Allen-Bradley Logix5000 Reference Manual

66 Rockwell Automation Publication 1756-RM003N-EN-P - October 2011
Chapter 1 FactoryTalk Alarms and Events Logix-based Instructions (ALMD, ALMA)
Execution:
Condition Relay Ladder Action
Prescan The rung-condition-out is set to false.
All the xInAlarm parameters are cleared and all alarm conditions
are acknowledged.
All operator requests, timestamps, and delivery flags are cleared.
Rung-condition-in is false The instruction does not execute.
EnableOut is cleared.
Rung-condition-in is true The instruction executes.
EnableOut is set.
Postscan The rung-condition-out is set to false.
Condition Function Block Action Structured Text Action
prescan All operator requests, timestamps, and delivery flags are
cleared.
All the xInAlarm parameters are cleared and all alarm
conditions are acknowledged.
All operator requests, timestamps, and delivery flags are
cleared.
All the xInAlarm parameters are cleared and all alarm
conditions are acknowledged.
instruction first scan No action taken. No action taken.
instruction first run No action taken. No action taken.
EnableIn is cleared The instruction does not execute.
EnableOut is cleared.
The instruction executes.
EnableOut is always set.
EnableIn is set The instruction executes.
EnableOut is set.
The instruction executes.
EnableOut is always set.
postscan No action taken. No action taken.

Allen-Bradley Logix5000 Specifications

General

Brand	Allen-Bradley
Model	Logix5000
Category	Controller
Language	English