Step 7, Step 6: Switch To Cpu With Modified Configuration - Siemens SIMATIC S7-400H Manual

Modifications to the System while in Operation
10.4.6

STEP 7, Step 6: 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 select the
menu command PLC > Operating Mode.
2. In the Operating Mode dialog box click the Switch to button.
3. In the Switch to dialog box select the option with modified configuration
and click the Switch button.
4. Confirm the check question that follows with OK.
Result
The standby CPU connects, is updated and becomes the master. The former
master CPU switches to STOP mode, the fault-tolerant system works with the new
hardware configuration in Solo mode.
Behavior of the I/O
Type of I/O One-way I/O of previous
Added I/O modules Are not addressed by the
CPU.
I/O modules that Are no longer addressed
continue to be by the CPU.
present
Output modules output the
configured substitute or
holding values.
Added DP stations Are not addressed by the
CPU.
1) Central modules are first reset in addition. Output modules briefly output 0 during this time (instead of the
substitute or holding values configured).
10-28
One-way I/O of new
master CPU
Are parameterized and updated by the CPU.
Output modules briefly output the substitute values
configured.
Are re-parameterized
and updated by the CPU.
as for added I/O modules (see above)
S7-400H Programmable Controller Fault-Tolerant Systems
master CPU
1)
Continue to work without
interruption.
Switched I/O
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