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14 datum correction, Shift correction – HEIDENHAIN TNC 407 (243 020) Technical Manual User Manual

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01.98

TNC 407/TNC 415/TNC 425

14 Datum correction

4-221

14 Datum correction

The PLC datum correction function is used to shift the zero or datum point with the PLC program.

Each axis (X, Y, Z, 4, 5) is assigned a double word (D528 to D544) for the correction value. The
datum correction is activated by Marker M2716 during a strobe. The correction is computed in the
actual value display; the display then relates to the shifted coordinate system.

Example:

Actual position display for X axis without correction = 50
Correction in D528 = +20

Strobe marker M2716 set, i.e. correction is active
New actual position display X= +70

The corrections can be transferred to double words, D528 to D544, from different memory areas:

- Enter values in MP4210.0 to MP4210.47 and they will also be in D768 to D956; now copy values

via PLC program into D528 to D544.

- Define corrections in the NC program in function FN19 and they will also be in D280 or D284 (see

description of FN19); now copy values via PLC program into D528 to D544.

A description of the machine geometry via machine parameters MP7510 and following (e.g. cylinder
surface) must have the same reference position as any datum shift.

Address

Function

D528

Datum correction for X axis

D532

Datum correction for Y axis

D536

Datum correction for Z axis

D540

Datum correction for IV axis

D544

Datum correction for V axis

Marker

Function

M2716

Strobe marker for datum correction