14.9.4
Step C: Loading new hardware configuration in the standby CPU
Starting situation
The fault-tolerant system is operating in single mode.
Procedure
Load the compiled hardware configuration in the standby CPU that is in STOP mode.
NOTICE
The user program and connection configuration can not be downloaded in single mode.
Result
The modified parameters in the new hardware configuration of the standby CPU do not yet
have an effect on ongoing operation.
14.9.5
Step D: Switch to CPU with modified configuration
Starting situation
The modified hardware configuration is downloaded to 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 and becomes the master. The previous master CPU
switches to STOP mode, the fault-tolerant system continues operating in single mode.
S7-400H
System Manual, 09/2007, A5E00267695-03
Operating Mode" from the menu.
"Switch" button.
System modifications in operation
14.9 Reconfiguration of a module
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