Mitsubishi Electric MELSEC-LD77MS2 User Manual page 186

Allowable circular interpolation error width
Pr.41
The allowable error range of the calculated arc path and end point address is set.
1
If the error of the calculated arc path and end point address is within the set
range, circular interpolation will be carried out to the set end point address while
compensating the error with spiral interpolation.
The allowable circular interpolation error width is set in the following axis buffer
memory addresses.
(Example)  If axis 1 is the reference axis, set in the axis 1 buffer memory
addresses [60, 61].

If axis 4 is the reference axis, set in the axis 4 buffer memory
addresses [510, 511].
Path with spiral interpolation
Start point address
1: With circular interpolation control using the center point designation, the arc
path calculated with the start point address and center point address and the
end point address may deviate.
setting value
Pr.1
0 : mm
1 : inch
2 : degree
3 : PLS
Chapter 5 Data Used for Positioning Control
Center point address
Value set with GX Works2
(unit)
0 to 10000.0 (  m)
0 to 1.00000 (inch)
0 to 1.00000 (degree)
0 to 100000 (PLS)
5 - 46
Error
End point address
with calculation
End point address
Value set with sequence program
(unit)
0 to 100000 (  10
0 to 100000 (  10
0 to 100000 (  10
0 to 100000 (PLS)
-1
 m)
-5
inch)
-5
degree)