The Safety Task; Safety Task Period Specification - Allen-Bradley Compact GuardLogix 5370 User Manual

Chapter 9 Develop Safety Applications

The Safety Task

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When you create a safety controller project, the Logix Designer application
automatically creates a safety task with a safety program and a main (safety)
routine.
Figure 34 - Safety Task in the Controller Organizer
Within the safety task, you can use multiple safety programs, composed of
multiple safety routines. The GuardLogix controller supports one safety task.
The safety task cannot be deleted.
You cannot schedule standard programs or execute standard routines within
the safety task.

Safety Task Period Specification

The safety task is a periodic timed task. You set the task priority and watchdog
time via the Task Properties - Safety Task dialog box. To open the dialog box,
right-click the Safety Task and choose Properties.
Figure 35 - Configure the Safety Task Period
The safety task is a high priority. You specify the safety task period (in ms) and
the safety task watchdog (in ms). The safety task period is the period that the
safety task executes. The safety task watchdog is the maximum time allowed
from the start of safety task execution to its completion.
Rockwell Automation Publication 1769-UM022C-EN-P - June 2018