Rockwell Automation GMLC Reference Manual - Manual (Page 295)

Publication GMLC-5.2 - November 1999
258 Motion Blocks
To allow rejecting spurious registration events, specify a tolerance around
the target position by selecting Tolerance, and enter a value or expression
equal to the desired target position tolerance in the data entry box. The
specified tolerance is interpreted as a ± quantity around the Absolute
Target Position and used to distinguish good registration events from bad
ones, as shown below.
As shown above, the first registration event that occurs within the
specified tolerance is considered the good registration. All registration
events that occur after a good registration event and before the beginning
of the next tolerance area are considered bad, even if they occur within
the current tolerance. If Tolerance is not selected, all registration events
on the registering axis are considered good.
!
ATTENTION: Using auto-correction to correct large
errors can cause harsh motion and result in damage to
both equipment and materials.
Tolerance
Axis Position
Target
Position
+ –
Programmed
Tolerance
Value
Registration
Input
Bad
Registrations
Good
Registration
Bad
Registrations