Yaskawa JAPMC-MC2300 - Manual (Page 70)

4.4 General-purpose I/O Mode
4.4.4 Pulse Input Modes
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4.4.4 Pulse Input Modes
The following three pulse input modes are supported in general-purpose I/O mode of the SVA-01 Module.
• Sign mode
• Up/Down mode
• Pulse A/B mode
Each pulse input mode is explained below.
( 1 ) Sign Mode
In sign mode, the counter counts pulses in the following manner.
Polarity: Positive logic
When pulse B is at High, the counter counts up upon pulse A input.
When pulse B is at Low, the counter counts down upon pulse A input.
Polarity: Negative logic
When pulse B is at Low, the counter counts up upon pulse A input.
When pulse B is at High, the counter counts down upon pulse A input.
The table below shows different pulse counting operations by combination of multiplier and polarity.
( 2 ) Up/Down Mode
In up/down mode, the counter counts pulses in the following manner no matter whether the polarity is positive or neg-
ative logic.
The counter counts up upon pulse A input.
The counter counts down upon pulse B input.
The table below shows different pulse counting operations by combination of multiplier and polarity.
When pulse A and B are input at the same time, the count will not change ( ±0).
Pulse Counting Method Polarity Count Up (Forward Rotation) Count Down (Reverse Rotation)
Sign mode
(Input pulse multiplier: 1)
Positive
logic
Negative
logic
Sign mode
(Input pulse multiplier: 2)
Positive
logic
Negative
logic
Pulse A
Pulse B
HIGH
Pulse A
Pulse B
LOW
Pulse A
Pulse B
LOW
Pulse A
Pulse C
HIGH
Pulse A
Pulse B
HIGH
Pulse A
Pulse B
LOW
Pulse A
Pulse B
LOW
Pulse A
Pulse B
LOW
Pulse Counting Method Polarity Count Up (Forward Rotation) Count Down (Reverse Rotation)
Up/Down mode
(Input pulse multiplier: 1)
Positive
logic
Negative
logic
Up/Down mode
(Input pulse multiplier: 2)
Positive
logic
Negative
logic
Pulse A
Pulse B Fixed to LOW or HIGH
Pulse A
Pulse B
Fixed to LOW or HIGH
Pulse A
Pulse B Fixed to LOW or HIGH
Pulse A
Pulse B
Fixed to LOW or HIGH
Pulse A
Pulse B Fixed to LOW or HIGH
Pulse A
Pulse B
Fixed to LOW or HIGH
Pulse A
Pulse B Fixed to LOW or HIGH
Fixed to LOW or HIGH Pulse A
Pulse B