Siemens SIMATIC PCS 7 Function Manual page 179

● You have access to the automation system:
● You have an Ethernet connection to the H system:
Fault-tolerant Process Control Systems (V8.0)
Function Manual, 03/2012, A5E02779471-02
Turn the key switch on the failed CPU from its current position to STOP back to the setting
(RUN).
In the "Operating Mode" dialog box, restart the CPU in Rack 1, which is in STOP mode.
– Open the PCS 7 project on an ES, click the "Online" icon in the task bar of SIMATIC
Manager and select a CPU in the right window pane.
– Open the shortcut menu with a right click and open the "Operating Mode" dialog box
with the menu command PLC > Operating Mode.
– Select the CPU in Rack 1 and click "Warm restart".
The CPU in Rack 1 links up again and performs an update. The system is then in
"Redundant" mode again.
Failure, Switchover and Return of Fault-tolerant Components
6.2 Automation system
179