IDEC FT1A Series - Page 102

5: S PECIAL F UNCTIONS
5-14 S MART AXIS P RO /L ITE U SER ' S M ANUAL FT9Y-B1378
High-speed Counter External Inputs
The SmartAXIS can use a maximum of six single-phase high-speed counters and a maximum of two two-phase high-speed
counters. The 12-I/O type can only use a maximum of four single-phase high-speed counters and a maximum of two dual-phase
high-speed counters.
Single-phase high-speed counter
The 24-, 40-, and 48-I/O types can use external inputs I6 and I7 as single-phase the high-speed counters.
The 12-I/O type cannot use external inputs I6 and I7 as single-phase high-speed counters. External inputs I6 and I7 are normal
inputs.
Note: Can only be used when the counting mode is specified as the up/down selection reversible counter.
Two-phase high-speed counter
External inputs I0/I1 (group 1) and I3/I4 (group 3) can be used as two-phase high-speed counters. External inputs I2 and I5 can
be used as external clear inputs for group 1 and group 3. In this situation, external inputs I2 and I5 cannot be used as single-
phase high-speed counters.
Note: If not used as the external clear input (Z-phase), group 2 and group 4 can be used as single-phase high-speed counters.
Group 123456
External input I0 I1 I2 I3 I4 I5 I6 I7
Single-phase
high-speed
counter
Pulse input
Up/down
selection
input (Note)
Pulse input/
external
clear input
Pulse input
Up/down
selection
input (Note)
Pulse input/
external
clear input
Pulse input Pulse input
Group 123456
External input I0 I1 I2 I3 I4 I5 I6 I7
Two-phase
high-speed
counter
Pulse input
(A-phase)
Pulse input
(B-phase)
External
clear input
(Note)
(Z-phase)
Pulse input
(A-phase)
Pulse input
(B-phase)
External
clear input
(Note)
(Z-phase)
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