Datasheet

NX series I/O 15
Digital output unit (with time stamp function)
Item Specifications
Model NX-OD2154 NX-OD2258
Name Transistor output unit
Internal I/O common NPN PNP
Capacity 2 points 2 points
Rated voltage 24 VDC
Operating load voltage 15 to 28.8 VDC
Maximum value of load
current
0.5 A/point, 1 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 300 ns 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 Digital isolator
Unit power consumption 0.50 W max.
I/O power supply method Supply from the NX bus
I/O current consumption 30 mA max. 40 mA max.
Current capacity of I/O
power supply terminal
0.5 A/terminal max.
I/O refreshing method Time Stamp
Terminal block type Screwless push-in terminal
8 terminals (A + B)
Dimensions (W x H x D) 12 × 100 × 71 mm
Weight 70 g max.
Disconnection/
short-circuit detection
Not supported
Protective function Not supported With load short-circuit protection
Terminal wiring
Circuit layout
NX-OD2154
NX-OD2154
OUT0 to OUT1
This unit uses a push-pull output circuit.
IOV0 to 1
IOG0 to 1
Terminal block
Internal circuits
Isolation circuit
Drive circuit
I/O power supply +
I/O power supply 
I/O power supply +
I/O power supply 
Two-wire type
Three-wire type
24 VDC
IOV
IOG
IOV
IOG
IOV
IOG
IOV
IOG
A1 B1
A8 B8
A1 B1
A8 B8
OUT1
IOV
IOG
NC
OUT0
IOV
IOG
NC
NX-OD2258
NX-OD2258
OUT0 to OUT1
This unit uses a push-pull output circuit.
IOV0 to 1
IOG0 to 1
Terminal block
Internal circuits
Isolation circuit
Drive circuit
I/O power supply +
I/O power supply 
I/O power supply +
I/O power supply 
Two-wire type
Three-wire type
24 VDC
IOV
IOG
IOV
IOG
IOV
IOG
IOV
IOG
A1 B1
A8 B8
A1 B1
A8 B8
OUT1
IOV
IOG
NC
OUT0
IOV
IOG
NC
NX bus
connector
(left)
NX bus
connector
(right)
NX bus
connector
(left)
NX bus
connector
(right)
Additional I/O
power supply unit
Transistor output
unit
NX-OD2154
Additional I/O
power supply unit
Transistor output
unit
NX-OD2258