Machine Datum - HEIDENHAIN iTNC 530 HSCI Technical Manual

8.1.9 Machine datum

July 2013
The machine is built with a fixed machine datum. All referenced displays and
positioning blocks refer to this machine datum.
In the Manual and Electronic Handwheel operating modes you can define a
workpiece datum with the "datum setting" function. NC programming blocks
are entered with respect to this defined datum.
Other datums:
If the user programs M91 in an NC program, the NC programming block

refers to the machine datum.
In MP960.x, enter the distance between the machine datum and the scale

reference point.
All NC programming blocks are referenced to the machine datum.

With MP7295, disable the "datum setting" function for specific axes.

NC programming block values are defined with respect to fixed positions of

the machine if the user programs M92 in the NC program.
In MP950.x, enter the distance between the machine datum and the

machine-referenced position. The values for MP950.x can be assumed with
the "actual position capture" key.
RM
RM
Workpiece datum
Scale reference point
Note
M91 and M92 are active only in the block in which they are programmed.
8.1 Display and operation
RM
Machine datum
RM = Reference mark
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