Rockwell Automation GMLC Reference Manual User Manual
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Publication GMLC-5.2 - November 1999
517
If position error fault action is set to STATUS ONLY, position error faults
must be handled within the GML Commander diagram. In general, this
setting should only be used in applications where neither the standard
STOP MOTION nor DISABLE DRIVE actions are appropriate. See the
Setup section of the Installation and Setup manual for your motion
controller for more information on configuring the position error fault
action.
You can directly clear a position error fault on an axis by assigning a
value of 0 to the appropriate Position_error_fault variable using an
Equation block. However, this does not automatically re-enable feedback
or the drive. If the position error of the axis is still greater than the
position error tolerance, after executing the Equation block, the fault
occurs again immediately. A position error fault is also cleared when a
Feedback On or Home Axis block is executed, or when the setup menus
in the motion controller are run. See Setup in the Installation and Setup
manual for your motion controller for more information on the setup
menus.
Hardware Overtravel Fault
Hardware_overtravel_fault (sometimes called Hardware Travel Limits
Fault) is a logical (Boolean) variable which has values of:
•
1 (true) if either the positive or negative overtravel input for the
specified axis was activated
•
0 (false) if not
In the Tag Explorer, select both Axis System Variables and the desired
physical axis, then select Hardware_overtravel_fault in the Tag Window.
When evaluated in an expression, the value of the
Hardware_overtravel_fault variable indicates whether or not a hardware
overtravel fault has occurred on a specific axis.
When Hardware_overtravel_fault = 1, Axis_fault = 3, Axis_status = 9 if
no other faults of higher priority are active on the axis, and Global_fault =
3 if no other faults of higher priority are active on any axis.