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Allen-Bradley Micro800 2080-MEMBAK-RTC2 - Page 41

Allen-Bradley Micro800 2080-MEMBAK-RTC2
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Rockwell Automation Publication 2080-UM004D-EN-E - March 2018 31
High Speed Counter – 2080-MOT-HSC Chapter 4
Quadrature Counting
Quadrature X4 Counter
Counter shall increment or decrement on each edge of the A and B pulses when
the signal is in the positive or negative direction respectively. See previous
illustration.
Quadrature X2 Counter
The counter increments or decrements on each edge of the A pulse when the
signal is in the positive or negative direction respectively. See previous illustration.
Down Counter
Pulses on A will cause the down counter (Counter 0). Also pulses on B will cause
the down counter (Counter 1).
INPUT A
INPUT B
INPUT Z
Quadrature
Encoder
A
B
X1
Count
X2
Count
1
2
3
4
5
6
7
8
9
10
11
12
11
10
9
8
7
6
5
4
3
2
1
0
X4
Count

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