Omron CP1L Operation Manual page 213

High-speed Counters
Up/Down Mode
Increment pulse
Decrement pulse
Increment Mode
Pulse
Conditions for Incrementing/Decrementing the Count
Direction
signal
↑
H
↓
L
L
↑
H
↓
• 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.
The up/down mode uses two signals, an increment pulse input and a decre-
ment pulse input.
0 1 2 3
Conditions for Incrementing/Decrementing the Count
Decrement
pulse
↑
H
↓
L
L
↑
H
↓
• The count is incremented for each increment pulse input and decre-
mented for each decrement pulse input.
• Only up-differentiated pulses (rising edges) can be counted.
The increment mode counts single-phase pulse signal inputs. This mode only
increments the count.
0 1 2 3 4
Conditions for Incrementing/Decrementing the Count
Pulse
↑
H
↓
L
Pulse
signal
L No change
↑
Increment
H No change
↓
No change
↑
Decrement
H No change
↓
No change
L No change
4 5 6 7 8
Increment
pulse
L Decrement
↑
Increment
H No change
↓
No change
↑
Increment
H Decrement
↓
No change
L No change
5 6 7 8
Count value
Increment
No change
No change
No change
Count value
7 6 5 4
Count value
9 10 11 12 13 14
Section 5-1
3 2 1 0
15 16
179