Siemens High Speed Counter and Encoder Module SIMATIC 505 User Manual Page 15

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Overview
1-9
Series
505 High Speed Counter
and Encoder Module User
s Manual
1.5.4
2X
Quadratur
e
If input A leads input B, the module counts up on both the rising and
falling edges of input A. If input B leads input A, the module counts down
on the rising and falling edges of input A.
Figure 1-6 illustrates the relationship between inputs A and B and the
count value in the 2X quadrature mode.
2X Quadrature
1234 3210
A
B
25 s
min
Counts Up
(A Leading)
Counts Down
(B Leading)
Count V
alue
26.7
s
min
Figure 1-6
2X
Quadrature Mode
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