Rockwell Automation 8520-ARM2 9/Series CNC AMP Reference Manual Documentation Set - Manual (Page 295)

Feedrate Parameters
Chapter 9
9-13
Function
Use this parameter to enter the amount of inaccuracy permitted when
programming the creation of an arc. The control takes the distance from
the start-point of the arc to the center-point, and the distance from the
end-point of the arc to the center-point, and determines the difference
between these two distances.
If the difference between these two lengths is greater than the value entered
for this parameter, the control generates an error.
This error is normally generated when using I, J, K to program the arc
center. When using an R to program the arc center, the only time this error
may occur is if the distance between the start-point and end-point of the arc
is more than twice the programmed radius.
Axis Parameter Number
Single Process Process 1 Process 2
All [411] [20411] [21411]
Range
0.00000 to 25.40000 mm
or
0.00000 to 1.00000 inch
Notes
This is a global parameter. The value set here applies to all axes.
For Dual Processing controls, these are per process parameters. The values
set in the parameters apply to all of the axes assigned to that process.
END OF CHAPTER
9.5
Circular Error Tolerance
Limit