Omron CJ1W-ETN21 CJ Series Ethernet Unit

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Manufacturer: Omron
Product No.: CJ1W-ETN21
Country of origin:Nhật Bản
Product Type: PLC Ethernet Modules
Payment: T/T, Western Union
Weight: 100g
Shipping port: Xiamen
Warranty: 12 months

Description

Facilitating seamless network integration, the Omron CJ1W-ETN21 Ethernet communications module links CJ-series controllers to higher-level enterprise systems and peer control networks. This CPU Bus Unit mounts directly onto a CJ-series CPU Rack or Expansion Rack, providing dedicated 100Base-TX and 10Base-T physical interface ports. Engineered for stable industrial data exchange, the module supports standard TCP/IP and UDP/IP protocols, allowing multiple simultaneous socket connections and reliable PLC-to-PLC data link synchronization.

Features

Classified as a standard CJ-series CPU Bus Unit for seamless backplane integration.
Supports auto-negotiating 100Base-TX and 10Base-T Ethernet connections.
Utilizes standard star network topology for structured cabling layouts.
Allows transmission distances up to 100 meters between the node and network hub without signal degradation.
Low energy footprint, drawing a maximum of 370 mA from the internal 5 V DC rack power supply.

Applications

SCADA, HMI, and plant-level supervisory control system interfacing.
Distributed peer-to-peer PLC data exchange across manufacturing zones.
Remote programming, online diagnostics, and program uploads/downloads via CX-Programmer.

Technical Specifications

Parameter	Specification
Manufacturer	Omron
Model Number	CJ1W-ETN21
Unit Classification	CJ-series CPU Bus Unit
Physical Layer / Port Type	100Base-TX (Backward compatible with 10Base-T)
Modulation Method	Baseband
Transmission Topology	Star form
Maximum Cable Distance	100 meters (distance between hub and node)
Mounting Location	CPU Rack or Expansion Rack
Current Consumption	370 mA maximum at 5 V DC
Net Unit Weight	0.10 kg
Shipping Weight (Calculated)	1.5 kg

Alternative Models & Compatibility

The CJ1W-ETN21 replaces older-generation CJ1W-ETN11 models. When replacing an ETN11 module, verify the allocation of DM area words and system settings in the CPU, as additional routing and socket configuration blocks are enabled in the ETN21 firmware structure.

Application Pitfalls & Engineering Notes

To ensure stable communication under maximum industrial traffic load, the internal 5 V DC power draw must be accounted for during total rack power budget calculations. Ensure that the total 5 V DC current drawn by all modules connected to the CPU or Expansion Rack does not exceed the rated output capacity of the installed power supply module.

Commissioning & Wiring Tips

Use high-quality double-shielded twisted pair (STP) Category 5 (or higher) cables for connection to the network switch. Ground the cable shield properly at the network switch side. Avoid running Ethernet communication cables parallel to high-voltage power lines or variable frequency drive (VFD) output cables to minimize high-frequency electromagnetic interference.

Installation Guidelines

CRITICAL WARNING

Prior to physically inserting or removing this module from the backplane, completely shut off the power supply to the entire PLC rack. Hot-swapping the CJ1W-ETN21 can lead to permanent damage to the CPU backplane interface, corrupt volatile memory registers, or trigger immediate system-wide CPU bus errors.

1 Locate an available CPU Bus Unit slot on either the CPU Rack or an Expansion Rack. Remove the dust covers if applicable.

2 Align the upper and lower guides of the module with the backplane slots. Carefully press the unit straight back until the connectors engage fully and the lock levers click into place.

3 Set the Unit Number rotary switch on the front panel of the module using a small flathead screwdriver. Ensure this unit number is unique on the bus and matches your I/O table configurations.

4 Insert the RJ45 industrial Ethernet connector into the front interface port until you hear a solid click. Secure the cable to a wire tray or cabinet bracket to avoid physical strain on the port.

Key Features:

#Omron CJ Series #PLC Ethernet Modules

Can I replace an old CJ1W-ETN11 with a CJ1W-ETN21 directly?

Yes, but you must review the CPU's DM area and routing tables. The ETN21 model contains updated firmware and parameter settings that may require small logic modifications or address reallocation in CX-Programmer.

What is the maximum current draw of the CJ1W-ETN21 from the rack?

The module draws a maximum current of 370 mA at 5 V DC from the backplane power supply. Ensure your system's power supply module has enough headroom.

What type of Ethernet cables are recommended for the CJ1W-ETN21?

Always use industrial-grade Shielded Twisted Pair (STP) Category 5 (or higher) cables with RJ45 connectors to prevent electromagnetic interference in industrial environments.

Is hot-swapping supported for the CJ1W-ETN21 module?

No. The CJ-series rack must be completely powered off before inserting or removing any CPU Bus Unit. Failure to de-energize can damage the module or backplane connectors.

Vận chuyển nhanh toàn cầu

Giao hàng tiêu chuẩn: 4-6 ngày làm việc qua DHL, FedEx và UPS.
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Phủ sóng toàn cầu: Phục vụ hơn 150 quốc gia, bao gồm giao hàng nhanh đến Saudi Arabia và UAE.

Trả hàng & Bảo hành

Đảm bảo 30 ngày: Chấp nhận trả hàng cho sản phẩm có sẵn trong kho với bao bì nguyên bản, niêm phong từ nhà máy.
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Để biết đầy đủ điều kiện, phí lưu kho và chi tiết trả hàng quốc tế, vui lòng xem trang chính thức của chúng tôi Chính sách Hoàn tiền & Trả hàng .

TECHNICAL SPECIFICATIONS

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Omron CJ1W-ETN21 CJ Series Ethernet Unit