Encoders; Signal Period - HEIDENHAIN iTNC 530 Technical Manual

6.1.3 Encoders

Signal period

6 – 6
Position encoders report positions and movements of the machine to the
control. The iTNC 530 operates with incremental and absolute encoders with
EnDat interface.
For any given distance the position encoder outputs a fixed number of signal
periods. The signal is subdivided by 1024.
To calculate the signal period, the control requires the following data:
7
In MP331.x, enter for each axis the length required for the number of signal
periods given in MP332.x.
7 In MP332.x, enter for each axis the number of signal periods for the length
given in MP331.x.
From these data the iTNC calculates the quotient:
MP331.x
----------------------- -
Signal period =
MP332.x
Note
Digital axes:
If no position encoder (MP110.x = 0) is connected, the data of the speed
encoder must be entered in MP331.x and MP332.x. This also applies to
speed encoders with an EnDat interface, since the incremental track of the
speed encoder is used for position feedback control.
HEIDENHAIN offers incremental linear encoders with distance-coded
reference marks. The nominal increment between two fixed reference marks
depends on the encoder being used:
7 In MP334.x, enter for each axis the nominal increments between two fixed
reference marks.
If the number of grating periods between the reference end position and the
first reference mark exceeds the value from MP334.x, the error message Ref
mark <axis>: incorrect spacing appears. This monitoring is turned off with
MP334.x = 0.
HEIDENHAIN Technical Manual iTNC 530