Omron CP1H-CPU - 05-2006 Operation Manual page 238

High-speed Counters
Reset Bit
High-speed Counter Gate
Bit
Counter Input Modes
Differential Phase Mode
(4x)
Phase-A
Phase-B
Count
0
Pulse + Direction Mode
Pulse
Direction
Function
Used for the PV software reset.
When a counter's Gate Bit is ON, the counter's
PV will not be changed even if pulse inputs are
received for the counter.
The differential phase mode uses two phase signals (phase A and phase B)
and increments/decrements the count according to the status of these two
signals.
1 2 3 4 5 6 7 8 9 10 11
Conditions for Incrementing/Decrementing the Count
Phase A Phase B
L
H
H
L
L
H
H
L
The pulse + direction mode uses a direction signal input and pulse signal
input. The count is incremented or decremented depending on the status (ON
or OFF) of the direction signal.
0 1 2 3 4 5
Conditions for Incrementing/Decrementing the Count
Direction
signal signal
L
H
H
L
L
H
H
L
• The count is incremented when the direction signal is ON and decre-
mented when it is OFF.
• Only up-differentiated pulses (rising edges) can be counted.
A531.00
A531.08
12 11 10 9 8 7 6 5 4 3
Count value
Increment
Increment
Increment
Increment
Decrement
Decrement
Decrement
Decrement
6 7 8 7 6
Pulse Count value
No change
Increment
No change
No change
Decrement
No change
No change
No change
Section 5-2
High-speed counter number
0 1 2
A531.01 A531.02
A531.09 A531.10
2 1 2 3 4 5 6 7 8
5 4 3 2 1 0
3
A531.03
A531.11
207