What is the priority range assigned to periodic tasks?

Periodic tasks in a programmable logic controller (PLC) environment are typically assigned a priority range that allows for effective scheduling and execution of tasks based on their frequency and timing requirements. The range of 1 to 15 is standard in many PLC systems, as it provides a sufficient number of priority levels to manage various tasks effectively.

This range allows for both high-priority tasks, which may need to be executed more frequently or require immediate attention, and lower-priority tasks that can be scheduled for less critical operations. By having a broader range with multiple priority levels, the system can prioritize tasks based on their deadlines and execution needs, ensuring that essential operations are completed without delay.

In contrast, the other options present narrower ranges that may not accommodate the variety of task requirements found in complex industrial applications. The range 1 to 10 lacks the granularity needed for more intricate task management. The option of 0 to 20 includes a zero priority, which is not standard practice, as priority levels typically start from 1. A range of 1 to 5 may be too restrictive and could limit the ability to assign different levels of urgency to multiple tasks competing for CPU time.

Thus, a priority range from 1 to 15 is optimal for managing periodic