Rockwell-automation 1771-DE Absolute Encoder Module User Manual Manuale Utente Scaricare il pdf (Pagina 56)

Appendix B

BĆ3

Figure B.2

Encoder Operating at T

ypical Speed (60 RPM)

400

(Shaft Position)

Encoder LSB

(Bit 0)

New

Position

Throughput

Time

Output Bit

(000) (001) (002)

2.8 ms

13307

μs

The first waveform of Figure B.1 and Figure B.2 represents the least

significant bit (LSB), or bit 0, of a BCD or binary encoder. The LSB

changes with every change in encoder position (one increment of shaft

rotation). This bit has the highest input frequency of all encoder channels

because it changes state most often. Although the LSB on standard Gray

encoders does not toggle with each increment in shaft position, circuitry

on the module converts the Gray code to binary code to be used by the

module.

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Rockwell-automation 1771-DE Absolute Encoder Module User Manual Manuale Utente Pagina 56