Rockwell-automation Logix5000 Controllers Tasks, Programs, and Routine Manual do Utilizador descarregar pdf (Página 50)

Chapter 2 Manage event tasks

Example – axis registration trigger

In a line that packages candy bars, you have to make sure that the perforation

occurs in the correct location on each bar.

• Each time the registration sensor detects the registration mark, check the

accuracy of an axis and perform any required adjustment.

• Due to the speed of the line, you have to arm the registration input within

the event task.

A registration sensor is wired as registration input 1…

…for the axis named Axis_1.

This event task interrupts all other tasks.

The following logic arms and re-arms the registration input.

Continuous task

If Arm_Registration = 1 (system is ready to look for the registration mark) then

the ONS instruction limits the EVENT instruction to one scan.

the EVENT instruction triggers Task_1 (event task).

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

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Rockwell-automation Logix5000 Controllers Tasks, Programs, and Routine Manual do Utilizador Página 50