HEIDENHAIN iTNC 530 (340 49x-01) ISO programming - Manual (Page 452)

452 10 Programming: Q Parameters
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Spindle status: Q110
The value of Q110 depends on which M function was last
programmed for the spindle:
Coolant on/off: Q111
Overlap factor: Q112
The overlap factor for pocket milling (MP7430) is assigned to Q112.
Unit of measurement for dimensions in the
program: Q113
The value of parameter Q113 specifies whether the highest-level NC
program (for nesting with %...) is programmed in millimeters or
inches.
Tool length: Q114
The current value for the tool length is assigned to Q114.
M Function Parameter value
No spindle status defined Q110 = –1
M03: Spindle ON, clockwise Q110 = 0
M04: Spindle ON, counterclockwise Q110 = 1
M05 after M03 Q110 = 2
M05 after M04 Q110 = 3
M Function Parameter value
M08: Coolant ON Q111 = 1
M09: Coolant OFF Q111 = 0
Dimensions of the main program Parameter value
Metric system (mm) Q113 = 0
Inch system (inches) Q113 = 1