1766-RM001A-EN-P MicroLogix 1400 Programmable Controllers ...

556 System Status FileFault Override At Power-UpAddress Data Format Range Type User Program AccessS:1/8 binary 0 or 1 control read onlyWhen set (1), causes the controller to clear the Major Error Halted bit (S:1/13) at power-up. The power-up mode is determined by the controllermode switch and the Power-Up Mode Behavior Selection bit (S:1/12).See also:FO - Fault Override on page 61.Startup Protection FaultAddress Data Format Range Type User Program AccessS:1/9 binary 0 or 1 control read onlyWhen set (1) and the controller powers up in the RUN or REM RUNmode, the controller executes the User Fault Routine prior to theexecution of the first scan of your program. You have the option ofclearing the Major Error Halted bit (S:1/13) to resume operation. If theUser Fault Routine does not clear bit S:1/13, the controller faults and doesnot enter an executing mode. Program the User Fault Routine logicaccordingly.NOTEWhen executing the startup protection fault routine, S:6 (major error faultcode) contains the value 0016H.Load Memory Module On Error Or Default ProgramAddress Data Format Range Type User Program AccessS:1/10 binary 0 or 1 control read onlyFor this option to work, you must set (1) this bit in the control programbefore downloading the program to a memory module. When this bit itset in the memory module and power is applied, the controllerdownloads the memory module program when the control program iscorrupt or a default program exists in the controller.NOTEIf you clear the controller memory, the controller loads the default program.Publication 1766-RM001A-EN-P - October 2008