Rockwell-automation 1771-DE Absolute Encoder Module User Manual Manuel d'utilisateur télécharger pdf (Page 77)

Appendix

FĆ1

Glossary

This glossary defines terms pertaining to Allen–Bradley Absolute

Encoder Modules. For abroader glossary of programmable controller

words, refer to our Programmable Controller Terms (publication no.

PCGI–7.2).

ABSOLUTE ENCODER:

An encoder with a unique digital output code for each increment of shaft

rotation

BIDIRECTIONAL BLOCK TRANSFER:

The performance of alternating read and write operations between an

intelligent I/O module and the processor data table

DIFFERENTIAL OUTPUT ENCODER:

An encoder using differential line driver output devices that have a bit x

and bit x

output signals

ENCODER DATA SETTLING TIME:

The time required for encoder data to settle to reflect a new position

GRAY CODE:

A binary numbering system modified so that only 1 bit changes as the

counting number increases.

MAXIMUM ENCODER SHAFT SPEED:

The maximum speed at which the encoder shaft can turn to give a

one–count resolution while controlling a particular number of outputs.

NEW POSITION THROUGHPUT TIME:

The time between a certain state being applied to the input terminals and

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Rockwell-automation 1771-DE Absolute Encoder Module User Manual Manuel d'utilisateur Page 77