Logix5000 Controllers General Instructions - SLAC Confluence

42 Digital Alarm Instruction (ALMD)ExecutionThe tables below show execution action for Ladder Logic andFunction Block programming languages.Ladder LogicConditionprescanrung-condition-in is falserung-condition-in is truepostscanActionThe rung-condition-out is set to false. All operator requests,timestamps, and delivery flags are cleared. The alarmcondition is set to OutOfAlarm and Acknowledged.The rung-condition-out is set to false. The .In parameter iscleared, and the instruction evaluates to determine thealarm state.The rung-condition-out is set to true. The .In parameter isset, and the instruction evaluates to determine the alarmstate.The rung-condition-out is set to false.Function BlockConditionprescaninstruction first scaninstruction first runEnableIn is clearedEnableIn is setpostscanActionAll operator requests, timestamps, anddelivery flags are cleared. The alarmcondition is set to OutOfAlarm andAcknowledged.No action taken.No action taken.The instruction does not execute. EnableOutis cleared.The instruction executes.EnableOut is set.No action taken.Publication 1756-RM003I-EN-P - January 2007