Omron GX-AD0471, User Manual, Page: 230 / 394

9 Encoder Input Slave Unit
9 - 24 GX-series EtherCAT Slave Unit User’s Manual
 Pulse input timing specifications
Precautions for Correct Use
In order to satisfy the counter input specifications, it is necessary to pay attention to the type of
output driver of the encoder to be used, the length of encoder cable, and frequency of count
pulse.
Timing condition
A B C D E F G
<25 ns >125 ns >250 ns >0.5
μ
s >1
μ
s >0.25
μ
s >0.5
μ
s
C
B
F F
F
F
A A
ON
OFF
ON
OFF
A/B (
+
)
A/B (
−
)
G
A A
ON
OFF
ON
OFF
Z (
+
)
Z (
−
)
E
D
A A
ON
OFF
ON
OFF
A (
+
)
A (
−
)
Phase A
E
D
A
A
ON
OFF
ON
OFF
B(
+
)
B (
−
)
Phase B
ON
voltage
Terminal
input
Counter input phase A/B
Input pulse duty: 50% Counter input phase Z
Relationship between phase A and phase B at phase difference pulse input
OFF
voltage
Terminal
input
ON
voltage
OFF
voltage
Terminal
input
ON
voltage
ON
voltage
OFF
voltage
OFF
voltage