HEIDENHAIN TNC 335 Technical Manual - Manual (Page 103)

4-6
TNC 360 1 Machine Axes 8/95
In addition to the signal period, MP 310 can also set a signal subdivision that can be 1-, 2-, 4-, or 256-
fold and should be entered so that in combination with the signal period (MP 330) a display step of 1
µm is achieved. For example, a 4 µm signal period and 4-fold subdivision yields a display step of 1
µm, a 20 µm signal period and 4-fold subdivision results in a display step of 5 µm. In order to attain a
1 µm display step from a 20 µm signal period, you must enter a subdivision factor of 256. The
control internally rounds the result of the division 20 µm/256 up to 1 µm.
The signal at the square-wave input (Spindle input X6) undergoes a control-internal 4-fold evaluation.
Machine parameter MP 340 was introduced to permit including an external signal interpolation via
EXE, or IBV. This information is needed in order to determine the absolute position with scales
featuring distance-coded reference marks. In machine parameter MP340 must defined whether the
ballscrew encoder has 2048 or 4096 lines.
Angular measurement: The signal period for angular measuring system is calculated as follows:
Signal period (~) =
360°
line count
· 1000
MP310 Signal subdivision
Entry: 0 to 3
0 = 256-fold
1 = 4-fold
2 = 2-fold
3 = 1-fold
MP 310.0 Signal subdivision axis X
MP 310.1 Signal subdivision axis Y
MP 310.2 Signal subdivision axis Z
MP 310.3 Signal subdivision 4th axis
If the angular measurement is made by gearing up or down this must be taken into account when
calculating the signal period.
MP330 Signal period
Entry: 0.100 to 999.999 [
µ
m] or
[ 1°
1000
]
MP330.0 Axis X
MP330.1 Axis Y
MP330.2 Axis Z
MP330.3 4th axis
MP340 Interpolation factor of the EXE at X6
Entry: 0 to 5
0 = No measuring system on X6
1 = EXE without interpolation
2 = Spindle encoder with 2048 lines
3 = Spindle encoder with 4096 lines
5 = EXE with 5-fold interpolation