Rockwell Automation 1771-DE Absolute Encoder Module User Manual - Manual (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)
25
(Shaft Position)
Encoder LSB
(Bit 0)
New
Position
Throughput
Time
Output Bit
(000) (001) (002)
200
A
B
C D E
13306
μ s
μ s