YASKAWA MP2000 Series User Manual page 70

( 3 ) Pulse A/B Mode
In pulse A/B mode, the counter counts pulses in the following manner.
Polarity: Positive logic
The counter counts up when the phase of pulse A input is delayed from pulse B.
The counter counts down when the phase of pulse A input is advanced to pulse B.
Polarity: Negative logic
The counter counts up when the phase of pulse A input is delayed from pulse B.
The counter counts down when the phase of pulse A input is advanced to pulse B.
The table below shows different pulse counting operations by combination of multiplier and polarity.
Pulse Counting Method
Pulse A/B mode
(Input pulse multiplier: 1)
Pulse A/B mode
(Input pulse multiplier: 2)
Pulse A/B mode
(Input pulse multiplier: 4)
Polarity Count Up (Forward Rotation)
Positive
Pulse A
logic
Pulse B
Pulse A
Negative
logic
Pulse B
Positive
Pulse A
logic
Pulse B
Pulse A
Negative
Pulse B
logic
Positive
Pulse A
logic
Pulse B
Pulse A
Negative
logic
Pulse B
4.4 General-purpose I/O Mode
4.4.4 Pulse Input Modes
Count Down (Reverse Rotation)
Pulse A
Pulse B
Pulse A
Pulse B
Pulse A
Pulse B
Pulse A
Pulse B
Pulse A
Pulse B
Pulse A
Pulse B
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