Rockwell Automation GMLC Reference Manual - Manual (Page 556)

Publication GMLC-5.2 - November 1999
519
5. Use the Control Settings block to re-enable the Hardware Overtravel
Checking data bit.
Software Overtravel Fault
Software_overtravel_fault (sometimes called Software Travel Limits
Fault) is a logical (Boolean) variable which has values of:
• 1 (true) if either the maximum positive or maximum negative travel
for the specified axis is exceeded
• 0 (false) if not
In the Tag Explorer, select both Axis System Variables and the desired
physical axis, then select Software_overtravel_fault in the Tag Window.
When evaluated in an expression, the value of the
Software_overtravel_fault variable indicates whether or not the position
of a specific axis has exceeded either the maximum positive or maximum
negative travel parameter values.
When Software_overtravel_fault = 1, Axis_fault = 2, Axis_status = 8 if
no other faults of higher priority are active on the axis, and Global_fault =
2 if no other faults of higher priority are active on any axis.
A software overtravel fault can only occur if the motion controller is
configured to use software travel limits. See in the Setup section of the
Installation and Setup manual for your motion controller for more
information on configuring software travel limits.
!
ATTENTION: Be careful to move the axis in the
direction opposite the previous move (i.e. away from
the overtravel condition). Movement in the wrong
direction may cause physical harm to materials,
machinery or to the operator.