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

Function Files 61MP - Module PresentThe MP (Module Present) bit can be used in the user program todetermine when a memory module is present on the controller. This bit isupdated once per scan, provided the memory module is first recognizedby the controller. To be recognized by the controller, the memory modulemust be installed prior to power-up or when the controller is in anon-executing mode. If a memory module is installed when the controlleris in an executing mode, it is not recognized. If a recognized memorymodule is removed during an executing mode, this bit is cleared (0) at theend of the next ladder scan.WP - Write ProtectWhen the WP (Write Protect) bit is set (1), the module is write-protectedand the user program and data within the memory module cannot beoverwrittenIMPORTANTOnce the WP bit is set (1), it cannot be cleared. Only set this bit if you wantthe contents of the memory module to become permanent.FO - Fault OverrideThe FO (Fault Override) bit represents the status of the fault overridesetting of the program stored in the memory module. It enables you todetermine the value of the FO bit without actually loading the programfrom the memory module.IMPORTANTThe memory module fault override selection in the Memory ModuleInformation (MMI) file does not determine the controller’s operation. Itmerely displays the setting of the user program’s Fault Override bit (S:1/8)in the memory module.See Fault Override At Power-Up on page 556 for more information.LPC - Load Program CompareThe LPC (Load Program Compare) bit shows the status of the loadprogram compare selection in the memory module’s user program statusfile. It enables you to determine the value without actually loading theuser program from the memory module.See Memory Module Program Compare on page 560 for moreinformation.Publication 1766-RM001A-EN-P - October 2008