A - 35
Appendices
NX-series Digital I/O Unit User’s Manual (W521)
A-1  Data Sheet
A
A-1-2  Digital Input Units
Terminal connection 
diagram
Disconnec-
tion/Short-circuit 
detection
Not supported. Protective function Not supported.
A1
A3
A5
A2
A4
A6
A8
A9
A10
A7
IN0
IN2
IN4
IN1
IN3
IN5
IN7
COM0
IN8
IN6
A11
A13
A15
A12
A14
A16
A18
A19
A20
A17
B1
B3
B5
B2
B4
B6
B8
B9
B10
B7
B11
B13
B15
B12
B14
B16
B18
B19
B20
B17
Connector
pin
Signal name
Signal name
24 V
DC
IN16
IN18
IN20
IN17
IN19
IN21
IN23
COM1
IN24
IN22
24 V
DC
IN9
IN11
IN13
IN10
IN12
IN14
COM0
NC
NC
IN15
IN25
IN27
IN29
IN26
IN28
IN30
COM1
NC
NC
IN31
• The polarity of the input power supply can be connected in either direction.
• Be sure to wire both pins A9 and A18 (COM0), and set the same polarity for both pins.
• Be sure to wire both pins B9 and B18 (COM1), and set the same polarity for both pins.