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9   Encoder Input Slave Unit
GX-series EtherCAT Slave Unit User’s Manual
9-4  Specifications for Each Slave Unit
9
9-4-2  Line Driver Input Type GX-EC0241
Precautions for Correct Use
• Use shielded cable and ground the shield to 100 Ω or less when wiring pulse input A/B/Z with 
external control inputs.
• Wiring of pulse input A/B/Z shall be as short as possible and separated from wiring with many 
noises such as power lines.
• Use stabilizing power supply separate from other inputs/outputs for Encoder Input Slave Units 
as much as possible.
• Do not wire anything to RSV terminals.
Wiring diagram
RSV
RSV RSV RSV RSV
RSV LA1 LB1
RST1
V1 V1
A
+
B
+
Z
+
V1 V1 V1
G1 G1
A
−
B
−
Z
−
G1 G1 G1
V1
G1
RSV
RSV RSV RSV RSV
RSV LA2 LB2
RST2
V1 V1
A
+
B
+
Z
+
V1 V1 V1
G1 G1
A
−
B
−
Z
−
G1 G1 G1
V1
G1
Encoder
(Line driver
output type)
Encoder power supply
(5 VDC)
Blue
: 
0V
Brown
: 
Vcc
Black
: 
Phase A+  Black/Red
: 
Phase A−  
Internal circuit / 
sensor power supply
(24 VDC)
Encoder
(Line driver
output type)
White
: 
Phase B+  White/Red
: 
Phase B−  
Orange
: 
Phase Z+  Orange/Red
: 
Phase Z−  
Encoder power supply
(5 VDC)
Phase
A
Phase
B
Phase
Z
Black
Blue
Latch
Black
Blue
Reset
Black
Blue
Latch
Output 
2-wire sensor
NPN output 
3-wire sensor
Black
Brown
Blue
Latch
Black
Brown
Blue
Latch
Black
Brown
Blue
Reset