Rockwell Automation GMLC Reference Manual - Manual (Page 526)

Publication GMLC-5.2 - November 1999
489
The calculation of the PCAM_registration_error value differs depending
on the type of auto-correction used. For absolute and absolute ratioed
auto-correction, the registration error is the difference between the most
recent hard or soft registration position of the axis, and the target position
as shown below.
The registration error is returned in the position units of the corresponding
master axis of the position-lock cam for absolute auto-correction, and in
the position units of the corresponding registering axis for absolute
ratioed auto-correction.
For relative and relative ratioed auto-correction, the registration error is
the difference between measured registration distance of the axis and the
nominal length, as shown below.
Registration
Position
∑
•
+
–
Target
Position
Registration
Error