40
Specifications Section 2-1
High-speed Counter Inputs
The following CPU Unit input bits can be used as high-speed counter inputs.
The maximum count frequency is 5 kHz in differential phase mode and
20 kHz in the other modes.
The minimum pulse widths for inputs IN00000 (A-phase input) and IN00001
(B-phase input) are as follows:
The minimum pulse width for input IN00002 (Z-phase input) is as follows:
Interrupt Inputs
CPM2C PCs are equipped with inputs that can be used as interrupt inputs
(interrupt input mode or counter mode) and quick-response inputs. The mini-
mum pulse width for these inputs is 50
µs.
In CPU Units with 10 I/O points, inputs IN00003 and IN00004 can be used as
interrupt inputs. In CPU Units with 20/32 I/O points, inputs IN00003 through
IN00006 can be used as interrupt inputs.
Input Function
Differential phase mode Pulse plus direction
input mode
Up/down input mode Increment mode
IN00000 A-phase pulse input Pulse input Increment pulse input Increment pulse input
IN00001 B-phase pulse input Direction input Decrement pulse input Normal input
IN00002 Z-phase pulse input or hardware reset input
(IN00002 can be used as a normal input when it is not used as a high-speed counter input.)
100 µ s min.
T
1 T2 T3 T4 : 12.5 µ s min.
Phase A
Phase B
50 µ s min.
12.5 µ s
min.
Pulse plus direction input mode, Up/down input
mode, Increment mode
Differential phase mode
12.5 µ s
min.
T1
T
2 T3 T4
50 µs min.
500 µs min.
Phase Z
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