4 Special Functions
3-56 SmartAXIS Touch User's Manual
● High-speed Counter External Inputs
The 12-I/O type can only use a maximum of four single-phase high-speed counters and a maximum of one dual-
phase high-speed counter.
■ Single-phase high-speed counter
The 12-I/O type cannot use external inputs I0 and I1 as single-phase high-speed counters.
■ Two-phase high-speed counter
External inputs I0/I1 (group 1) can be used as two-phase high-speed counters. External inputs I2 can be used as
external clear inputs for group 1. In this situation, external inputs I2 cannot be used as single-phase high-speed
counters.
*1 If not used as the external clear input (Z-phase), group 2 can be used as single-phase high-speed counters.
Group 12345
External input I0 I1 I2 I3 I4 I5
Single-phase
high-speed
counter
– – Pulse input Pulse input Pulse input Pulse input
Group 12345
External input I0 I1 I2 I3 I4 I5
Two-phase
high-speed
counter
Pulse input
(A-phase)
Pulse input
(B-phase)
External clear
input
*1
(Z-phase)
–––
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