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10. PLC Help Function
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10.6 External Machine Coordinate System Compensation
External machine coordinate system compensation is executed by setting compensation data
(absolute amount) in the PLC file register (R) for each axis.
Thus, the compensation timing is when PLC rewrites file register (R) compensation data. Necessary
condition, timing, etc., are set by user PLC.
The interface between user PLC and CNC is shown below.
File register
Contents
R560
Compensation data for the first axis
R561
Compensation data for the second axis
R562
Compensation data for the third axis
R563 Compensation data for the forth axis
R564 —
R565 —
R566 —
R567 —
Data in file registers R560~R567 is not backed up. If it must be backed up, use back-up file
registers (R1900~R2799).
(Note 1)
The maximum delay to compensation is (one user PLC scan + 15ms). However,
smoothing time constant and servo follow delay are not contained.