IDEC FT1A Series - Page 104

5: S PECIAL F UNCTIONS
5-16 S MART AXIS P RO /L ITE U SER ' S M ANUAL FT9Y-B1378
Counting mode
The high-speed counter as the following four counting modes.
• Adding counter (single-phase high-speed counter)
The adding counter counts up with the rise in pulse input.
• Up/down selection reversible counter (single-phase high-speed counter)
Up/down selection reversible counter can switch between addition and subtraction by pulse input with the up/down selection
input. When the up/down selection input is on, the counter counts up with the rise in pulse input. When the up/down selection
input is off, the counter counts down with the rise in pulse input.
• 2-edge count (two-phase high-speed counter)
This counter counts by the phase difference between the A-phase and B-phase pulse input. When the A-phase precedes the B-
phase, the counter counts up with the rise and fall of the B-phase. When the B-phase precedes the A-phase, the counter counts
down with the rise and fall of the B-phase.
• 4-edge count (two-phase high-speed counter)
This counter counts by the phase difference between the A-phase and B-phase pulse input. When the A-phase precedes the B-
phase, the counter counts up with the rise and fall of the A-phase and the B-phase. When the B-phase precedes the A-phase, the
counter counts down with the rise and fall of the A-phase and the B-phase.
10 11 12 13 14
Current value
Pulse input
(I0, I2, I3, I5, I6, I7)
10 11 12 11 10
Current value
Up/down selection
input (I1, I4)
Pulse input
(I0, I3)
01 1 0 22334
B-phase
Current
value
A-phase
0 1234567 7654321 08
Current
value
B-phase
A-phase