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4 Feed Axis Operation
4-42
(2) Stopping an Axis When a Software Limit Is Exceeded
If the position reference value exceeds the upper or lower software limit, decelerate the axis to a stop immedi-
ately.
Make sure that the deceleration rate when this occurs can be set by the host controller in advance.
(3) Clearing the Software Limit Status
To clear the software limit status of an axis, you must move the axis back in the opposite direction from which
the software limit was exceeded. Perform this return operation for each axis individually. Send the INTERPO-
LATE (34 hex) command from the host controller to move the axis for the return operation using the current
coordinate system position (APOS).
When this return operation is performed and the software limit status is cleared, execution of the return opera-
tion has been completed.
When implementing software limits at the host controller, be aware of the monitor scan
time of the position reference (the signal monitor time interval) or the time until distribution
of the deceleration reference is completed, the deceleration rate of the axis, and the dis-
tance to the stroke end of the machine from the software limits. If the axis begins to
exceed a software limit at its maximum speed, the axis may be unable to stop until it col-
lides with the stroke end of the machine.