This parameter error indicates that the axis was about to move its Target Position outside the extend or retract limit. The target position is truncated to the limit when this error occurs. Commands that have a requested position outside the limits are caught immediately by the Attempt to go beyond extend limit and Attempt to go beyond the retract limit parameter errors.
Therefore, this error occurs only in these cases:
An axis has its deceleration rate lowered in the middle of a move enough so that it overshoots the commanded position and limit. We could catch this error when the command is issued but do not because some applications have an axis decelerate slowly for a period of time, but then issue another command to stop it within the limits. These applications would be impossible if we didn’t allow this deceleration even though, if uninterrupted, it would bring the axis outside the limit.
A spline is being followed and the spline goes outside the limits. Unless the Auto Stop is set up to halt on parameter errors, the spline will continue even though the positions are truncated at the limits.
Note: This error will not occur when the Actual Position goes outside the limits. That is, you will be able to control position at either limit even though the Actual Position may go outside the limits temporarily.
Note: In firmware dated earlier than 19991021, this error is also used for when a position/pressure axis is controlling pressure and the Actual Position moves beyond the limits. In firmware on or after this date, this condition uses the new Pressure control went outside position limits error instead.
Copyright (c) 1997-2015 by Delta Computer Systems, Inc.