HEIDENHAIN TNC 407 (243 020) Technical Manual User Manual
Page 132
4-7
For linear measurement systems in combination with the interpolation and digitising electronics EXE
for the square-wave signal inputs X5 (TNC 407) and X6 (TNC 407/TNC 415) the interpolation factor of
the EXE must be taken into account:
Signal period (
) =
grating period
interpolation factor
For linear measurement by rotary encoder and ballscrew:
Signal period (
) = ballscrew pitch [mm] • 1000 [mm / mm] line count ·
1
interpolation factor
The TNC always does a 4-fold evaluation of the signals at the square-wave inputs.
If a counting step < 1
µ
m or
1
1000
°
is desired, the signal period (
) must not be greater than
4
µ
m or
4
1000
°.
Only on the TNC 407 is it possible in MP340 to enter the interpolation factor of the external
electronics (EXE) at the encoder input X5 or X6. The TNC needs this information in order to be able
to determine the absolute position when encoders with distance-coded reference marks are used.
The interpolation factor is entered individually for each axis.
Angular measurement: For angular measurement systems the signal period is calculated as
follows:
signal period (~) =
360°
line count
· 1000
or
signal period (
) =
360°
line count
·
1
interpolation factor
· 1000
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 range 0.1 to 100 in [
µ
m] or
[
1°
1000
]
MP330.0
X axis
MP330.1
Y axis
MP330.2
Z axis
MP330.3
4th axis
MP330.4 5th
axis