Rockwell-automation 1771-DE Absolute Encoder Module User Manual Manuel d'utilisateur télécharger pdf (Page 55)

Appendix B

BĆ2

In the first sample (Figure B.1), we assume that the encoder shaft is

turning close to the maximum allowable shaft sped according to the above

equation. The shaft is in each discrete position for only 220 us, giving

360 increments (or one revolution) every 79 ms. This is equal to about

758 rpm.

In the second example (Figure B.2), we assume a more typical shaft speed

of 60 rpm, or one revolution per second. The encoder spends about 2.8

ms in each discrete position.

Figure B.1

Encoder

Operating Near Maximum Speed (758 RPM)

(Shaft Position)

Encoder LSB

(Bit 0)

New

Position

Throughput

Time

Output Bit

(000) (001) (002)

200

CD E

13306

μs

1 2 ... 50 51 52 53 54 55 56 57 58 59 60 ... 79 80

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Rockwell-automation 1771-DE Absolute Encoder Module User Manual Manuel d'utilisateur Page 55