OMRON NX-ID3317 NX-ID3343 NX-ID3344 NX-ID3417 NX-ID3443 NX-ID3444 NX-ID4342 NX-ID4442 NX-ID5342 NX-ID5442 NX-ID6342 NX-ID6442 NX-ID5142-1 NX-ID5142-5 NX-ID6142-5 NX-ID6142-6 NX-IA3117 NX-OD2154 NX-

Number 
of points

Internal 
I/O 
common

Rated 
input 
voltage

I/O refreshing method

ON/OFF 
response 
time

DC Input Unit 
 
(Screwless 
Clamping Terminal 
Block, 12 mm Width/ 
24 mm Width)

4 points

NPN

12 to 
24 VDC

Switching Synchronous I/O 
refreshing and Free-Run 
refreshing

20 μs max./ 
400 μs max.

NX-ID3317

24 VDC

100 ns max./ 
100 ns max.

NX-ID3343

Input refreshing with input 
changed time only *1

NX-ID3344

PNP

12 to 
24 VDC

Switching Synchronous I/O 
refreshing and Free-Run 
refreshing

20 μs max./ 
400 μs max.

NX-ID3417

24 VDC

Input refreshing with input 
changed time only *1

100 ns max./ 
100 ns max.

NX-ID3443

NX-ID3444

8 points

NPN

Switching Synchronous I/O 
refreshing and Free-Run 
refreshing

20 μs max./ 
400 μs max.

NX-ID4342

PNP

NX-ID4442

16 points

NPN

NX-ID5342

PNP

NX-ID5442

32 points

NPN

NX-ID6342

PNP

NX-ID6442

DC Input Unit 
 
(M3 Screw Terminal 
Block, 30 mm Width)

16 points

For both 
NPN/PNP

24 VDC

Switching Synchronous I/O 
refreshing and Free-Run 
refreshing

20 μs max./ 
400 μs max.

NX-ID5142-1

DC Input Unit 
 
(MIL Connector, 
30 mm Width)

16 points

For both 
NPN/PNP

24 VDC

Switching Synchronous I/O 
refreshing and Free-Run 
refreshing

20 μs max./ 
400 μs max.

NX-ID5142-5

32 points

NX-ID6142-5

DC Input Unit 
 
(Fujitsu/OTAX 
Connector, 
30 mm Width)

32 points

For both 
NPN/PNP

24 VDC

Switching Synchronous I/O 
refreshing and Free-Run 
refreshing

20 μs max./ 
400 μs max.

NX-ID6142-6

AC Input Unit 
 
(Screwless Clamping 
Terminal Block, 
12 mm Width)

4 points

200 to 240 VAC, 
50/60 Hz 
(170 to 264 VAC, 
±3 Hz)

Free-Run refreshing

10 ms max./ 
40 ms max.

NX-IA3117

Number 
of 
points

Internal 
I/O 
common

Maximum 
value of load 
current

Rated 
voltage

I/O 
refreshing 
method

ON/OFF 
response 
time

Transistor 
Output Unit 
 
(Screwless 
Clamping Terminal 
Block, 12 mm Width/
24 mm Width)

2 points

NPN

0.5 A/point, 
1 A/Unit

24 VDC

Output 
refreshing with
specified time 
stamp only *1

300 ns max./
300 ns max.

NX-OD2154

PNP

NX-OD2258

4 points

NPN

0.5 A/point, 
2 A/Unit

12 to 
24 VDC

Switching 
Synchronous 
I/O refreshing 
and Free-Run 
refreshing

0.1 ms max./
0.8 ms max.

NX-OD3121

24 VDC

300 ns max./
300 ns max.

NX-OD3153

PNP

0.5 ms max./
1.0 ms max.

NX-OD3256

300 ns max./
300 ns max.

NX-OD3257

2 A/point, 
8 A/Unit

0.5 ms max./
1.0 ms max.

NX-OD3268

8 points

NPN

0.5 A/point, 
4 A/Unit

12 to 
24 VDC

0.1 ms max./
0.8 ms max.

NX-OD4121

PNP

24 VDC

0.5 ms max./
1.0 ms max.

NX-OD4256

16 points

NPN

12 to 
24 VDC

0.1 ms max./
0.8 ms max.

NX-OD5121

PNP

24 VDC

0.5 ms max./
1.0 ms max.

NX-OD5256

32 points

NPN

0.5 A/point, 4 A/
terminal block, 
8 A/Unit

12 to 24 VDC

0.1 ms max./
0.8 ms max.

NX-OD6121

PNP

24 VDC

0.5 ms max./
1.0 ms max.

NX-OD6256

Transistor 
Output Unit 
 
(M3 Screw 
Terminal Block, 
30 mm Width)

16 points

NPN

0.5 A/point, 
5 A/Unit

12 to 
24 VDC

Switching 
Synchronous 
I/O refreshing 
and Free-Run 
refreshing

0.1 ms max./
0.8 ms max.

NX-OD5121-1

PNP

24 VDC

0.5 ms max./
1.0 ms max.

NX-OD5256-1

Transistor 
Output Unit 
 
(MIL Connector, 
30 mm Width)

16 points

NPN

0.5 A/point, 
2 A/Unit

12 to 
24 VDC

Switching 
Synchronous 
I/O refreshing 
and Free-Run 
refreshing

0.1 ms max./
0.8 ms max.

NX-OD5121-5

PNP

24 VDC

0.5 ms max./
1.0 ms max.

NX-OD5256-5

32 points

NPN

0.5 A/point, 
2 A/common, 
4 A/Unit

12 to 
24 VDC

0.1 ms max./
0.8 ms max.

NX-OD6121-5

PNP

24 VDC

0.5 ms max./
1.0 ms max.

NX-OD6256-5

Transistor 
Output Unit 
 
(Fujitsu/OTAX 
Connector, 
30 mm Width)

32 points

NPN

0.5 A/point, 
2 A/common, 
4 A/Unit

12 to 
24 VDC

Switching 
Synchronous 
I/O refreshing 
and Free-Run 
refreshing

0.1 ms max./
0.8 ms max.

NX-OD6121-6

Relay Output 
Unit 
 
(Screwless 
Clamping 
Terminal Block, 
12 mm Width/ 
24 mm Width)

2 points

Relay type:
N.O.

250 VAC/2 A (cosφ=1), 
250 VAC/2 A (cosφ=0.4), 
24 VDC/2 A, 4 A/Unit

Free-Run 
refreshing

15 ms max./ 
15 ms max.

NX-OC2633

Relay type:
N.O.+N.C.

NX-OC2733

8 points

Relay type:
N.O.

250 VAC/2 A (cosφ=1), 
250 VAC/2 A (cosφ=0.4), 
24 VDC/2 A, 8 A/Unit

Free-Run 
refreshing

15ms max./ 
15ms max.

NX-OC4633

Number 
of 
points

Internal I/O 
common

Maximum 
value of load 
current

I/O 
refreshing 
method

ON/OFF 
response 
time

DC Input/ 
Transistor 
Output Unit 
 
(MIL Connector,
30 mm Width)

Outputs: 
16 points
Inputs: 
16 points

Outputs: NPN 
Inputs: For both
NPN/PNP

Outputs: 
12 to 24 VDC 
Inputs: 24 VDCV

Switching 
Synchronous 
I/O refreshing
and Free-Run
refreshing

Outputs: 0.1 ms max./
0.8 ms max. 
Inputs: 20 μs max./ 
400 μs max.

NX-MD6121-5

Outputs: PNP 
Inputs: For both
NPN/PNP

Outputs: 
24 VDC 
Inputs: 24 VDC

Outputs: 0.5 ms max./
1.0 ms max. 
Inputs: 20 μs max./ 
400 μs max.

NX-MD6256-5

Transistor 
Output Unit 
 
(Fujitsu/OTAX 
Connector, 
30 mm Width)

Outputs: 
16 
points 
Inputs: 
16 
points

Outputs: NPN 
Inputs: For both
NPN/PNP

Outputs: 
12 to 24 VDC 
Inputs: 24 VDC

Switching 
Synchronous 
I/O refreshing
and Free-Run
refreshing

Outputs: 0.1 ms max./
0.8 ms max. 
Inputs: 20 μs max./ 
400 μs max.

NX-MD6121-6