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B-40
|
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Appendix B
Timing Diagrams
Quadrature and Two Pulse Encoder Timing
Counter
n
A, Counter
n
B, and Counter
n
Z, described in the
Counter n A, Counter n B, and
Counter n Z Signals
section of Chapter 7,
Counters
, are used in position measurements using
quadrature encoder or two-pulse encoder counting modes. Table B-35 shows the timing
requirements for these signals.
Figure B-51.
Quadrature and Two Pulse Encoder Timing Diagrams
Table B-35.
Quadrature and Two Pulse Encoder Timing
Time
Description
Min (ns)
*
Max (ns)
t
14
Counter
n
A Period
50.0
—
t
15
Counter
n
A Pulse Width
25.0
—
t
16
Counter
n
B Period
50.0
—
t
17
Counter
n
B Pulse Width
25.0
—
t
18
Counter
n
Z Pulse Width
25.0
—
t
19
Delay from Counter
n
A to Counter
n
B
25.0
—
t
20
Delay from Counter
n
B to Counter
n
A
25.0
—
*
The times in this table are measured at the pin of the M Series device. For example, t
14
specifies the
minimum period of a signal driving a PFI, RTSI, or PXI_STAR pin when that signal is internally routed
to Counter
n
A.
Counter n A
t
15
Counter n Z
t
15
t
14
Counter n B
t
17
t
17
t
16
t
19
t
18
t
20
t
18
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