ABB AC 31 - 3.5. Power on; program launch

Presentation / operation
ABB Control - AC 31 Page 1-11
1SBC 260400 R1001-b 06.99
3.5. Power on / program launch
The central unit executes a complete series of auto tests at each startup. The program can
only be launched if no errors have been detected.
The auto tests verify the following:
- the program syntax,
- the data transmission,
- the status of the extensions,
- the status of the remote units if there is a master central unit,
- the startup conditions (reset or not of internal memories).
The central unit initialization depends on the startup type:
Startup type Initialization
Power on
or software RESET or warm restart
- Clear the program in RAM
- Copy the Flash EPROM contents to RAM
- Clear the data in RAM according to
the configuration
Central unit STOP / RUN button - Copy the Flash EPROM contents to RAM
The RAM remains unchanged if there isn’t a
program in the Flash EPROM.
- Clear the data in RAM according to
the configuration
Software cold restart - Clear the program and data in RAM
- Copy the Flash EPROM contents
to RAM
The bus system is also initialized after startup if the central unit is the master on the CS 31
bus.