Omron produce NX-series I/O System such as EtherNet/IP Unit, Communication Coupler, Digital Input Unit, Digital Output Unit, Analog Input/Output Unit, Temperature Control Unit, Temperature Input Unit, Heater Burnout Detection Unit, Load Cell Input Unit, Position Interface Unit, IO-Link Master Unit, Communication Interface Units, RFID Units, System Unit, Safety CPU Unit, Safety I/O Unit and EtherCAT Salve Unit.

Specification Omron Digital Output Unit

Product Name	Specification						Model
Product Name	Number of points	Internal I/O common	Maximum value of load current	Rated voltage	I/O refreshing method	ON/OFF response time	Model
Omron 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
	2 points	PNP	0.5 A/point, 1 A/Unit	24 VDC	Output refreshing with specified time stamp only *1	300 ns max./ 300 ns max.	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
		NPN		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
	8 points	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
	16 points	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
	32 points	PNP	0.5 A/point, 4 A/ terminal block, 8 A/Unit	24 VDC		0.5 ms max./ 1.0 ms max.	NX-OD6256
Omron 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
	16 points	PNP	0.5 A/point, 5 A/Unit	24 VDC		0.5 ms max./ 1.0 ms max.	NX-OD5256-1
Omron 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
	16 points	PNP	0.5 A/point, 2 A/Unit	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
	32 points	PNP	0.5 A/point, 2 A/common, 4 A/Unit	24 VDC		0.5 ms max./ 1.0 ms max.	NX-OD6256-5
Omron Transistor Output Unit (Fujitsu 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
Omron 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
	2 points	Relay type: N.O.+N.C.			Free-Run refreshing	15 ms max./ 15 ms max.	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

Model Name	NX-OD4256	NX-OD2154	NX-OD2258	NX-OD3121	NX-OD3153
I/O system	NX I/O Bus	NX I/O Bus	NX I/O Bus	NX I/O Bus	NX I/O Bus
Type of module	Digital I/O	Digital I/O	Digital I/O	Digital I/O	Digital I/O
Number of digital inputs	0	0	0	0	0
Digital input type	None	None	None	None	None
OFF/ON delay	0.5-1.0 ms	0-0.3 ms	0-0.3 ms	0.1-0.8 ms	0-0.3 ms
Number of digital outputs	8	2	2	4	4
Digital output type	PNP	NPN	PNP	NPN	NPN
Permitted voltage at output	15.0-28.8 V	15.0-28.8 V	15.0-28.8 V	10.2-28.8 V	15.0-28.8 V
Output current	0.5 A	0.5 A	0.5 A	0.5 A	0.5 A
Short-circuit protected outputs	✔	✘	✔	✘	✘
Connection method	2-wire	2-wire, 3-wire	2-wire, 3-wire	2-wire, 3-wire	2-wire, 3-wire
Signal processing	Free running, Standard speed, Synchronous	High speed, Timestamp	High speed, Timestamp	Free running, Standard speed, Synchronous	Free running, High speed, Synchronous
IO-Link master	✘	✘	✘	✘	✘
I/O connection type	Push-in	Push-in	Push-in	Push-in	Push-in
Number of I/O connectors	1	1	1	1	1
Detachable I/O connector	✔	✔	✔	✔	✔
Suitable for safety functions	✘	✘	✘	✘	✘
SIL according to IEC 61508	None	None	None	None	None
Communication port(s)	None	None	None	None	None
Number of IOV (V+) terminals	0	2	2	4	4
Number of IOG (V-) terminals	8	2	2	4	4
Number of COM terminals	0	0	0	0	0
Degree of protection (IP)	IP20	IP20	IP20	IP20	IP20
Product Height (unpacked)	104.5 mm	104.5 mm	104.5 mm	104.5 mm	104.5 mm
Product Width (unpacked)	12 mm	12 mm	12 mm	12 mm	12 mm
Product Depth (unpacked)	80.1 mm	80.1 mm	80.1 mm	80.1 mm	80.1 mm
Product Weight (unpacked)	70 g	65 g	65 g	70 g	70 g

Model Name	NX-OD3256	NX-OD3257	NX-OD3268	NX-OD4121	NX-OD5121
I/O system	NX I/O Bus	NX I/O Bus	NX I/O Bus	NX I/O Bus	NX I/O Bus
Type of module	Digital I/O	Digital I/O	Digital I/O	Digital I/O	Digital I/O
Number of digital inputs	0	0	0	0	0
Digital input type	None	None	None	None	None
OFF/ON delay	0.5-1.0 ms	0-0.3 ms	4	0.1-0.8 ms	0.1-0.8 ms
Number of digital outputs	4	4	PNP	8	16
Digital output type	PNP	PNP	15.0-28.8 V	NPN	NPN
Permitted voltage at output	15.0-28.8 V	15.0-28.8 V	2:00 AM	10.2-28.8 V	10.2-28.8 V
Output current	0.5 A	0.5 A		0.5 A	0.5 A
Short-circuit protected outputs	✔	✔	✔	✘	✘
Connection method	2-wire, 3-wire	2-wire, 3-wire	2-wire, 3-wire	2-wire	1-wire
Signal processing	Free running, Standard speed, Synchronous	Free running, High speed, Synchronous	Free running, Standard speed, Synchronous	Free running, Standard speed, Synchronous	Free running, Standard speed, Synchronous
IO-Link master	✘	✘	✘	✘	✘
I/O connection type	Push-in	Push-in	Push-in	Push-in	Push-in
Number of I/O connectors	1	1	1	1	1
Detachable I/O connector	✔	✔	✔	✔	✔
Suitable for safety functions	✘	✘	✘	✘	✘
SIL according to IEC 61508	None	None	None	None	None
Communication port(s)	None	None	None	None	None
Number of IOV (V+) terminals	4	4	6	8	0
Number of IOG (V-) terminals	4	4	6	0	0
Number of COM terminals	0	0	0	0	0
Degree of protection (IP)	IP20	IP20	IP20	IP20	IP20
Product Height (unpacked)	104.5 mm	104.5 mm	106 mm	104.5 mm	104.5 mm
Product Width (unpacked)	12 mm	12 mm	12 mm	12 mm	12 mm
Product Depth (unpacked)	80.1 mm	80.1 mm	80 mm	80.1 mm	80.1 mm
Product Weight (unpacked)	70 g	70 g	70 g	95 g	87 g

Model Name	NX-OD5121-1	NX-OD5121-5	NX-OD5256	NX-OD5256-1	NX-OD5256-5
I/O system	NX I/O Bus	NX I/O Bus	NX I/O Bus	NX I/O Bus	NX I/O Bus
Type of module	Digital I/O	Digital I/O	Digital I/O	Digital I/O	Digital I/O
Number of digital inputs	0	0	0	0	0
Digital input type	None	None	None	None	None
OFF/ON delay	0.1-0.8 ms	0.1-0.8 ms	0.5-1.0 ms	0.5-1.0 ms	0.5-1.0 ms
Number of digital outputs	16	16	16	16	16
Digital output type	NPN	NPN	PNP	PNP	PNP
Permitted voltage at output	10.2-28.8 V	10.2-28.8 V	15.0-28.8 V	20.4-28.8 V	20.4-28.8 V
Output current	0.5 A	0.5 A	0.5 A	0.5 A	0.5 A
Short-circuit protected outputs	✘	✘	✔	✔	✔
Connection method	1-wire	1-wire	1-wire	1-wire	1-wire
Signal processing	Free running, Standard speed, Synchronous	Free running, Standard speed, Synchronous	Free running, Standard speed, Synchronous	Free running, Standard speed, Synchronous	Free running, Standard speed, Synchronous
IO-Link master	✘	✘
I/O connection type	Screw	MIL (plug not included)	Push-in	Screw	MIL (plug not included)
Number of I/O connectors	1	1	1	1	1
Detachable I/O connector	✔	✔	✔	✔	✔
Suitable for safety functions	✘	✘	✘	✘	✘
SIL according to IEC 61508	None	None	None	None	None
Communication port(s)	None	None	None	None	None
Number of IOV (V+) terminals	1	2	0	1	2
Number of IOG (V-) terminals	1	2	0	1	2
Number of COM terminals	0	0	0	0	0
Degree of protection (IP)	IP20	IP20	IP20	IP20	IP20
Product Height (unpacked)	100 mm	100 mm	104.5 mm	100 mm	100 mm
Product Width (unpacked)	30 mm	30 mm	12 mm	30 mm	30 mm
Product Depth (unpacked)	95 mm	89.52 mm	80.1 mm	95 mm	89.52 mm
Product Weight (unpacked)	125 g	80 g	70 g	125 g	85 g

Model Name	NX-OD6121-5	NX-OD6121-6	NX-OC2633	NX-OC2733	NX-OC4633
I/O system	NX I/O Bus	NX I/O Bus	NX I/O Bus	NX I/O Bus	NX I/O Bus
Type of module	Digital I/O	Digital I/O	Digital I/O	Digital I/O	Digital I/O
Number of digital inputs	0	0	0	0	0
Digital input type	None	None	None	None	None
OFF/ON delay	0.1-0.8 ms	0.1-0.8 ms	0-15 ms	0-15 ms	15-15 ms
Number of digital outputs	32	32	2	2	8
Digital output type	NPN	NPN	Relay NO	Relay NO+NC	Relay NO
Permitted voltage at output	15.0-28.8 V	15.0-28.8 V	0-250 V	0-250 V	24-250 V
Output current	0.5 A	0.5 A	2:00 AM	2:00 AM	2:00 AM
Short-circuit protected outputs	✘	✘	✘	✘	✘
Connection method	1-wire	1-wire	2-wire	3-wire	2-wire
Signal processing	Free running, Standard speed, Synchronous	Free running, Standard speed, Synchronous	Free running, Standard speed	Free running, Standard speed	Free running, Standard speed
IO-Link master	✘	✘	✘	✘	✘
I/O connection type	MIL (plug not included)	FCN (plug not included)	Push-in	Push-in	Push-in
Number of I/O connectors	1	1	1	1	2
Detachable I/O connector	✔	✔	✔	✔	✔
Suitable for safety functions	✘	✘	✘	✘	✘
SIL according to IEC 61508	None	None	None	None	None
Communication port(s)	None	None	None	None	None
Number of IOV (V+) terminals	4	4	0	0	0
Number of IOG (V-) terminals	4	4	0	0	0
Number of COM terminals	0	0	0	0	0
Degree of protection (IP)	IP20	IP20	IP20	IP20	IP20
Product Height (unpacked)		100 mm	100 mm	100 mm
Product Width (unpacked)		30 mm	12 mm	12 mm
Product Depth (unpacked)		72.5 mm	80 mm	80 mm
Product Weight (unpacked)	135 g	90 g	65 g	70 g	167 g

Additional information

Weight	N/A
Dimensions	N/A
Model	NX-OD4256, NX-OC2633, NX-OC2733, NX-OC4633, NX-OD2154, NX-OD2258, NX-OD3121, NX-OD3153, NX-OD3256, NX-OD3257, NX-OD3268, NX-OD4121, NX-OD5121, NX-OD5121-1, NX-OD5121-5, NX-OD5256, NX-OD5256-1, NX-OD5256-5, NX-OD6121-5, NX-OD6121-6