Step 5: Switch To Cpu With Modified Configuration - Siemens CPU 410-5H Process Automation System Manual

10.3.5

Step 5: Switch to CPU with modified configuration

Starting situation
The modified hardware configuration is downloaded to the reserve CPU.
Procedure
1. In SIMATIC Manager, select a CPU of the fault-tolerant system, then choose "PLC >
2. In the "Operating Mode" dialog box, click the "Switch to..." button.
3. Acknowledge the prompt for confirmation with "OK".
Result
The reserve CPU connects, is updated (see section Link-up and update (Page 109)) and
becomes the master. The previous master CPU switches to STOP mode, the fault-tolerant
system operates with the new hardware configuration in single mode.
Reaction of the I/O
Type of I/O
Added I/O
modules
I/O modules still
present
Added DP stations are not addressed by the
The central modules are first reset. Output modules briefly output 0 during this time (instead of the
1)
configured substitute or hold values).
Reaction to monitoring timeout
The update is canceled and no change of master takes place if one of the monitored times
exceeds the configured maximum. The fault-tolerant system remains in single mode with the
previous master CPU and, assuming certain conditions are met, attempts the master
changeover later. For additional information, refer to the section Time monitoring (Page 110).
CPU 410-5H Process Automation/CPU 410 SMART
System Manual, 10/2013, A5E32631667-AA
Operating Mode" from the menu.
In the "Switch" dialog box, select the "with altered configuration" option and click the
"Switch" button.
One-sided I/O of
previous master CPU
are not addressed by the
CPU.
are no longer addressed
by the CPU.
Output modules output
the configured substitute
or holding values.
CPU.
System modifications during redundant operation
One-sided I/O of new
master CPU
are given new parameter settings and updated by
the CPU.
Driver blocks are not yet present. Process or
diagnostic interrupts are detected, but are not
reported.
are given new parameter
settings and updated by
1)
the CPU.
as for added I/O modules (see above)
10.3 Adding components
Switched I/O
continue operation
without interruption.
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