Presentation / operationABB Control - AC 31 Page 1-111SBC 260400 R1001-b 06.993.5. Power on / program launchThe central unit executes a complete series of auto tests at each startup. The program canonly 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 InitializationPower onor software RESET or warm restart- Clear the program in RAM- Copy the Flash EPROM contents to RAM- Clear the data in RAM according tothe configurationCentral unit STOP / RUN button - Copy the Flash EPROM contents to RAMThe RAM remains unchanged if there isn’t aprogram in the Flash EPROM.- Clear the data in RAM according tothe configurationSoftware cold restart - Clear the program and data in RAM- Copy the Flash EPROM contentsto RAMThe bus system is also initialized after startup if the central unit is the master on the CS 31bus.
