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

106 Using the High-Speed Counter and Programmable Limit SwitchUser Interrupt Enable (UIE)Description Address DataFormat(1) For Mode descriptions, see HSC Mode (MOD) on page 116.HSCModes (1)TypeUser ProgramAccessUIE - User Interrupt Enable HSC:0/UIE bit 0…9 control read/writeThe UIE (User Interrupt Enable) bit is used to enable or disable HSCsubroutine processing. This bit must be set (1) if the user wants thecontroller to process the HSC subroutine when any of the followingconditions exist:• Low preset reached• High preset reached• Overflow condition - count up through the overflow value• Underflow condition - count down through the underflow valueIf this bit is cleared (0), the HSC sub-system does not automatically scanthe HSC subroutine. This bit can be controlled from the user program(using the OTE, UIE, or UID instructions).ATTENTIONIf you enable interrupts during the program scan via an OTL, OTE, or UIE,this instruction must be the last instruction executed on the rung (lastinstruction on last branch). It is recommended this be the only outputinstruction on the rung.User Interrupt Executing (UIX)Description Address Data HSC Modes (1) Type User ProgramFormatAccessUIX - User Interrupt Executing HSC:0/UIX bit 0…9 status read only(1) For Mode descriptions, see HSC Mode (MOD) on page 116.The UIX (User Interrupt Executing) bit is set (1) whenever the HSCsub-system begins processing the HSC subroutine due to any of thefollowing conditions:• Low preset reached• High preset reached• Overflow condition - count up through the overflow valuePublication 1766-RM001A-EN-P - October 2008