Rockwell Automation 1771-DE Absolute Encoder Module User Manual - Manual (Page 56)

Appendix B
BĆ3
Figure B.2
Encoder Operating at Typical Speed (60 RPM)
400
(Shaft Position)
Encoder LSB
(Bit 0)
New
Position
Throughput
Time
Output Bit
(000) (001) (002)
2.8 ms
13307
μ s
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.