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Selecting this will bring up the New Task pop-up. We are able to give the task a name description and select which type of task we want to create. The function and the setting of the Watchdog timer is detailed later in this tutorial. We can also determine whether we have any task overlaps, where the task is triggered to be executed before it has completed its last complete execution cycle.
From the image below, we can see that the 10 millisecond period assigned to the MainTask on this project is too fast as the scan time is 21 milliseconds and the interval between triggers is between This means that the periodic task is being triggered to run and triggered a further times before the first operation has completed executing fully.
If an overlap occurs, the PLC Controller disregards the trigger that caused the overlap so that you may miss a vital program execution. The Minor Fault bit will be set in the PLC to warn of the overlap, but the controller will still function less efficiently. Therefore it is essential to set your task execution times correctly to avoid overlaps. We can adjust the time of the task trigger, but we can also adjust the Watchdog timer. Each task contains a Watchdog timer to monitor the duration of the task.
If the Watchdog timer expires, then a major fault will be triggered. Depending on the controller's fault handling routine, this may result in the controller shutting down and affecting the process the PLC is handling. The Watchdog time can range from 1 millisecond to seconds, the default is milliseconds.
It begins to run when the task is triggered and stops when all routines have been executed. The controller fault handler can be used to clear a watchdog fault. If the same watchdog fault occurs a second time during the same logic scan, the controller enters Faulted mode, regardless of whether the controller fault handler clears the watchdog fault.
In this tutorial, we learned that there are different types of tasks in Allen Bradley PLCs that are used to execute the logic. We have the Continuous Task, which is responsible for executing all the logic from top to bottom.
They can take time to execute entirely, but once it has processed all the logic, it will immediately restart from the top again. Then we have Periodic Tasks. These types of tasks are used when time is of the essence. They are triggered periodically and can to set to a time frame of between 0. This allows for a great deal of flexibility. They can be used in high-accuracy applications and much slower processes, safe in the knowledge that they will be executed consistently.
The final type of task we have looked at is the Event Task. They are useful in applications that were constantly scanning the logic would cause a slowdown of other processes. Triggering it only when it is required can save valuable PLC performance. After delving into the different types of tasks, we looked at additional considerations such as setting an appropriate time frame for the task to run as well as monitoring the performance of a task.
Minor Faults can occur when the task time is set too short, and the PLC reports an overlap. This is when the task is retriggered before the current trigger has been completed. A Major Fault can occur when the Task Watchdog timer Watchdog fault occurs twice during the same logic scan.
Cast your mind back to the beginning of this tutorial, where we asked a question as to which type of task would be best suited to an indexing table with a dwell flag but no stop flag.
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WebScripting must be enabled to use this site. WebMonitoring Task Performance in RSLogix In RSLogix , we can monitor the performance of any given task by selecting the properties of the task by right-clicking on . WebApr 1, аи RSLOGIX TASK MONITOR IIOT+ subscribers Subscribe K views 5 years ago Softwares used: RSLogix or Studio , RSLinx Classic, .