base update period - PLC Programming & Automation

The Motion Group and the Coarse Update Period: What Happens When You Ask for Too Much

Three timelines of a 4.0 ms base update period with the motion task drawn as a coloured block at the start of each period and everything else in grey: eight axes leaving most of each period free, sixteen axes leaving little for the ladder, and twenty-four axes where the motion task fills the whole period and runs into itself, annotated with GroupFault.GroupTaskLoadingFault bit 2

The Motion Group and the Coarse Update Period: What Happens When You Ask for Too Much Bit 2 of MOTION_GROUP.GroupFault is GroupTaskLoadingFault, and the motion instruction reference describes it in plain words: the group coarse update period is too low, and user application tasks are not getting enough time to execute. That is a 1756-L84E … Read more