Allen-Bradley Logix5000 Reference Manual page 80

Chapter 1 FactoryTalk Alarms and Events Logix-based Instructions (ALMD, ALMA)
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When you create an alarm instruction, you must create and assign a tag of the
correct alarm data type for that alarm. For example, create MyDigitalAlarm of
data type ALARM_DIGITAL. In relay ladder, these instruction parameters must
be entered on the instruction:
· ProgAck
· ProgReset
· ProgDisable
· ProgEnable
In relay ladder and structured text, the value or tag you assign to an instruction
parameter (such as ProgAck) is automatically written to the alarm tag member
(such as MyAnalogAlarm.ProgAck) each time the instruction is scanned.
In relay ladder and structured text, if you want to programmatically access the
alarm structure, assign the structure tag to the parameter on the instruction. For
example, to use MyAnalogAlarm.ProgAck in logic, assign the tag
MyAnalogAlarm.ProgAck to the ProgAck parameter.
Rockwell Automation Publication 1756-RM003N-EN-P - October 2011