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

10.5.5

STEP 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 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 (see Chapter 5) and becomes the master.
The former master CPU switches to STOP mode, the fault-tolerant system
continues to work in Solo mode.
Behavior of the I/O
Type of I/O One-way I/O of previous
I/O modules to be Are no longer addressed by the CPU.
1)
removed
I/O modules that Are no longer addressed
continue to be by the CPU.
present
Output modules output the
configured substitute or
holding values.
DP stations to be as for I/O modules to be removed (see above)
removed:
1) no longer contained in the hardware configuration, but still plugged in
2) Central modules are first reset in addition. Output modules briefly output 0 during this time (instead of the
substitute or holding values configured).
S7-400H Programmable Controller Fault-Tolerant Systems
A5E00068197-04
Modifications to the System while in Operation
One-way I/O of new
master CPU
Are re-parameterized
and updated by the CPU.
master CPU
2)
Continue to work without
interruption.
Switched I/O
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