Omron NX-ECC201 — EtherCAT Coupler, 63 NX Units, 4 A I/O
SKU: NX-ECC201USD 110.00
EtherCAT Coupler Unit for the NX-series I/O system, accepts up to 63 NX I/O units on the right side, 250–4000 µs communication cycle, 4 A I/O power, screwless push-in terminal block for 24 VDC supply.
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Product Overview
The NX-ECC201 is the standard EtherCAT Coupler Unit for Omron's NX-series distributed I/O system. It is the head of any remote NX slice: the EtherCAT IN port receives the network from the master (NJ501, NX102, NX1P2, or a third-party EtherCAT controller), the EtherCAT OUT port passes the network on to the next EtherCAT slave in the daisy chain, and the right-side NX bus connector distributes communication and power to up to 63 NX I/O units (digital, analog, motion, safety, communication, encoder input) plugged onto the right side of the coupler. EtherCAT cycle time is configurable from 250 µs to 4,000 µs, allowing trade-offs between I/O refresh rate and bus load.
How the NX-ECC201 differs from ECC202 and ECC203
All three couplers share the same physical size, connector layout, and EtherCAT protocol. The differences are in power handling and cycle time: NX-ECC201 (this SKU): 4 A I/O supply, 250 µs minimum cycle time, 1.45 W power consumption. NX-ECC202: 10 A I/O supply (for larger I/O banks with many 24 VDC outputs), same 250 µs minimum cycle. NX-ECC203: 4 A I/O supply (same as -201), 125 µs minimum cycle time (for high-speed applications). In practice, pick -201 unless you have either more than 4 A of I/O load or you need sub-250 µs synchronized motion I/O.
Wiring the supply and addressing
Power the NX-ECC201 with a 24 VDC supply on terminals A1 / B1 (Unit Power Supply, 24 VDC, 0.75 A) and A3 / B3 (Unit Power Supply Common, 0 V). A separate 5 to 24 VDC I/O power supply goes to A5 / B5 (I/O Power Supply) and A7 / B7 (I/O Power Supply Common) — the I/O supply feeds the digital output modules' load voltage and the analog module field-side circuitry. Both supplies can be the same 24 VDC rail, or they can be separate to allow hot-swap of the I/O supply while keeping the NX bus and CPU logic alive.
Application in a typical machine
On a packaging line or assembly cell, the NX-ECC201 sits in a remote panel about 10 to 50 metres away from the NJ501 or NX102 controller, with EtherCAT running over standard Cat-5 cable. Up to 63 NX I/O units plug onto the right side, providing hundreds of digital I/O points, analog inputs for temperature and pressure, encoder inputs for tracking, and safety I/O via NX-SL3300. The daisy-chain OUT port can pass EtherCAT to another NX slice or to a third-party EtherCAT slave (servo drive, vision system, remote I/O block) for distributed control.
Key Features
- EtherCAT Coupler Unit for the NX-series I/O system
- Accepts up to 63 NX I/O units on the right-side NX bus
- EtherCAT cycle time 250 µs to 4,000 µs
- 1,024 bytes input / 1,024 bytes output PDO size per slice
- 4 A I/O power supply for the downstream NX units
- 10 W unit power output for the NX bus logic
- Two EtherCAT ports for daisy-chain topology
- Rotary x10 / x1 ID switches for node addressing
- SKU: NX-ECC201
- Series: NX (EtherCAT Coupler)
- I/O: 1 I/O
Best-Fit Applications
- Remote I/O slice for a packaging machine 20 m from the NJ501 controller in the main panel
- Distributed I/O for an assembly cell with EtherCAT daisy-chained to two NX slices
- Mixing digital, analog, and safety I/O in one remote panel via NX-ECC201 + NX-SL3300
- Bridging NX I/O into a third-party EtherCAT master
Buying Checklist
- Pick NX-ECC201 for the standard EtherCAT coupler with 4 A I/O power
- Pick NX-ECC202 when the slice draws more than 4 A of I/O power
- Pick NX-ECC203 when you need 125 µs minimum cycle time for high-speed synchronized I/O
- Order an end cover NX-EC001 separately — required to close the right side of the NX bus
- Set the rotary ID switches before applying power; addressing on a running system requires power cycle
- Use shielded Cat-5 cable for EtherCAT runs longer than 10 m in noisy environments
Technical Specifications
| Model | NX-ECC201 |
|---|---|
| Series | NX (EtherCAT Coupler) |
| Type | EtherCAT Coupler Unit |
| EtherCAT Ports | 2 (IN and OUT, 100 Mbps) |
| Max NX Units | 63 |
| Communication Cycle | 250 to 4,000 µs |
| PDO Input Size | 1,024 bytes max |
| PDO Output Size | 1,024 bytes max |
| Unit Power Output | 5.8 VDC, 10 W max @ 40°C |
| Max I/O Power Current | 4 A |
| Dimensions (W×H×D) | 12 × 100 × 71 mm |
| Operating Temperature | 0 to +55 °C |
| Certifications | CE, UL, cULus, KC, RCM |
Resources & Downloads
FAQ for NX-ECC201
How many NX I/O units can I connect to one NX-ECC201?
Up to 63 NX units on the right side of the coupler. The limit is the NX bus capacity and the total I/O map size; each NX unit consumes some PDO bytes, and the total PDO input and output size is capped at 1,024 bytes each direction. For most combinations of digital and analog I/O, the 63-unit limit is the real boundary.
What is the difference between NX-ECC201 and NX-ECC202?
Both are standard EtherCAT couplers with the same 250–4000 µs cycle time and same NX bus interface. The difference is in I/O power handling: NX-ECC201 supplies up to 4 A to the I/O bus, NX-ECC202 supplies up to 10 A. Pick NX-ECC202 when the downstream digital output modules in the slice draw more than 4 A at 24 VDC; for most slices with mixed digital / analog I/O, the NX-ECC201 is sufficient.
Does the NX-ECC201 require a battery?
No. EtherCAT state and the NX bus topology are not retained across power cycles; the master reads the slice topology on every connection, and the I/O map is transferred with the project. There is no battery to replace on the coupler itself. The NX-AD3603 absolute encoder on absolute encoder models requires a battery in the encoder cable, not on the coupler.
Can the NX-ECC201 work with a third-party EtherCAT master?
Yes. EtherCAT is an open standard managed by the ETG (EtherCAT Technology Group), and the NX-ECC201 implements the standard ESI (EtherCAT Slave Information) file. Any EtherCAT master that imports the ESI can configure the coupler and the NX units plugged onto its right side. Sysmac Studio is required only for Omron-specific diagnostics; the basic I/O exchange uses standard PDO mapping.
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