Logix5000 Controllers General Instructions - SLAC Confluence

32 Digital Alarm Instruction (ALMD)subscription status and to display alarm status changes. If aconnection to RSLinx Enterprise software is lost, the controller canbriefly buffer alarm data until the connection is restored.Digital Alarm OperandsThese operands are located on the instruction.Ladder Logic OperandsOperand Type Format DescriptionALMD tag ALARM_DIGITAL structure ALMD structureProgAck BOOL TagImmediateProgReset BOOL TagImmediateProgDisable BOOL TagImmediateProgEnable BOOL TagImmediateValue is copied to .ProgAck when instruction executes.On transition from False to True, acknowledges alarm(if acknowledgement is required).Value is copied to .ProgReset when instructionexecutes. On transition from False to True, resets alarm(if resetting is required).Value is copied to .ProgDisable when instructionexecutes. When True, disables alarm (does notoverride Enable Commands).Value is copied to .ProgEnable when instructionexecutes. When True, enables alarm (takes precedenceover Disable commands).MinDurationPRE DINT Immediate Specifies how long the alarm condition must be metbefore it is reported (milliseconds).MinDurationACC DINT Immediate Indicates the current accumulator value for the alarm’sMinDuration timer.Structured Text OperandsALMD(ALMD,In,ProgAck,ProgReset,ProgDisable,ProgEnable)Operand Type Format DescriptionALMD ALARM_DIGITAL structure ALMD structureIn BOOL TagImmediateProgAck BOOL TagImmediateAlarm Condition to be monitored. Value is copied to .In wheninstruction executes.Value is copied to .ProgAck when instruction executes. On transitionfrom False to True, acknowledges alarm (if acknowledgement isrequired).Publication 1756-RM003I-EN-P - January 2007