Omron, NX-EC Series

• Open collector output type and line driver output type incremental encoders can be connected

• High-speed remote I/O control with communications cycle as fast as 125 μs*1

• Free-run refreshing, synchronous I/O refreshing, or task period prioritized refreshing*2 with the NX1P2 CPU unit or EtherCAT coupler unit

• The MC Function Modules of the NJ/NX/NY5 Controllers allows the encoder to be used as a motion axis

• Latching (1 internal signal and 2 input signals from external devices)

• Pulse period measurement

• 32 bit counters (80000000 to 7FFFFFFF HEX)

• Maximum counting rate: 4 MHz (Line receiver: 4 MHz, open collector: 500 kHz)

• Time Stamping

• Maximum and minimum counter value setting

• Connect to the CJ PLC using the EtherNet/IP^TM bus coupler

*1. When using the NX-EC01[][] together with the NX701-[][][][] and NX-ECC203.
*2. Task period prioritized refreshing is available when the NX-ECC203 is used together.

Sysmac is a trademark or registered trademark of OMRON corporation in japan and other countries for OMRON factory automation products.
EtherCAT® is a registered trademark and patented technology, licensed by Beckhoff automation GmbH, germany. EtherNet/IP™ is a trademark of ODVA.
other company names and product names in this document are the trademarks or registered trademarks of their respective companies.

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: Conforms to JIS B3502 and IEC 61131-2.
	Noise immunity	Conforms to IEC61000-4-4, 2 kV (power supply line)
	Overvoltage category	Category II: Conforms to JIS B3502 and IEC 61131-2.
	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

NX-EC0112

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.

NX-EC0122

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.

NX-EC0132

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: Encoder current consumption *0.28 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.

NX-EC0142

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: Encoder current consumption *0.28 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.

NX-EC0212

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.

NX-EC0222

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

* The I/O refreshing method is automatically set according to the connected communications coupler unit and CPU unit.

Version Information

Connected to a CPU unit

Refer to the user’s manuals for the CPU unit for details on the CPU units to which NX units can be connected.

NX unit		Corresponding versions *
Model	unit version	CPU unit	Sysmac Studio
NX-EC0112	Ver.1.1 or later	Ver.1.13 or later	Ver.1.17 or higher
NX-EC0112	Ver.1.2 or later
NX-EC0122	Ver.1.0 or later
	Ver.1.1 or later
	Ver.1.2 or later
NX-EC0132	Ver.1.1 or later
NX-EC0132	Ver.1.2 or later
NX-EC0142	Ver.1.0 or later
	Ver.1.1 or later
	Ver.1.2 or later
NX-EC0212	Ver.1.1 or later
NX-EC0212	Ver.1.2 or later
NX-EC0222	Ver.1.0 or later
	Ver.1.1 or later
	Ver.1.2 or later

* Some units do not have all of the versions given in the above table. If a unit does not have the specified version,
support is provided by the oldest available version after the specified version. Refer to the user's manuals for the
specific units for the relation between models and versions.

Connected to a communications coupler unit

NX unit		*Corresponding versions 1**
Model	unit version	EtherCAT			EtherNet/IP
Model	unit version	Communications coupler unit	NJ/NX-series CPU unit or NY-series Industrial PC	Sysmac Studio	Commu- nications coupler unit	Sysmac Studio
NX-EC0112	Ver.1.1	Ver.1.1 or later *2	Ver.1.06 or later *2	Ver.1.10 or higher	Ver.1.0 or later	Ver.1.10 or higher
NX-EC0112	Ver.1.2	Ver.1.3 or later 3 4		Ver.1.13 or higher		Ver.1.13 or higher
NX-EC0122	Ver.1.0	Ver.1.1 or later *2		Ver.1.07 or higher		Ver.1.10 or higher
	Ver.1.1	Ver.1.1 or later *2		Ver.1.08 or higher		Ver.1.10 or higher
	Ver.1.2	Ver.1.3 or later 3 4		Ver.1.13 or higher		Ver.1.13 or higher
NX-EC0132	Ver.1.1	Ver.1.1 or later *2		Ver.1.10 or higher		Ver.1.10 or higher
NX-EC0132	Ver.1.2	Ver.1.3 or later 3 4		Ver.1.13 or higher		Ver.1.13 or higher
NX-EC0142	Ver.1.0	Ver.1.1 or later *2		Ver.1.07 or higher		Ver.1.10 or higher
	Ver.1.1	Ver.1.1 or later *2		Ver.1.08 or higher		Ver.1.10 or higher
	Ver.1.2	Ver.1.3 or later 3 4		Ver.1.13 or higher		Ver.1.13 or higher
NX-EC0212	Ver.1.1	Ver.1.1 or later *2		Ver.1.10 or higher		Ver.1.10 or higher
NX-EC0212	Ver.1.2	Ver.1.3 or later 3 4		Ver.1.13 or higher		Ver.1.13 or higher
NX-EC0222	Ver.1.0	Ver.1.1 or later *2		Ver.1.07 or higher		Ver.1.10 or higher
	Ver.1.1	Ver.1.1 or later *2		Ver.1.08 or higher		Ver.1.10 or higher
	Ver.1.2	Ver.1.3 or later 3 4		Ver.1.13 or higher		Ver.1.13 or higher

*1. Some units do not have all of the versions given in the above table. If a unit does not have the specified version, support is provided by the oldest available version after the specified version. Refer to the user's manuals for the specific units for the relation between models and versions.
*2. You can use the following versions if time stamp refreshing is not used.
EtherCAT coupler unit: Version 1.0 NJ-series CPU unit: Version 1.05 *3. To use task period prioritized refreshing, you must use the NX-ECC203.
*4. If you do not use task period prioritized refreshing, you can use EtherCAT coupler units which support Position Interface units with unit version 1.1 or earlier.

(Unit: mm)

Screwless Clamping Terminal Block Type

12 mm Width

24 mm Width

TITLE	DOCUMENT TYPE	SIZE
NX-EC0/ECS/PG0	Catalog	6840 KB

Incremental Encoder Input unit Specifications

Incremental Encoder Input unit

NX-EC0112

NX-EC0122

NX-EC0132

NX-EC0142

NX-EC0212

NX-EC0222

Version Information

Connected to a CPU unit

Connected to a communications coupler unit

Screwless Clamping Terminal Block Type

12 mm Width

24 mm Width

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