1747-DCM A-B Communication Interface
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The motion planner interrupts all user tasks, regardless of their priority. • The number of axes and coarse update period for the motion group affect how long and how often the motion planner runs. • If the motion planner is running when a task is triggered, the task waits until the motion planner is done. • If the coarse update period occurs while a task is running, the task pauses to let the motion planner run.
Tip: CompactLogix 5370 and earlier CompactLogix controllers have an I/O task. CompactLogix 5380 and 5480 controllers do not have an I/O task. FlexLogix, and DriveLogix controllers use a dedicated periodic task to process I/O data. This I/O task: • Does not show up in the Tasks folder of the controller. • Does not count toward the task limits for the controller. • Operates at priority 6. • Runs at the fastest RPI you have scheduled for the system. • Runs for as long as it takes to scan the configured I/O modules. As you assign priorities to your tasks, consider the I/O task
System overhead is the time that the controller spends on unscheduled communication. • Unscheduled communication is any communication that you do not configure through the I/O configuration folder of the project, such as Message (MSG) instructions and communication with HMIs or workstations. • System overhead interrupts only the continuous task. • The system overhead time slice specifies the percentage of time (excluding the time for periodic or event tasks) that the controller devotes to unscheduled communication. • The controller performs unscheduled communication for up to 1 ms at a time and then resumes the continuous task.
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