213
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
0123
1112 11 1010 99 8 88 7 77 666 555 444 333 222 11 0
Phase-A
Phase-B
Count
Phase A Phase B Count value
↑ LIncrement
H ↑ Increment
↓ HIncrement
L ↓ Increment
L ↑ Decrement
↑ HDecrement
H ↓ Decrement
↓ LDecrement
22
1
1
0
0
7 6876
55
44
33
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
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