82 Rockwell Automation Publication 1756-RM003N-EN-P - October 2011
Chapter 1 FactoryTalk Alarms and Events Logix-based Instructions (ALMD, ALMA)
Controller-based Alarm
Execution
Controller-based alarms process inputs from two sources.
Source Description
Alarm tag members Alarm tag members are, for the most part, processed when the user application scans the alarm
instruction. This includes:
· processing changes to configuration parameters.
· evaluating the alarm condition.
· measuring elapsed time for MinDuration.
· capturing InAlarmTime and RetToNormalTime timestamps.
· capturing associated tag values.
· processing Prog and Oper commands.
In addition, these alarm tag status members are updated as alarm messages are delivered to each
subscriber, asynchronously to the program scan:
· DeliveryEN, DeliveryER, DeliveryDN
· NoSubscriber, NoConnection, CommError, AlarmBuffered, SubscNotified
Client messages Client messages are processed as they are received, asynchronously to the program scan:
· Reset, Acknowledge, Disable/Enable, and Suppress/Unsuppress commands from an RSLogix
5000 terminal
· Reset, Acknowledge, Disable/Enable, and Suppress/Unsuppress commands from a FactoryTalk
View SE alarm subscriber
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