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Part of the Omron NX-Series Safety & I/O series — see the full model table, lifecycle status and replacement parts.

Omron NX-ECC203 — front face of the NX EtherCAT Coupler showing the two shielded RJ45 EtherCAT ports, the TS and RUN indicator LEDs, the rotary node-address switch and the unit version label

Omron NX-ECC203 — EtherCAT Coupler, 63 NX Units

SKU: NX-ECC203

USD 105.00

EtherCAT Coupler for NX I/O, 2 RJ45 ports, 125 us cycle, 63 NX units, 10 A I/O. In stock, China.

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Product Overview

The Omron NX-ECC203 is an NX-series EtherCAT Coupler Unit that attaches up to 63 NX I/O slices to an EtherCAT master It is manufactured by Omron Corporation. Hengyixin Automation stocks this controller in Xiamen and ships within 3-5 business days to most Asian, European, and North American ports. Specifications on this page were checked against Omron's NX-series EtherCAT Coupler Unit datasheet.

Two shielded RJ45 ports carry the EtherCAT IN and OUT lines at 100 Mbps, and from unit Ver. 1.5 the NX-ECC203 supports ring topology for cable-redundant cabinets. Cycle time is 125 to 10,000 us in DC mode, and the unit supports Free-Run, Synchronous I/O, Time-stamp, and Task-period prioritized refreshing for motion and high-speed applications.

Body size is 46 x 100 x 71 mm at 170 g. Key specs: Number of Connectable NX Units 63 NX units maximum; PDO Data Size 1,024 bytes each, input and output; Communications Cycle (DC Mode) 125 to 10,000 us; I/O Jitter 1 us input, 1 us output; Node Address Range 1-192 via the rotary switch, 1-192 via Sysmac Studio; Refreshing Methods Free-Run, Synchronous I/O, Time-stamp, Task-period prioritized; Topology Support Line, daisy-chain; ring from Ver. 1.5; Unit Power Supply 24 VDC (20.4-28.8 VDC), up to 10 W.

Key Features

  • NX-series EtherCAT Coupler with 2 shielded RJ45 ports, 100 Mbps
  • 125 to 10,000 us cycle in DC mode, 1,024 bytes PDO input and output
  • Supports ring topology from unit Ver. 1.5, plus line and daisy-chain
  • 10 W unit power, 10 A I/O power, 46 x 100 x 71 mm, 170 g
  • SKU: NX-ECC203
  • Series: NX-series EtherCAT Coupler Unit
  • Voltage: 24 VDC
  • I/O: 5 I/O

Best-Fit Applications

  • Ring-topology EtherCAT cabinet linking two NX-ECC203 couplers over a redundant trunk for a press-shop press line.
  • Distributed motion cell pairing the NX-ECC203 with NX-EC0132 encoder inputs and R88D-KN drives on a single EtherCAT trunk.
  • Modular machine retrofit where NX-IO units migrate from a legacy CJ1W to a Sysmac NJ5 without rewiring the field devices.

Buying Checklist

  • Choose the NX-ECC203 when the cabinet needs ring-topology EtherCAT redundancy or a 125 us minimum cycle.
  • Choose the NX-ECC201 instead when the cycle stays above 250 us and no ring topology is required.
  • Choose the NX-ECC202 instead when the standard 4 A I/O current is enough and you want lower cost.

Technical Specifications

Series NX-series EtherCAT Coupler Unit
Number of Connectable NX Units 63 NX units maximum
PDO Data Size 1,024 bytes each, input and output
Communications Cycle (DC Mode) 125 to 10,000 us
I/O Jitter 1 us input, 1 us output
Node Address Range 1-192 via the rotary switch, 1-192 via Sysmac Studio
Refreshing Methods Free-Run, Synchronous I/O, Time-stamp, Task-period prioritized
Topology Support Line, daisy-chain; ring from Ver. 1.5
Unit Power Supply 24 VDC (20.4-28.8 VDC), up to 10 W
I/O Power Supply 5-24 VDC (4.5-28.8 VDC), up to 10 A
NX Unit Power Consumption 1.25 W max
Dimensions 46 x 100 x 71 mm, 170 g, IP20

Manufacturer documentation

Omron's own product page, where the manufacturer's current specification and lifecycle information are published. We are an independent distributor and cannot mirror those documents; the link goes to Omron's site.

FAQ for NX-ECC203

Does the NX-ECC203 support ring topology?
Yes, from unit Ver. 1.5 and later the NX-ECC203 supports ring topology for cable-redundant EtherCAT cabinets. The Ver. 1.0 release supports line and daisy-chain only. Check the unit-version sticker on the front of the coupler to confirm the build version.
How many NX I/O units can the NX-ECC203 connect?
Up to 63 NX I/O slices per coupler. The cyclic PDO size is 1,024 bytes for input and 1,024 bytes for output. For cabinets larger than 63 slices, split across multiple NX-ECC203 couplers and connect them to the same EtherCAT master.
What is the difference between NX-ECC201, NX-ECC202 and NX-ECC203?
The 201 is the original unit at 250 to 4,000 us cycle and 4 A I/O power. The 202 extends the cycle down to 125 us. The 203 adds ring topology from Ver. 1.5 and raises the I/O current to 10 A. For most new Sysmac cabinets, pick the 203 unless the application needs no ring topology.
Can the NX-ECC203 host NX safety I/O over FSoE?
Yes - the NX-ECC203 supports FSoE when an NX-SL3300 or NX-SL3500 Safety CPU is mounted on the same rack. Safety I/O units like NX-SID800 and NX-SOD400 mount alongside standard NX I/O on the same EtherCAT sub-node. Verify Sysmac Studio V1.10 or later for full FSoE configuration.

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