NX-series EtherCAT Coupler Unit
Combine flexibility in Remote I/O configuration
with the speed and determinism of EtherCAT.
• The EtherCAT Coupler Unit is the link between the EtherCAT Machine
Control network and the NX-series I/O Units. With I/O Units ranging from
basic I/O's to high-speed synchronous models, the NX-series is the perfect
match for the Sysmac Machine Automation Controllers.
• Up to 63 NX-IO Units can be connected to one EtherCAT Coupler Unit. Standard and high-performance units can be mixed.*1
• High-speed remote I/O control is possible at the fastest communication cycle of 125 us.*2
• Each Coupler plus its I/O form just a single EtherCAT node on the network.
• I/O control and safety control can be integrated by connecting Units for safety.
• The Coupler supports the EtherCAT Distributed Clock (DC) and propagates this to synchronous I/O units.
• The node address can be fixed by rotary switches, or set by software. Choose the method that best suits your way of engineering.
• Slave configuration by Sysmac Studio can be done centrally via the controller, or on-the-spot using the Coupler's built-in USB port.
*1 Input per Coupler Unit: Maximum 1024 bytes, Output per Coupler Unit: Maximum 1024 bytes
*2 NX7-@@@@ and NX-ECC203 combined
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 of Beckhoff Automation GmbH for their patented technology. EtherNet/IPTM is the trademarks of ODVA.
Other company names and product names in this document are the trademarks or registered trademarks of their respective companies.
System Configuration of Slave Terminals
The following figure shows an example of the system configuration when an EtherCAT Coupler Unit is used as a Communications Coupler Unit.
Support Software EtherCAT master *2
NJ/NX-series CPU Unit, NY-series Industrial PC, or
Connection to peripheral USB port master from another manufacturer
or built-in EtherNet/IPTM port on
CPU Unit or Industrial PC *1
ESI files Built-in EtherCAT port
Sysmac Studio ●EtherCAT Slave Terminal
Support Software Communications cable NX Series
Ethernet cables EtherCAT Coupler Unit
Peripheral USB port. NX-ECC@@@
Connection to peripheral USB
port on EtherCAT Coupler Unit
ESI files NX Units End Cover
*1. The connection method for the Sysmac Studio depends on the model of the CPU Unit or Industrial PC.
*2. An EtherCAT Slave Terminal cannot be connected to any of the OMRON CJ1W-NC@81/@82 Position Control Units even though they can
operate as EtherCAT masters.
Note: For whether NX Units can be connected to the CPU Unit or Communications Coupler Unit to be used, refer to the user's manual for the CPU
Unit or Communications Coupler Unit to be used.
• The standards are abbreviated as follows: U: UL, U1: UL(Class I Division 2 Products for Hazardous Locations), C: CSA, UC: cULus, UC1: cULus (Class I Division
2 Products for Hazardous Locations), CU: cUL, N: NK, L: Lloyd, CE: EU Directives, RCM: Regulatory Compliance Mark, and KC: KC Registration.
• Contact your OMRON representative for further details and applicable conditions for these standards.
Communications cycle Current Maximum I/O
Unit type Product name in DC Mode *1 *2 consumption power supply Model Standards
EtherCAT Coupler Unit 4A NX-ECC201
NX-series 250 to 4,000 μs 1.45 W or lower UC1, N, L,
Communications NX-ECC202 CE, RCM, KC
Unit 10 A
125 to 10,000 μs 1.25 W or lower NX-ECC203 UC1, N, CE,
*1. This depends on the specifications of the EtherCAT master. For example, the values are as follows when the EtherCAT Coupler Unit is
connected to the built-in EtherCAT port on an NJ5-series CPU Unit: 500 μs, 1,000 μs, 2,000 μs, and 4,000 μs. Refer to the NJ/NX-series CPU
Unit Built-in EtherCAT Port User’s Manual (Cat. No. W505) for the specifications of the built-in EtherCAT ports on NJ/NX-series CPU Units.
*2. This depends on the Unit configuration.
Recommended EtherCAT Communications Cable
Use a straight STP (shielded twisted-pair) cable of category 5 or higher with double shielding (braiding and aluminum foil tape) for EtherCAT.
Cable with Connectors
Item Appearance Recommended Cable Model
manufacturer length [m] *1
Cable with Connectors on Both Ends (RJ45/RJ45) 0.5 XS6W-6LSZH8SS50CM-Y
Standard RJ45 plugs type *1 1 XS6W-6LSZH8SS100CM-Y
Wire gauge and number of pairs: AWG26, 4-pair cable OMRON 2 XS6W-6LSZH8SS200CM-Y
Cable sheath material: LSZH *2
Cable color: Yellow *3 3 XS6W-6LSZH8SS300CM-Y
Cable with Connectors on Both Ends (RJ45/RJ45) 0.5 XS5W-T421-BMD-K
Rugged RJ45 plugs type *1 OMRON 1 XS5W-T421-CMD-K
Wire gauge and number of pairs: AWG22, 2-pair cable 2 XS5W-T421-DMD-K
Cable color: Light blue 5 XS5W-T421-GMD-K
Cable with Connectors on Both Ends 1 XS5W-T421-CM2-SS
(M12 Straight/M12 Straight) 2 XS5W-T421-DM2-SS
Shield Strengthening Connector cable *4 OMRON
M12/Smartclick Connectors 3 XS5W-T421-EM2-SS
Wire Gauge and Number of Pairs: AWG22, 2-pair Cable 5 XS5W-T421-GM2-SS
Cable color: Black
Cable with Connectors on Both Ends 0.5 XS5W-T421-BMC-SS
(M12 Straight/RJ45) 1 XS5W-T421-CMC-SS
Shield Strengthening Connector cable *4 2 XS5W-T421-DMC-SS
M12/Smartclick Connectors OMRON 3 XS5W-T421-EMC-SS
Rugged RJ45 plugs type
Wire Gauge and Number of Pairs: AWG22, 2-pair Cable 5 XS5W-T421-GMC-SS
Cable color: Black 10 XS5W-T421-JMC-SS
*1. Standard type cables length 0.2, 0.3, 0.5, 1, 1.5, 2, 3, 5, 7.5, 10, 15 and 20 m are available.
Rugged type cables length 0.3, 0.5, 1, 2, 3, 5, 10 and 15 m are available.
For details, refer to Cat.No.G019.
*2. The lineup features Low Smoke Zero Halogen cables for in-cabinet use and PUR cables for out-of-cabinet use. Although the LSZH cable is
single shielded, its communications and noise characteristics meet the standards.
*3. Cables colors are available in blue, yellow, or Green.
*4. For details, contact your OMRON representative.
Cables / Connectors
Wire Gauge and Number of Pairs: AWG24, 4-pair Cable
Item Appearance Recommended manufacturer Model
- Hitachi Metals, Ltd. NETSTAR-C5E SAB 0.5 × 4P*
Cables - Kuramo Electric Co. KETH-SB*
- SWCC Showa Cable Systems Co. FAE-5004*
RJ45 Connectors - Panduit Corporation MPS588-C*
* We recommend you to use above cable and connector together.
Wire Gauge and Number of Pairs: AWG22, 2-pair Cable
Item Appearance Recommended manufacturer Model
Cables - Kuramo Electric Co. KETH-PSB-OMR*
- JMACS Japan Co., Ltd. PNET/B*
RJ45 Assembly OMRON XS6G-T421-1*
* We recommend you to use above cable and connector together.
Note: Connect both ends of cable shielded wires to the connector hoods.
Product name Specification Model Standards
Unit/Terminal Block Coding Pins Pins for 10 Units NX-AUX02 ---
(30 terminal block pins and 30 Unit pins)
Product Name No. of terminals Ground terminal mark Terminal current Model Standards
Terminal Block 8 Present 10 A NX-TBC082 ---
End Cover (NX-END01)
An End Cover is connected to the end of the EtherCAT Slave Terminal.
One End Cover is provided together with the EtherCAT Coupler Unit.
Enclosure Mounted in a panel
Grounding method Ground to 100 Ω or less
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.
Operating Pollution degree Pollution degree 2 or less: Conforms to JIS B3502 and IEC 61131-2.
environment 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
Conforms to IEC 60068-2-6.
Vibration resistance 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 (UL 508 or UL61010-2-201), ANSI/ISA 12.12.01,
EU: EN 61131-2, C-Tick or RCM, KC Registration, NK, and LR
* Refer to the OMRON website (http://www.ia.omron.com/) or consult your OMRON representative for the most recent applicable standards for each model.
EtherCAT Coupler Unit NX-ECC201/NX-ECC202/NX-ECC203
NX-ECC201 NX-ECC202 NX-ECC203
Number of connectable NX Units 63 Units max.*1
Send/receive PDO data sizes Input: 1,024 bytes max. (including input data, status, and unused areas)
Output: 1,024 bytes max. (including output data and unused areas)
Mailbox data size Input: 256 bytes
Output: 256 bytes
Mailbox Emergency messages and SDO requests
• Free-Run refreshing • Free-Run refreshing
• Synchronous I/O refreshing
Refreshing methods *2 • Synchronous I/O refreshing • Time stamp refreshing
• Task period prioritized
• Time stamp refreshing refreshing
When the settable node address range for the built-in EtherCAT port is 1 to 512*3
• Set on switches: 1 to 199
• Set with the Sysmac Studio: 1 to 512
Node address setting range
When the settable node address range for the built-in EtherCAT port is 1 to 192*3
• Set on switches: 1 to 192
• Set with the Sysmac Studio: 1 to 192
I/O jitter performance Inputs: 1 μs max.
Outputs: 1 μs max.
Communications cycle in DC Mode 250 to 4,000 μs*4 *5 125 to 10,000 μs*4 *5 *6
Power supply voltage 24 VDC (20.4 to 28.8 VDC)
NX Unit power supply capacity 10 W max.
Unit power Refer to Installation orientation and restrictions for details.
supply *7 NX Unit power supply efficiency 70%
Isolation method No isolation between NX Unit power supply and Unit power supply terminals
Current capacity of power supply 4 A max.
I/O power Power supply voltage 5 to 24 VDC (4.5 to 28.8 VDC) *8
supply *7 Maximum I/O power supply current 4A 10 A
Current capacity of power supply terminals 4 A max. 10 A max.
NX Unit power consumption 1.45 W max. 1.25 W max.
Current consumption from I/O power supply 10 mA max. (for 24 VDC)
Dielectric strength 510 VAC for 1 min, leakage current: 5 mA max. (between isolated circuits)
Insulation resistance 100 VDC, 20 MΩ min. (between isolated circuits)
*1. Refer to the NX-series Safety Control Units User’s Manual (Cat. No. Z930) for the number of Safety Control Units that can be connected.
*2. This function was added or improved for a version upgrade. Refer to the NX-series EtherCAT Coupler Unit User’s Manual (Cat. No. W519) for
information on version upgrades.
*3. The range of node addresses that can be set depends on the model of the built-in EtherCAT port. For the node address ranges that can be
set for a built-in EtherCAT port, refer to the user's manual for the built-in EtherCAT port on the connected CPU Unit or Industrial PC.
*4. This depends on the specifications of the EtherCAT master. For example, the values are as follows when the EtherCAT Coupler Unit is
connected to the built-in EtherCAT port on an NJ5-series CPU Unit: 500 μs, 1,000 μs, 2,000 μs, and 4,000 μs. For the specifications of the
built-in EtherCAT port, refer to the user's manual for the built-in EtherCAT port on the connected CPU Unit or the Industrial PC.
*5. This depends on the Unit configuration.
*6. There are restrictions in the communications cycles that you can set for some of the NX Units. If you use any of those NX Units, set a
communications cycle that will satisfy the specifications for the refresh cycles that can be executed by the NX Unit. Refer to the appendix of
the NX-series Data Reference Manual (Cat. No. W525-E1-07 or later) to see if there are restrictions on any specific NX Units. For information
on the communications cycles that you can set, refer to the user’s manuals for the NX Units.
*7. Refer to the NX-series EtherCAT Coupler Unit User’s Manual (Cat. No. W519) for procedures for designing the Unit power supply system and
I/O power supply system.
*8. Use a voltage that is appropriate for the I/O circuits of the NX Units and the connected external devices.
NX-ECC201 NX-ECC202 NX-ECC203
For EtherCAT communications.
• RJ45 × 2 (shielded)
• IN: EtherCAT input data, OUT: EtherCAT output data
External connection terminals Screwless Clamping Terminal Block
For Unit power supply, I/O power supply, and grounding. Removable.
Peripheral USB Port
For Sysmac Studio connection.
• Physical layer: USB 2.0-compliant, B-type connector
• Transmission distance: 5 m max.
Dimensions 46 × 100 × 71 mm (W×H×D)
Weight 170 g max.
Installation orientation: 6 possible orientations
Used in the upright installation orientation.
10 W output, 40ºC
Output power [W]
10 8.5 W output, 55ºC
0 10 20 30 40 45 50 55 60
Installation orientation and restrictions Ambient temperature [ºC]
Used in another orientation other than the upright installation orientation.
Output power [W] 10 W output, 40ºC
8 6.0 W output, 55ºC
0 10 20 30 40 45 50 55 60
Ambient temperature [ºC]
USB port Internal
IN communications circuits
UV UNIT PWR LED NX Unit
Non-isolated power supply +
Circuit layout UG power supply
circuits NX Unit NX bus
UG power supply - connector
Terminal IOV I./O power
block supply +
IOG I/O power
I/O PWR LED supply -
DIN Track contact plate
NX-ECC201 NX-ECC202 NX-ECC203
A1 B1 Through-wiring
UV UV for unwired
Unit power supply terminals.
Terminal arrangement IOV IOG
I./O power supply
(5 to 24 VDC)
Ground to 100Ω A8 B8
Accessory End Cover (NX-END01): 1
EtherCAT Communications Specifications
Communications standard IEC 61158 Type 12
Physical layer 100BASE-TX (IEEE 802.3)
Baud rate 100 Mbps
Topology Depends on the specifications of the EtherCAT master.
Transmission media Category 5 or higher twisted-pair cable (Recommended cable: double-shielded cable
with aluminum tape and braiding)
Transmission distance Distance between nodes: 100 m or less
Corresponding versions *1
Model number of Unit Using an NX-series CPU Unit Using an NJ-series CPU Unit Using an NY-series Industrial PC
EtherCAT Coupler Unit version Unit version of Sysmac Studio Unit version of Sysmac Studio Unit version of Sysmac Studio
CPU Unit version CPU Unit version Industrial PC version
Ver. 1.2 Ver. 1.07 or later Ver. 1.08 or higher
NX-ECC201 Ver. 1.1 Ver. 1.06 or later Ver. 1.07 or higher
Ver. 1.0 Ver. 1.13 or higher Ver. 1.05 or later Ver. 1.06 or higher Ver. 1.17 or higher
NX-ECC202 Ver. 1.2 Ver. 1.08 or higher
*2 Ver. 1.10 or later Ver. 1.12 or later
Ver. 1.5 Ver. 1.19 or higher Ver. 1.07 or later Ver. 1.19 or higher Ver. 1.19 or higher
NX-ECC203 Ver. 1.4 Ver. 1.16 or higher Ver. 1.16 or higher
Ver. 1.3 Ver. 1.13 or higher Ver. 1.13 or higher Ver. 1.17 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
*2 For the NX-ECC202, there is no unit version of 1.1 or earlier.
*3 For the NX-ECC203, there is no unit version of 1.2 or earlier.
EtherCAT Coupler Unit NX-ECC20@
Symbol Name Function
(A) NX bus connector This connector is used to connect each Unit.
(B) Indicators The indicators show the current operating status of the Unit.
(C) Communications connectors These connectors are connected to the communications cables of the EtherCAT network.
There are two connectors, one for the input port and one for the output port.
(D) Peripheral USB port This port is used to connect to the Sysmac Studio Support Software.
(E) Terminal block The terminal block is used to connect external devices.
The number of terminals depends on the type of Unit.
(F) Rotary switches These rotary switches are used to set the 1s digit and 10s digit of the node address of the EtherCAT Coupler
Unit as an EtherCAT slave. The address is set in decimal.
(G) DIP switch The DIP switch is used to set the 100s digit of the node address of the EtherCAT Coupler Unit as an EtherCAT
A8 B8 (D)
Symbol Name Function
The terminal numbers (A1 to A8 and B1 to B8) are displayed.
(A) Terminal number indications The terminal number indicators are the same regardless of the number of terminals on the terminal block, as
(B) Release holes Insert a flat-blade screwdriver into these holes to connect and remove the wires.
(C) Terminal holes The wires are inserted into these holes.
(D) Ground terminal mark This mark indicates the ground terminals. Only the NX-TBC082 has this mark.
Applicable Terminal Blocks for Each Unit Model
Current capacity of Terminal Blocks
Unit model Unit's power supply terminals
Unit power supply I/O power supply Model No. of terminals Ground terminal Terminal current
NX-ECC201 4A NX-TBC082 8 Present 10 A
NX-ECC202 or 4A 10 A NX-TBC082 8 Present 10 A
If you use ferrules, attach the twisted wires to them.
Observe the application instructions for your ferrules for the wire stripping length when attaching ferrules.
Always use plated one-pin ferrules. Do not use unplated ferrules or two-pin ferrules.
The applicable ferrules, wires, and crimping tool are given in the following table.
Terminal types Manufacturer Ferrule model Applicable wire Crimping tool
Terminals other Phoenix AI0,34-8 0.34 (#22) Phoenix Contact (The figure in parentheses is the applicable wire
than ground Contact AI0,5-8 0.5 (#20) size.)
terminals AI0,5-10 CRIMPFOX 6 (0.25 to 6 mm2, AWG 24 to 10)
AI0,75-8 0.75 (#18)
AI1,0-8 1.0 (#18)
AI1,5-8 1.5 (#16)
Ground AI2,5-10 2.0 *1
Terminals other Weidmuller H0.14/12 0.14 (#26) Weidmueller (The figure in parentheses is the applicable wire size.)
than ground H0.25/12 0.25 (#24) PZ6 Roto (0.14 to 6 mm2, AWG 26 to 10)
terminals H0.34/12 0.34 (#22)
H0.5/14 0.5 (#20)
H0.75/14 0.75 (#18)
H1.0/14 1.0 (#18)
H1.5/14 1.5 (#16)
*1. Some AWG 14 wires exceed 2.0 mm2 and cannot be used in the screwless clamping terminal block.
When you use any ferrules other than those in the above table, crimp them to the twisted wires so that the following processed dimensions are achieved.
8 to 10 mm
1.6 mm max.
(Terminals other than ground terminals)
2.0 mm max. 2.4 mm max.
(Ground terminals) (Terminals other than ground terminals)
2.7 mm max.
Using Twisted Wires/Solid Wires
If you use the twisted wires or the solid wires, use the following table to determine the correct wire specifications.
Terminals Wire type
Twisted wires Solid wire Wire size Conductor length
Classification Current capacity Plated Unplated Plated Unplated
2 A max. Possible Possible Possible
All terminals except Greater than Possible Possible 0.08 to 1.5 mm2
ground terminals 2 A and 4 A or less Not *1 Not AWG28 to 16 8 to 10 mm
Greater than Possible Possible Not Possible
4A *1 Possible
Ground terminals --- Possible Possible Possible Possible 2.0 mm2 9 to 10 mm
*1 Secure wires to the screwless clamping terminal block. Refer to the Securing Wires in the USER'S MANUAL for how to secure wires.
*2 With the NX-TB@@@1 Terminal Block, use twisted wires to connect the ground terminal. Do not use a solid wire.
Conductor length (stripping length)
If more than 2 A will flow on the wires, use plated wires or use ferrules.
Dimensions (Unit: mm)
EtherCAT Coupler Unit
● EtherCAT Coupler Unit Only
1.5 65.2 0.55 *
* The dimension is 1.35 mm for Units with lot numbers through December 2014.
● With Cables Connected
100 to 120 *2
*1. This dimension depends on the specifications of the commercially available USB cable. Check the specifications of the USB cable that is used.
*2. This is the dimension from the back of the Unit to the communications cables.
• 100 mm: When an MPS588-C Connector is used.
• 120 mm: When an XS6G-T421-1 Connector is used.
* This is the shape for Units with lot numbers through December 2014.
Man. No Model Manual Application Description
The following items are described: the overall
Leaning how to use an system and configuration methods of an EtherCAT
W519 NX-ECC20@ NX-series EtherCAT NX-series EtherCAT Slave Terminal (which consists of an NX-series
Coupler Unit User’s Manual Coupler Unit and EtherCAT Coupler Unit and NX Units), and
Ether-CAT Slave Terminals information on hardware, setup, and functions to set
up, control, and monitor NX Units through EtherCAT.
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Read and understand this catalog.
Please read and understand this catalog before purchasing the products. Please consult your OMRON representative if you
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Product specifications and accessories may be changed at any time based on improvements and other reasons. It is our
practice to change part numbers when published ratings or features are changed, or when significant construction changes are
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In the interest of product improvement, specifications are subject to change without notice.
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