Datasheet
18 Remote I/O
Digital output unit (with M3 screw terminal block)
Item Specifications
Model NX-OD5121-1 NX-OD5256-1
Name Transistor output unit
Internal I/O common NPN PNP
Capacity 16 points 16 points
Rated voltage 12 to 24 VDC 24 VDC
Operating load voltage 10.2 to 28.8 VDC 20.4 to 28.8 VDC
Maximum value of load
current
0.5 A/point, 5 A/NX unit
Maximum inrush current 4.0 A/point, 10 ms max.
Leakage current 0.1 mA max.
Residual voltage 1.5 V max.
ON/OFF response time 0.1 ms max./0.8 ms max. 0.5 ms max./1.0 ms max.
Dielectric strength 510 VAC between isolated circuits for 1 minute at a leakage current of 5 mA max.
Insulation resistance 20 M min. between isolated circuits (at 100 VDC)
Isolation method Photocoupler isolation
Unit power consumption 0.60 W max. 0.65 W max.
I/O power supply method Supply from external source
I/O current consumption 30 mA max.
Current capacity of I/O
power supply terminal
Without I/O power supply terminals
I/O refreshing method Switching synchronous I/O refreshing and free-run refreshing
Terminal block type M3 screw terminal block
18 terminals
Dimensions (W x H x D) 30 × 100 × 71 mm
Weight 125 g max.
Disconnection/
short-circuit detection
Not supported
Protective function Not supported With load short-circuit protection
Terminal wiring
Circuit layout
NX-OD5121-1
OUT0 to OUT15
COM
+V
Terminal block
Internal circuits
NX-OD5121-1
A0
AB
A2
A4
A1
A3
A5
A7
A8
A6
B0
B2
B4
B1
B3
B5
B7
B8
B6
OUT2
OUT6
OUT0
OUT4
OUT8
OUT12
OUT14
COM
OUT10
Terminal
Signal nameSignal name
12 to 24 VDC
OUT3
OUT7
OUT1
OUT5
OUT9
OUT13
OUT15
+V
OUT11
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
NX-OD5256-1
OUT0 to OUT15
0V
COM (+V)
Terminal block
Internal circuits
NX-OD5256-1
A0
AB
A2
A4
A1
A3
A5
A7
A8
A6
B0
B2
B4
B1
B3
B5
B7
B8
B6
OUT2
OUT6
OUT0
OUT4
OUT8
OUT12
OUT14
0V
OUT10
Terminal
Signal nameSignal name
24 VDC
OUT3
OUT7
OUT1
OUT5
OUT9
OUT13
OUT15
COM (+V)
OUT11
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
NX bus
connector
(left)
NX bus
connector
(right)
I/O power
supply +
I/O power
supply –
I/O power
supply +
I/O power
supply –
NX bus
connector
(left)
NX bus
connector
(right)
I/O power
supply +
I/O power
supply –
I/O power
supply +
I/O power
supply –
Short-circuit
protection