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

326 Using InterruptsEII User Interrupt Pending (UIP)Sub-Element Description Address Data Format Type User ProgramAccessUIP - User Interrupt Pending EII:0/UIP binary (bit) status read onlyUIP (User Interrupt Pending) is a status flag that represents an interrupt ispending. This status bit can be monitored, or used for logic purposes, inthe control program if you need to determine when a subroutine cannotexecute immediately.This bit is automatically set and cleared by the controller. The controllercan process 1 active and maintain up to 2 pending user interruptconditions before it sets the pending bit.EII Event Interrupt Enable (EIE)Sub-Element Description Address Data Format Type User ProgramAccessEIE - Event Interrupt Enabled EII:0/EIE binary (bit) control read/writeEIE (Event Interrupt Enabled) allows the event interrupt function to beenabled or disabled from the control program. When set (1), the functionis enabled, when cleared (0, default) the function is disabled.This bit is controlled by the user program and retains its value through apower cycle.EII Auto Start (AS)Sub-Element Description Address Data Format Type User ProgramAccessAS - Auto Start EII:0/AS binary (bit) control read onlyAS (Auto Start) is a control bit that can be used in the control program.The auto start bit is configured with the programming device and storedas part of the user program. The auto start bit automatically sets the EIIEvent Interrupt Enable (EIE) bit when the controller enters any executingmode.Publication 1766-RM001A-EN-P - October 2008