50 Rockwell Automation Publication 1756-RM003N-EN-P - October 2011
Chapter 1 FactoryTalk Alarms and Events Logix-based Instructions (ALMD, ALMA)
State Diagrams when Acknowledgment Not Required
Arithmetic Status Flags: None
Fault Conditions: None
Execution:
InAlarm = False InAlarm = True
In = Condition, MinDurationACC >= MinDurationPRE
In != Condition
Acked = True
Latched = False
InAlarm = False InAlarm = True
In = Condition, MinDurationACC >= MinDurationPRE
In != Condition, Reset
1
Acked = True
Latched = True
1
Alarm can be reset by several different ways: ProgReset, OperReset, clients (RSLogix 5000
software, RSView software)
Condition Relay Ladder Action
Prescan The rung-condition-out is set to false.
InAlarm is cleared and Acked is set.
All operator requests, timestamps, and delivery flags are cleared.
Rung-condition-in is false The rung-condition-out is set to false.
EnableIn and EnableOut are cleared.
The In parameter is cleared, and the instruction evaluates to
determine the alarm state.
Rung-condition-in is true The rung-condition-out is set to true.
EnableIn and EnableOut are set.
The In parameter is set, and the instruction evaluates to determine
the alarm state.
Postscan The rung-condition-out is set to false.
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