Corrected from:
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Response of the new version:
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What happens?
Sporadically, cycle time extensions of the highest priority task occur in the first seconds after the start of PLC processing, which can lead to a watchdog exception depending on the load of the controller.
When does the behaviour occur?
The behaviour can be observed if the Unified Write Filter (UWF) is not activated in the Windows IoT operating system. In this case, when the controller is switched off, the file system on the CFast card may not be left properly. The file system is then checked when the system is started. This can lead to the described cycle time extensions in PLC processing.
Which products are affected?
Cabinet Controller c750 from V1.0
Short-term measures:
Activate the Unified Write Filter in the Windows IoT operating system.
Alternatively, make sure that the highest-priority PLC task is not utilised by more than approx. 25%. Check the task cycle times in the 'Monitoring' tab of the 'Task configuration' object.
Evaluation / recommendations:
Without enabling a Unified Write Filter in the Windows IoT operating system of the c750, the cycle time can increase significantly when the controller is switched on, leading to a task cycle time overrun and thus stopping PLC processing.
Automatic Translation
