Pcs 7, Step 5: Switch To Cpu With Modified Configuration - Siemens SIMATIC S7-400H System Manual

14.3.5

PCS 7, Step 5: Switch to CPU with modified configuration

Starting situation
The modified hardware configuration is loaded into the standby 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. In the "Switch" dialog box, select the "with altered configuration" option and click the
4. Acknowledge the prompt for confirmation with "OK".
Result
The standby CPU links up, is updated (see section Link-up and update (Page 93)) 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 are not addressed by the
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 aborted 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 in certain conditions attempts to perform the change of master
later. For further information, refer to section Time monitoring (Page 106).
S7-400H
System Manual, 09/2007, A5E00267695-03
Operating Mode" from the menu.
"Switch" button.
One-sided I/O of
previous master CPU
CPU.
are no longer addressed
by the CPU.
Output modules output
the configured substitute
or holding values.
CPU.
System modifications in operation
14.3 Adding components in PCS 7
One-sided I/O of new
master CPU
are configured and updated by the CPU.
Driver blocks are not yet present. Process or
diagnostics interrupts are detected, but are not
reported.
are reconfigured and
1)
updated by the CPU.
as for added I/O modules (see above)
Switched I/O
continue operation
without interruption.
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