LSIS XBC-DR14E - Page 252

Chapter 10 DC Input Option Board
10 - 6
b) Increasing/decreasing count operation by B-phase input signal
•1-phase 2-input 1-multiplication
A-phase input pulse is counted at rising and increasing/decreasing will be decided by B-phase.
Increasing/Decreasing
classification
A-phase input pulse
rising
A-phase input pulse
falling
B-phase input pulse Off
Increasing count
-
B-phase input pulse On
Decreasing count
-
• Operation example
2) 2-phase count mode
a) 2-phase 2-multiplication
A-phase input pulse and B-phase input pulse are counted at rising respectively. If A-phase input
is antecedent to B-phase input, increasing operation starts, and if B-phase input is antecedent to
A-phase input, decreasing operation starts.
• Operation example
Increasing
Decreasing
2
3
4
5
6
7
8
9
8
7
6
5
4
3
B-phase input pulse
Count value
A-phase input pulse
Increasing
Decreasing
Increasing
B-phase input pulse
Count value
7
8
9
10
9
8
7
8
Off
On
A-phase input pulse
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