Rockwell-automation Logix5000 Controllers Tasks, Programs, and Routine Manual do Utilizador descarregar pdf (Página 65)

Manage event tasks Chapter 2

Example – EVENT Instruction trigger

A controller uses multiple programs except for a common shut down procedure.

Each program uses a program-scoped tag named Shut_Down_Line that turns on if

the program detects a condition that requires a shut down.

Event Task Properties

Let an event trigger this task.

Let an EVENT instruction trigger the task.

No tag is required.

Interrupt all other tasks.

Ladder Diagram in Program_A

If Shut_Down_Line = on (conditions require a shut down) then

run the Shut_Down task one time.

Rockwell Automation Publication 1756-PM005-EN-P - October 2014 65

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Rockwell-automation Logix5000 Controllers Tasks, Programs, and Routine Manual do Utilizador Página 65