Encoders And Reference Marks - HEIDENHAIN ND 282B User Manual

Measured value displays

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Position Encoders and Reference Marks

The ND 282 B display unit is designed for use with photo-

electrical linear encoders with 11 µA

primarily for HEIDENHAIN MT length gauges with 11 µA

The MT length gauges have one reference mark. The scales

of other photoelectric linear encoders (see "Linear Encod-

ers") can contain one reference mark or many distance-

coded reference marks.

If there is an interruption of power, the relationship between

the position of the length gauge and the displayed position

value is lost. The reference marks on the position encoders

and the REF reference mark evaluation feature enable the

display unit to quickly reestablish this relationship again

when the power is restored.

When a reference mark is crossed over, a signal is generated

which identifies that position as a reference point. At the

same time, the display unit restores the relationship be-

tween length gauge position and display values which you

last defined by setting the datum.

To restore the datum on scales with distance-coded refer-

ence marks, you only need to traverse a maximum of 20 mm

for linear encoders.

sinusoidal signals:

Scale in

linear encoder

Reference mark

Reference marks on linear encoders

Distance-coded

reference marks

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