Product name	Specification						Model
Product name	Number of channels	External inputs	Maximum response frequency	I/O refreshing method *	Number of I/O entry mappings	Remarks	Model
Incremental Encoder Input Unit	1 (NPN)	3 (NPN)	500 kHz	• Free-Run refreshing • Synchro- nous I/O refreshing • Task period prioritized refreshing	1/1	24-V voltage input	NX-EC0112
	1 (PNP)	3 (PNP)	500 kHz			24-V voltage input	NX-EC0122
	1	3 (NPN)	4 MHz			Line receiver input	NX-EC0132
	1	3 (PNP)	4 MHz			Line receiver input	NX-EC0142
	2 (NPN)	None	500 kHz		2/2	24-V voltage input	NX-EC0212
	2 (PNP)	None	500 kHz		2/2	24-V voltage input	NX-EC0222

* Refer to the I/O Refreshing Methods in the USER’S MANUAL (Cat. No. W524) for the communications cycles for each
model.

General Specification

Item		Specification
Enclosure		Mounted in a panel
Grounding method		Ground to less than 100 Ω
Operating environment	Ambient operating temperature	0 to 55°C
	Ambient operating humidity	10% to 95% (with no condensation or icing)
	Atmosphere	Must be free from corrosive gases.
	Ambient storage temperature	-25 to 70°C (with no condensation or icing)
	Altitude	2,000 m max.
	Pollution degree	Pollution degree 2 or less: Meets IEC 61010-2-201.
	Noise immunity	Conforms to IEC61000-4-4, 2 kV (power supply line)
	Overvoltage category	Category II: Meets IEC 61010-2-201.
	EMC immunity level	Zone B
	Vibration resistance	Conforms to IEC 60068-2-6. 5 to 8.4 Hz with 3.5-mm amplitude, 8.4 to 150 Hz, acceleration of 9.8 m/s², 100 min each in X, Y, and Z directions (10 sweeps of 10 min each = 100 min total)
	Shock resistance	Conforms to IEC 60068-2-27. 147 m/s², 3 times each in X, Y, and Z directions
Applicable standards *		cULus: Listed (UL508) or Listed (UL 61010-2-201), ANSI/ISA 12.12.01, EU: EN 61131-2, C-Tick or RCM, KC Registration, NK, LR

*Ask your OMRON representative for the most recent applicable standards for each model.

Incremental Encoder Input Unit Specifications

Incremental Encoder Input Unit

Counter functions
Unit name		Incremental Encoder Input Unit	Model	NX-EC0112
Number of channels		1 channel	Type of external connections	Screwless clamping terminal block (16 terminals)
I/O refreshing method		Free-Run refreshing, synchronous I/O refreshing or task period prioritized refreshing *
Indicators			Input signals	Counter: Phases A, B, and Z External Inputs: 3
Input form		Voltage input (24 V)
Counting unit		Pulses
Pulse input method		Phase differential pulse (multiplication x2/4), pulse + direction inputs, or up and down pulse inputs
Counter range		-2,147,483,648 to 2,147,483,647 pulses
	Counter type	Ring counter or linear counter
	Counter controls	Gate control, counter reset, and counter preset
	Latch function	Two external input latches and one internal latch
	Measurements	Two external input latches and one internal latch
Voltage input specifications
	Input voltage	20.4 to 28.8 VDC (24 VDC +20%/-15%)	ON voltage	19.6 VDC min./3 mA min.
	Input current	4.2 mA typical (24 VDC)	OFF voltage	4.0 VDC max./1 mA max.
	Maximum response frequency	Phases A and B: Single-phase 500 kHz (phase differential pulse input x4: 125 kHz), Phase Z: 125 kHz
	Internal I/O common processing	NPN
External input specifications
	Input voltage	20.4 to 28.8 VDC (24 VDC +20%, -15%)	ON voltage/ ON current	15 VDC min./3 mA min.
	Input current	4.6 mA typical (24 VDC)	OFF voltage/ OFF current	4.0 VDC max./1 mA max.
	ON/OFF response time	1 μs max./2 μs max.
	Internal I/O common processing	NPN
Dimensions		12 × 100 × 71 mm (W × H × D)	Isolation method	Photocoupler isolation
Insulation resistance		20 MΩ min. between isolated circuits (at 100 VDC)	Dielectric strength	510 VAC between isolated circuits for 1 minute with leakage current of 5 mA max.
I/O power supply method		Supplied from the NX bus. 20.4 to 28.8 VDC (24 VDC +20%, -15%)	Current capacity of I/O power supply terminals	IOV: 0.3 A max. per terminal for encoder supply section and 0.1 A max. per terminal for other sections IOG: 0.3 A max. per terminal for encoder supply section and 0.1 A max. per terminal for other sections
NX Unit power consumption		• Connected to a CPU Unit 1.15 W max. • Connected to a Commu- nications Coupler Unit 0.85 W max.	Current consumption from I/O power supply	None
Weight		70 g max.
Circuit layout
Installation orientation and restrictions		Installation orientation: • Connected to a CPU Unit: Possible in upright installation. • Connected to a Communications Coupler Unit: Possible in 6 orientations. Restrictions: There are no restrictions.
Terminal connection diagram
Failure detection		None	Protection	None

* The I/O refreshing method is automatically set according to the connected Communications Coupler Unit and CPU Unit.

Counter functions
Unit name		Incremental Encoder Input Unit	Model	NX-EC0122
Number of channels		1 channel	Type of external connections	Screwless push-in terminal block (16 terminals)
I/O refreshing method		Free-Run refreshing, synchronous I/O refreshing or task period prioritized refreshing *
Indicators			Input signals	Counter: Phases A, B, and Z External Inputs: 3
Input form		Voltage input (24 V)
Counting unit		Pulses
Pulse input method		Phase difference pulse (multiplication x2/4), pulse + direction inputs, or up and down pulse inputs
Counter range		-2,147,483,648 to 2,147,483,647 pulses
	Counter type	Ring counter or linear counter
	Counter controls	Gate control, counter reset, and counter preset
	Latch function	Two external input latches and one internal latch
	Measurements	Two external input latches and one internal latch
Voltage input specifications
	Input voltage	20.4 to 28.8 VDC (24 VDC +20%/-15%)	ON voltage	19.6 VDC min./3 mA min.
	Input current	4.2 mA typical (24 VDC)	OFF voltage	4.0 VDC max./1 mA max.
	Maximum response frequency	Phases A and B: Single-phase 500 kHz (phase difference pulse input x4: 125 kHz), Phase Z: 125 kHz
	Internal I/O common processing	PNP
External input specifications
	Input voltage	20.4 to 28.8 VDC (24 VDC +20%/-15%)	ON voltage/ ON current	15 VDC min./3 mA min.
	Input current	4.6 mA typical (24 VDC)	OFF voltage/ OFF current	4.0 VDC max./1 mA max.
	ON/OFF response time	1 μs max./2 μs max.
	Internal I/O common processing	PNP
Dimensions		12 × 100 × 71 mm (W × H × D)	Isolation method	Photocoupler isolation
Insulation resistance		20 MΩ min. between isolated circuits (at 100 VDC)	Dielectric strength	510 VAC between isolated circuits for 1 minute with leakage current of 5 mA max.
I/O power supply source		Supplied from the NX bus. 20.4 to 28.8 VDC (24 VDC +20%/-15%)	Current capacity of I/O power supply terminals	IOV: 0.3 A max. per terminal for encoder supply section and 0.1 A max. per terminal for other sections IOG: 0.3 A max. per terminal for encoder supply section and 0.1 A max. per terminal for other sections
NX Unit power consumption		• Connected to a CPU Unit 1.30 W max. • Connected to a Commu- nications Coupler Unit 0.95 W max.	Current consumption from I/O power supply	None
Weight		70 g max.
Circuit layout
Installation orientation and restrictions		Installation orientation: • Connected to a CPU Unit: Possible in upright installation. • Connected to a Communications Coupler Unit: Possible in 6 orientations. Restrictions: There are no restrictions.
Terminal connection diagram
Failure detection		None	Protection	None

* The I/O refreshing method is automatically set according to the connected Communications Coupler Unit and CPU Unit.

Counter functions
Unit name		Incremental Encoder Input Unit	Model	NX-EC0132
Number of channels		1 channel	Type of external connections	Screwless clamping terminal block (12 terminals × 2)
I/O refreshing method		Free-Run refreshing, synchronous I/O refreshing or task period prioritized refreshing *
Indicators			Input signals	Counter: Phases A, B, and Z External Inputs: 3
Input form		Line receiver input
Counting unit		Pulses
Pulse input method		Phase differential pulse (multiplication x2/4), pulse + direction inputs, or up and down pulse inputs
Counter range		-2,147,483,648 to 2,147,483,647 pulses
	Counter type	Ring counter or linear counter
	Counter controls	Gate control, counter reset, and counter preset
	Latch function	Two external input latches and one internal latch
	Measurements	Pulse rate measurement and pulse period measurement
Line driver specifications
	Input voltage	EIA standard RS-422-A line driver levels	High level input voltage	VIT+: 0.1 V min.
	Input impedance	120 Ω ± 5%	Low level input voltage	VIT-: -0.1 V min.
	Hysteresis voltage	Vhys (VIT+ – VIT-): 60 mV
	Maximum response frequency	Phases A and B: Single-phase 4 MHz (phase differential pulse input x4: 1 MHz), Phase Z: 1 MHz
	5-V power supply for encoder	Output voltage: 5 VDC ±5% Output current: 500 mA max.
External input specifications
	Input voltage	20.4 to 28.8 VDC (24 VDC +20%, -15%)	ON voltage/ ON current	15 VDC min./3 mA min.
	Input current	3.5 mA typical (24 VDC)	OFF voltage/ OFF current	5.0 VDC max./1 mA max.
	ON/OFF response time	1 μs max./1 μs max.
	Internal I/O common processing	NPN
Dimensions		12 × 100 × 71 mm (W × H × D)	Isolation method	Digital isolator
Insulation resistance		20 MΩ min. between isolated circuits (at 100 VDC)	Dielectric strength	510 VAC between isolated circuits for 1 minute with leakage current of 5 mA max.
I/O power supply method		Supplied from the NX bus. 20.4 to 28.8 VDC (24 VDC +20%, -15%)	Current capacity of I/O power supply terminals	IOV: 0.1 A max. per terminal IOG: 0.1 A max. per terminal
NX Unit power consumption		• Connected to a CPU Unit 1.25 W max. • Connected to a Commu- nications Coupler Unit 0.95 W max.	Current consumption from I/O power supply	Unit current consumption: 30 mA max. Consumption from encoder 5-V power supply: 0.28 × Encoder current consumption mA
Weight		130 g max.
Circuit layout
Installation orientation and restrictions		Installation orientation: • Connected to a CPU Unit: Possible in upright installation. • Connected to a Communications Coupler Unit: Possible in 6 orientations. Restrictions: There are no restrictions.
Terminal connection diagram
Failure detection		None	Protection	None

* The I/O refreshing method is automatically set according to the connected Communications Coupler Unit and CPU Unit.

Counter functions
Unit name		Incremental Encoder Input Unit	Model	NX-EC0142
Number of channels		1 channel	Type of external connections	Screwless push-in terminal block (12 terminals × 2)
I/O refreshing method		Free-Run refreshing, synchronous I/O refreshing or task period prioritized refreshing *
Indicators			Input signals	Counter: Phases A, B, and Z External Inputs: 3
Input form		Line receiver input
Counting unit		Pulses
Pulse input method		Phase difference pulse (multiplication x2/4), pulse + direction inputs, or up and down pulse inputs
Counter range		-2,147,483,648 to 2,147,483,647 pulses
	Counter type	Ring counter or linear counter
	Counter controls	Gate control, counter reset, and counter preset
	Latch function	Two external input latches and one internal latch
	Measurements	Pulse rate measurement and pulse period measurement
Line driver specifications
	Input voltage	EIA standard RS-422-A line driver levels	High level input voltage	VIT+: 0.1 V min.
	Input impedance	120 Ω ± 5%	Low level input voltage	VIT-: -0.1 V min.
	Hysteresis voltage	Vhys (VIT+ – VIT-): 60 Mv
	Maximum response frequency	Phases A and B: Single-phase 4 MHz (phase difference pulse input x4: 1 MHz), Phase Z: 1 MHz
	5-V power supply for encoder	Output voltage: 5 VDC Output current: 500 mA max.
External input specifications
	Input voltage	20.4 to 28.8 VDC (24 VDC +20%/.15%)	ON voltage/ ON current	15 VDC min./3 mA min.
	Input current	3.5 mA typical (24 VDC)	OFF voltage/ OFF current	4.0 VDC max./1 mA max.
	ON/OFF response time	1 μs max./2 μs max.
	Internal I/O common processing	PNP
Dimensions		12 × 100 × 71 mm (W × H × D)	Isolation method	Photocoupler isolation
Insulation resistance		20 MΩ min. between isolated circuits (at 100 VDC)	Dielectric strength	510 VAC between isolated circuits for 1 minute with leakage current of 5 mA max.
I/O power supply source		Supplied from the NX bus. 20.4 to 28.8 VDC (24 VDC +20%/-15%)	Current capacity of I/O power supply terminals	IOV: 0.1 A max. per terminal IOG: 0.1 A max. per terminal
NX Unit power consumption		• Connected to a CPU Unit 1.50 W max. • Connected to a Commu- nications Coupler Unit 1.05 W max.	Current consumption from I/O power supply	Unit current consumption: 30 mA max. Consumption from encoder 5-V power supply: 0.28 × Encoder current consumption mA
Weight		130 g max.
Circuit layout
Installation orientation and restrictions		Installation orientation: • Connected to a CPU Unit: Possible in upright installation. • Connected to a Communications Coupler Unit: Possible in 6 orientations. Restrictions: There are no restrictions.
Terminal connection diagram
Failure detection		None	Protection	None

* The I/O refreshing method is automatically set according to the connected Communications Coupler Unit and CPU Unit.

Counter functions
Unit name		Incremental Encoder Input Unit	Model	NX-EC0212
Number of channels		2 channels	Type of external connections	Screwless clamping terminal block (12 terminals)
I/O refreshing method		Free-Run refreshing, synchronous I/O refreshing or task period prioritized refreshing *
Indicators			Input signals	Counter: Phases A, B, and Z External Inputs: None
Input form		Voltage input (24 V)
Counting unit		Pulses
Pulse input method		Phase differential pulse (multiplication x2/4), pulse + direction inputs, or up and down pulse inputs
Counter range		-2,147,483,648 to 2,147,483,647 pulses
	Counter type	Ring counter or linear counter
	Counter controls	Gate control, counter reset, and counter preset
	Latch function	Two external input latches and one internal latch
	Measurements	Two external input latches and one internal latch
Voltage input specifications
	Input voltage	20.4 to 28.8 VDC (24 VDC +20%, -15%)	ON voltage	19.6 VDC min./3 mA min.
	Input current	4.2 mA typical (24 VDC)	OFF voltage	4.0 VDC max./1 mA max.
	Maximum response frequency	Phases A and B: Single-phase 500 kHz (phase differential pulse input x4: 125 kHz), Phase Z: 125 kHz
	Internal I/O common processing	NPN
External input specifications
	Input voltage	–	ON voltage/ ON current	–
	Input current	–	OFF voltage/ OFF current	–
	ON/OFF response time	–
	Internal I/O common processing	–
Dimensions		12 × 100 × 71 mm (W × H × D)	Isolation method	Photocoupler isolation
Insulation resistance		20 MΩ min. between isolated circuits (at 100 VDC)	Dielectric strength	510 VAC between isolated circuits for 1 minute with leakage current of 5 mA max.
I/O power supply method		Supplied from the NX bus. 20.4 to 28.8 VDC (24 VDC +20%, -15%)	Current capacity of I/O power supply terminals	IOV: 0.3 A max. per terminal IOG: 0.3 A max. per terminal
NX Unit power consumption		• Connected to a CPU Unit 1.15 W max. • Connected to a Commu- nications Coupler Unit 0.85 W max.	Current consumption from I/O power supply	None
Weight		70 g max.
Circuit layout
Installation orientation and restrictions		Installation orientation: • Connected to a CPU Unit: Possible in upright installation. • Connected to a Communications Coupler Unit: Possible in 6 orientations. Restrictions: There are no restrictions.
Terminal connection diagram
Failure detection		None	Protection	None

* The I/O refreshing method is automatically set according to the connected Communications Coupler Unit and CPU Unit.

Counter functions
Unit name		Incremental Encoder Input Unit	Model	NX-EC0222
Number of channels		2 channels	Type of external connections	Screwless push-in terminal block (12 terminals)
I/O refreshing method		Free-Run refreshing, synchronous I/O refreshing or task period prioritized refreshing *
Indicators			Input signals	Counter: Phases A, B, and Z External Inputs: None
Input form		Voltage input (24 V)
Counting unit		Pulses
Pulse input method		Phase difference pulse (multiplication x2/4), pulse + direction inputs, or up and down pulse 3inputs
Counter range		-2,147,483,648 to 2,147,483,647 pulses
	Counter type	Ring counter or linear counter
	Counter controls	Gate control, counter reset, and counter preset
	Latch function	Two external input latches and one internal latch
	Measurements	Two external input latches and one internal latch
Voltage input specifications
	Input voltage	20.4 to 28.8 VDC (24 VDC +20%/-15%)	ON voltage	19.6 VDC min./3 mA min.
	Input current	4.2 mA typical (24 VDC)	OFF voltage	4.0 VDC max./1 mA max.
	Maximum response frequency	Phases A and B: Single-phase 500 kHz (phase difference pulse input x4: 125 kHz), Phase Z: 125 kHz
	Internal I/O common processing	PNP
External input specifications
	Input voltage	–	ON voltage/ ON current	–
	Input current	–	OFF voltage/ OFF current	–
	ON/OFF response time	–
	Internal I/O common processing	–
Dimensions		12 × 100 × 71 mm (W × H × D)	Isolation method	Photocoupler isolation
Insulation resistance		20 MΩ min. between isolated circuits (at 100 VDC)	Dielectric strength	510 VAC between isolated circuits for 1 minute with leakage current of 5 mA max.
I/O power supply source		Supplied from the NX bus. 20.4 to 28.8 VDC (24 VDC +20%/-15%)	Current capacity of I/O power supply terminals	IOV: 0.3 A max. per terminal IOG: 0.3 A max. per terminal
NX Unit power consumption		• Connected to a CPU Unit 1.30 W max. • Connected to a Commu- nications Coupler Unit 0.95 W max.	Current consumption from I/O power supply	None
Weight		70 g max.
Circuit layout
Installation orientation and restrictions		Installation orientation: • Connected to a CPU Unit: Possible in upright installation. • Connected to a Communications Coupler Unit: Possible in 6 orientations. Restrictions: There are no restrictions.
Terminal connection diagram
Failure detection		None	Protection	None