugged in
2) Central modules are additionally first reset. Output modules briefly output 0 during this time (instead of the
configured substitute or holding values).
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