Omron CP1H CPU UNITS - PROGRAMMING 05-2007, Operation Manual

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211
High-speed Counters
Section 5-2
Counter Input Modes
Differential Phase Mode
(4x) 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.
Conditions for Incrementing/Decrementing the Count
Pulse + Direction Mode 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.
Conditions for Incrementing/Decrementing the Count
• 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.
Reset Bit Used for the PV software reset. A531.00 A531.01 A531.02 A531.03
High-speed Counter Gate
Bit 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. A531.08 A531.09 A531.10 A531.11
Function High-speed counter number
0 1 2 3
11 12 11 10 10 9 9 8 8 8 7 7 7 6 6 6 5 5 5 4 4 4 3 3 3 2 2 2 1 1 0
Phase-A
Phase-B
Count
Phase A Phase B Count value
↑
L Increment
H
↑
Increment
↓
H Increment
L
↓
Increment
L
↑
Decrement
↑
H Decrement
H
↓
Decrement
↓
L Decrement
2 2 1 1 0 0 7 6 8 7 6 5 5 4 4 3 3
Pulse
Direction
Direction
signal
Pulse
signal
Count value
↑
L No change
H
↑
Increment
↓
H No change
L
↓
No change
L
↑
Decrement
↑
H No change
H
↓
No change
↓
L No change