Product specifications
Section 4 Operation Start Modes
3BSE036351-510 A 183
– After having rebuilt the hardware on the CEX bus, that is, after removing
or adding a number of base plates (equipped with CEX modules or not)
the upper CPU (the CPU connected to the part of the RCU Link cable that
is marked “UPPER”) must be started as the primary CPU the first time.
Start Modes
Warm Start
Application-controlling tasks are initiated. Variable values are initialized unless
marked Retain or Cold retain.
To initiate a warm restart, disconnect the power supply for a few seconds.
Following a power failure, the warm restart function will be automatically initiated
on power restoration.
Cold Restart
The application program restarts. Variable values are initialized unless marked Cold
retain.
To initiate a cold restart, the Controller must be restarted by briefly pressing
the INIT push button (less than 2.5 seconds).
Cold Restart in Redundant Configuration
To restart CPUs running in redundant configuration:
1. Perform a Controller Reset of the backup CPU (see below). The system will go
into single CPU state.
2. Wait a few seconds and then restart the Primary CPU by pressing the INIT push
button less than 2.5 seconds.
3. The system will be upgraded to synchronized CPU state once again.
After a power fail, instead of doing a warm restart of the application SIL3
applications are restarted using cold retain marked values saved in the controller
periodically with a cycle time set by the user.