Omron GX-ID1611 User Manual page 216

9 Encoder Input Slave Unit
When phase A/B phase difference pulse is input, the connection with external input devices
becomes as follows.
 Code + pulse input
Input A is count pulse signal and input B is count direction control signal.
The count is incremented at rise of phase A when input B is ON and decremented at rise of phase A
when input B is OFF.
Count pulse signal
Input A
Count direction
control signal
Input B
Counter value
When code and pulses are input, the connection with external input devices becomes as follows.
Encoder or other
pulse generators
 Incremental/decremental pulse input
The count is incremented at rise of input A pulse and decremented at rise of input B pulse.
Input A
Input B
Counter value
9 - 10
Encoder
(Reset Input)
Incremental count
0 1 2 3 4
Count pulse
Sensor or
switch
Count direction
control
Incremental count
0 1 2 3 4 5
Encoder Input Slave Unit
Input A
A
Input B
B
Input Z
Z
5 6 8 7
7
Encoder Input Slave Unit
Input A
Input B
Input Z
Decremental count
6 8 7 6
7
GX-series EtherCAT Slave Unit User's Manual
Decremental count
6 5 4 3 2
1
5 4 3 2 0
1
0