Omron DEVICENET#05-2003 - Page 183

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GT1-CT01 Counter Unit Section 5-4
Input Specifications (Encoder Input: A, B, Z, External Input: IN)
Item Specification
Encoder input (A, B, Z) External input (IN)
ON voltage 19.2 VDC min. (between each
input terminal and V)
15 VDC min. (between each
input terminal and V)
OFF voltage 4 VDC max. (between each input
terminal and V)
5 VDC max. (between each
input terminal and V)
OFF current 1.0 mA max. 1.0 mA max.
Input current 18 mA max./point at 24 VDC
(between each input terminal and
V)
6 mA max./point at 24 VDC
(between each input terminal
and V)
ON response
time
--- 1.0 ms max.
OFF response
time
--- 1.0 ms max.
Insulation
resistance
20 MΩ min. at 250 VDC (between isolated circuits)
Isolation
method
Photocoupler
Number of cir-
cuits
1 count input point 1 point
Minimum
response
pulse
Encoder Inputs A and B
Waveform
Input rising time/falling time:
3 ms max. at 50 kHz with pulses
with a duty factor of 50%
20 µs min.
10 µs min. 10 µs min.
Relationship between A and B
phases with offset phase input
Phase
A
Phase
B
Encoder Input Z
0.1 ms min.
5 µs
min.
5 µs
min.
5 µs
min.
5 µs
min.
0.1 ms min.
20 µs min.
1 ms min. 1 ms min.