Publication 2098-IN005C-EN-P — March 2008
Minimizing the Effects of Feedback Signal Loss 163
10. Click OK to accept the new trending dialog settings.
In this example, the Y-Axis scaling was adjusted to show a range
of -0.10 (min) to 0.10 (max) position units, with 3 decimal places
of resolution. If the waveform is not symmetrical, the minimum
and maximum values may be different from each other.
Set the New Position Error Limit
Follow these steps to adjust the default Position Error Tolerance limit
setting based on your knowledge of the position error excursion limit
values of the application.
1. Set the Logix controller to the Offline mode.
2. Right-click your axis in the Explorer dialog and choose Properties.
The Axis Properties dialog opens.
3. Click the Limits tab.
4. Change the Position Error Tolerance limit setting according to your
minimum and maximum excursion limit values obtained earlier.
In this example the new Position Error Tolerance setting is 0.125
position units, just above the 0.10 position units observed in the
trending dialog. This position error margin is added to avoid
nuisance trips. Values above this new limit setting will cause a
position error fault (E19).
5. Click OK.
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