Omron CS1W-ETN21 CS Series Ethernet Unit

Only 3 item(s) left in stock

Manufacturer: Omron
Product No.: CS1W-ETN21
Country of origin:Japan
Product Type: Ethernet Communication Modules
Payment: T/T, Western Union
Weight: 1200g
Dimensions: 35 mm x 130 mm x 101 mm
Shipping port: Xiamen
Warranty: 12 months

Description

Integrating programmable logic controllers into enterprise networks requires reliable, high-speed communication interfaces. The Omron CS1W-ETN21 is a robust Ethernet unit designed specifically for the Omron CS-series PLCs. Acting as a CPU Bus Unit, this module provides 100BASE-TX (and 10BASE-T) communication interfaces to seamlessly bridge your industrial automation setup with local area networks, SCADA systems, and high-level industrial software.

With its robust support for various protocols and communication services, the CS1W-ETN21 enables advanced operations such as FINS (Factory Interface Network Service) communications, TCP/IP and UDP/IP socket services, and an integrated FTP server. This versatility allows engineering teams to perform remote programming, diagnostics, and high-capacity data transfers with minimal system overhead.

Features

Compatible with Omron CS1-series PLC systems as a CPU Bus Unit.
Supports dual-rate physical connections: 100BASE-TX and 10BASE-T.
Supports up to 4 Ethernet modules per CPU system (including Expansion Racks) for scalable network architectures.
Embedded FTP server functionality allows direct file transfers of PLC memory files.
Enables FINS messaging over both TCP/IP and UDP/IP protocols.
Comprehensive diagnostic and monitoring capabilities through integrated status LEDs.

Applications

High-speed manufacturing data collection and factory-floor integration.
SCADA and HMI communications in automotive, food & beverage, and material handling systems.
Remote PLC programming, monitoring, and program backup operations.
Data exchange between disparate distributed control systems over Ethernet networks.

Technical Specifications

Manufacturer	Omron
Model / Part Number	CS1W-ETN21
Unit Classification	CS-series CPU Bus Unit
Physical Layer	100BASE-TX, 10BASE-T
Transmission Media	Category 5 or higher twisted-pair cable (shielded)
Maximum Number of Units	4 units maximum (including Expansion Racks)
Current Consumption	380 mA maximum at 5 V DC
Supported Services	FINS communications (TCP/IP and UDP/IP), FTP server, Socket services, Mail send/receive, DNS client
Dimensions (W x H x D)	35 mm x 130 mm x 101 mm

Connections and Interfaces

Interface / Indicator	Description
RJ45 Port	8-pin modular connector for 100BASE-TX/10BASE-T Ethernet connection
RUN LED	Green indicator showing normal unit operation status
ERC LED	Red indicator signaling an internal unit error or configuration issue
ERH LED	Red indicator signaling an error in CPU Bus Unit communication or setup
LNK/ACT LED	Yellow indicator displaying network link establishment and transmission activity

Installation Guidelines

Ensure the PLC rack power supply is completely switched off before inserting or removing the Ethernet unit.
Securely mount the unit into the assigned CPU Bus Unit slot on the CS1 CPU Rack or Expansion Rack.
Use high-quality shielded twisted-pair (STP) Category 5 (or higher) cables for 100BASE-TX connections to prevent electromagnetic interference in high-noise environments.
Properly ground the PLC rack system to the industrial-grade earth ground terminal to stabilize communications and prevent transient voltage damage.

Compliance and Certifications

CE Compliant
UL Listed
cULus Certification

Key Features:

#Ethernet Communication Modules #Omron CS Series

What is the primary function of the Omron CS1W-ETN21 Ethernet unit?

The Omron CS1W-ETN21 is a CS-series CPU Bus Unit that provides 100BASE-TX/10BASE-T Ethernet connectivity for Omron CS1-series PLC systems, enabling high-speed FINS communications, FTP file transfers, and socket services.

How many CS1W-ETN21 units can be installed on a single CS-series system?

A maximum of 4 Ethernet units can be mounted per CS-series PLC system, including those located on the main CPU Rack and any attached Expansion Racks.

What is the current consumption of the CS1W-ETN21 module?

The module has a maximum current consumption of 380 mA at 5 V DC, drawn from the internal power supply of the PLC backplane.

Does this Ethernet unit support remote programming and monitoring?

Yes, using Omron CX-Programmer or Sysmac Studio over FINS TCP/IP or UDP/IP protocols, you can perform comprehensive remote programming, debugging, and diagnostics.

Global Express Shipping

Standard Delivery: 4-6 Business Days via DHL, FedEx, and UPS.
Express Dispatch: Same-day dispatch for in-stock orders placed before 2:00 PM (GMT+8).
Worldwide Coverage: Serving over 150 countries, including rapid delivery to Saudi Arabia and UAE.

Returns & Warranty

30-Day Guarantee: Returns accepted for in-stock products in original, factory-sealed packaging.
12-Month Warranty: Every industrial component is backed by our professional technical warranty.

Orders are processed and delivered Monday-Friday (excluding public holidays).

For full eligibility, restocking fees, and international return details, please view our official Refund & Return Policy .

TECHNICAL SPECIFICATIONS

Country of origin

Technical knowledge

Electric Actuators Designed to Replace Fluids: Hands-on Tutorial

Electric Actuators Designed to Replace Fluid Power Systems: A Practical Industrial Automation Guide

This article explains how integrated electric actuators, such as SMC’s e-Actuator series, are transforming industrial motion control by replacing traditional pneumatic and hydraulic systems. It...

June 23, 2026

$Math Operations Using OpenPLC for Industrial Automation Applications$

Omron CS1W-ETN21 CS Series Ethernet Unit