Rockwell-automation Logix5000 Controllers Tasks, Programs, and Routine Manuale Utente Scaricare il pdf (Pagina 54)

Chapter 2 Manage event tasks

Example – axis watch trigger

At the labeling station of a bottling line, you want to check the position of the

label on the bottle.

• When the axis reaches the position that is defined as the watch point, check

the label and perform any required adjustment.

• Due to the speed of the line, you have to arm axis for the watch position

within the event task.

Let the watch position…

…for the axis named Axis_1 trigger the event task..

This event task interrupts all other tasks.

The following logic arms and re-arms the axis for the watch position.

Continuous task

If Arm_Watch = 1 (system is ready to set up a watch position) then

the ONS instruction limits the EVENT instruction to one scan.

the EVENT instruction triggers Task_1 (event task).

Task_1 (event task)

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

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Rockwell-automation Logix5000 Controllers Tasks, Programs, and Routine Manuale Utente Pagina 54