Siemens High Speed Counter and Encoder Module SIMATIC 505 Manual de usuario Pagina 16

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Overview
1-10
Series
505 High Speed Counter
and Encoder Module User
s Manual
Counting Modes (continued)
1.5.5
4X
Quadratur
e
If input A leads input B, the module counts up on rising and falling edges
of both input A and input B. If input B leads input A, the module counts
down on the rising and falling edges of input A and input B.
Figure 1-7 shows the relationship between inputs A and B and the count
value in the 4X
quadrature mode.
4X Quadrature
12 34 5 6 7 8 7 65 4 32 10
A
B
25 s
min
Counts Up
(A Leading)
Count V
alue
Counts Down
(B Leading)
26.7
s
min
Figure 1-7
4X
Quadrature Mode
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