Rockwell-automation Logix5000 Controllers Tasks, Programs, and Routine Manual do Utilizador descarregar pdf (Página 48)

Chapter 2 Manage event tasks

Checklist for a motion group task

For This Make Sure You

1. Scan time Make sure the scan time of the event task is significantly less than the base update period of the motion group. Otherwise, a task

overlap could occur.

2. Task priority Configure the event task as the highest priority task.

If a periodic task has a higher priority, the event task may have to wait until the periodic task is finished.

3. Number of event tasks Limit the number of event tasks.

Each additional task reduces the processing time that is available for other tasks. This could cause an overlap.

4. Automatic output processing For an event task, you can typically disable automatic output processing (default). This reduces the elapsed time of the task.

To let the registration input of an axis trigger an event task, use the Axis

Registration 1 or Axis Registration 2 triggers.

Let an event trigger this task.

Let registration input 1….

…of this axis trigger the task.

Interrupt all other tasks.

When the task is done, do not update digital outputs in the local chassis.

When the specified registration input reaches its trigger condition, it triggers the

event task.

Axis registration trigger

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

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