Rockwell Automation Logix5000 Controllers Tasks, Programs, and Routines Programming Manual - Manual (Page 5)

Table of contents
Studio 5000 environment ..................................................................................... 7
Additional resources ............................................................................................... 8
Chapter 1
Introduction ............................................................................................................ 9
Select controller tasks ............................................................................................. 9
Use caution in the number of tasks that you use ..................................... 11
Prioritize periodic and event tasks ..................................................................... 11
Additional considerations ............................................................................ 12
Example ........................................................................................................... 13
Leave enough time for unscheduled communication .................................... 14
Avoid overlaps ....................................................................................................... 15
Manually check for overlaps ........................................................................ 16
Programmatically check for overlaps.......................................................... 17
Configure output processing for a task ............................................................. 19
Manually configure output processing ...................................................... 21
Programmatically configure output processing ........................................ 22
Inhibit a task .......................................................................................................... 23
Manually inhibit or uninhibit a task .......................................................... 24
Programmatically inhibit or uninhibit a task ........................................... 25
Create a task ........................................................................................................... 26
Create a periodic task .................................................................................... 27
Language switching ....................................................................................... 29
Adjust the system-overhead time slice .............................................................. 30
Configure the system-overhead time slice ................................................. 31
Adjust the system watchdog time ...................................................................... 32
Adjust the watchdog timer for a task ......................................................... 33
Chapter 2
Introduction .......................................................................................................... 35
Choose the trigger for an event task .................................................................. 35
Module Input Data State Change trigger ......................................................... 37
How an I/O module triggers an event task ............................................... 37
Make sure your module can trigger an event task .................................... 40
Checklist for an Input Event Task ............................................................. 40
Example – Input Event Task ....................................................................... 42
Estimate throughput ..................................................................................... 43
Example – estimate throughput .................................................................. 44
Preface
Manage tasks
Manage event tasks
Rockwell Automation Publication 1756-PM005-EN-P - October 2014 5