HEIDENHAIN TNC 335 Technical Manual - Manual (Page 146)

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TNC 360 2 Reference Marks 4-49
MP1350 Type of reference mark approach
Entry: 0 = measuring system with distance-coded reference marks
1 = measuring system with one reference mark
2 = special sequence (linear measurement via rotary encoder)
MP1350.0 X axis
MP1550.1 Y axis
MP1350.2 Z axis
MP1350.3 4th axis
Marker Function Set Reset
M2556 Reference end position for X axis PLC PLC
M2557 Reference end position for Y axis
M2558 Reference end position for Z axis
M2559 Reference end position for 4th axis
Address Function Set Reset
W272 Operating mode NC NC
0 = Programming and editing
1 = Manual operation
2 = Electronic handwheel
3 = Positioning with manual entry
4 = Program run, single block
5 = Program run, full sequence
6 = Test run
7 = Pass over reference points
2.2 Machine datum
The reference mark defines a point on the measuring system. The reference points of all axes define
the scale datum. All REF-based displays and positioning movements refer to the machine datum
(see also section "Display and operation").