Mitsubishi Electric MELSEC iQ-R16MTCPU Programming Manual page 190

■When the end point of arc is not on the arc
When the difference between the start point radius and the end point radius is within range, circular interpolation connects to
the commanded end point in the shape of a spiral. When outside the range for arc deviation, a minor error (error code: 1FC3H
(details code: 0313H)) occurs.
: Program path,
Arc for end point radius
Compensation
Arc center
■When an inside intersection does not exist
Depending on the compensation amount, an intersection between arc A and arc B may not exist. (Example 2 below)
In this case, at the end of the previous block, a minor error (error code: 1FC3H (details code: 031DH)) occurs.
In example 1 below, the compensation amount is small, thus an intersection exists and the work can be processed. However,
example 2 has a large compensation amount thus an intersection does not exist, and work cannot be processed.
: Program path,
<Example 1>
Arc center
Compensation
<Example 2>
Arc center
Compensation
6 AUXILIARY AND APPLIED FUNCTIONS
188
6.4 Tool Compensation Function
: Tool center path, : Tangent to the arc at intersection,
Compensation
Single block stopping point
End point radius after compensation
: Tool center path
Arc center
Arc A Arc B
Compensation
Minor error occurrence
Arc center
Compensation
Arc A Arc B
: Parallel line to program path