Heidenhain ND 522 User Manual download pdf (Page 15)

ND 522/523 15

I - 1 Fundamentals of Positioning

Encoder Reference Marks

Encoders normally contain one, or more reference marks which the

ND 522/523’s Reference Mark Evaluation feature uses to re-establish

datum positions after a power interruption. There are two main

options available for reference marks; fixed, and distance-coded.

Encoders with distance-coded reference marks have marks

separated by a specific encryption pattern that allows the ND 522/523

to use any two pair of marks along the length of the encoder to re-

establish the prior datums. This configuration means that the operator

only has to travel a very short distance, any where along the encoder,

to re-establish the datums when the ND 522/523 is turned back on.

Encoders with fixed reference marks have one, or more marks on

fixed intervals. To re-establish the datums correctly, it is necessary to

use the same exact reference mark, during the Reference Mark

Evaluation routine, that was used when the datum was first

established.

The established datums’ cannot be restored from one

power cycle to the next if the reference marks were not

crossed before the datums were set.

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Heidenhain ND 522 User Manual Page 15