In a ctrlX CORE the the standard scheduler for PLC tasks is working in 1ms cycle time at the moment, so the tasks cannot be set faster.
You could use another event to trigger you task faster created directly in the ctrlX COREs scheduler. But at the moment also there is minimum time of 500µs.
Could you explain what you need such low cycle times? As e.g. EtherCat is 2ms minimum in X3 so IO data could also not get updated faster.
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