Omron CV500-ETN01 Ethernet Unit

This is a 10 Mbps Ethernet communication module for CV-series PLCs. It supports TCP/IP, UDP/IP, FINS protocols and FTP server functions, enabling data communication between PLCs, host computers and other PLC devices.

Model Code Explanation

Code Segment	Description
CV500	Omron SYSMAC CV-series PLC module, compatible with CPU units of CV500, CV1000, CV2000 and CVM1 series
ETN	Identifier for Ethernet communication function
1	Product version number, basic Ethernet unit

Main Specifications

Item	Specifications	Remarks
Basic Features
Communication Standard	Ethernet Version 2 (IEEE 802.3 compliant)	CSMA/CD access method supported
Transmission Rate	10 Mbps (baseband transmission)	Fixed speed
Transmission Medium	Coaxial cable (10BASE5)	Maximum segment length: 500 m
Max. Nodes per Segment	100 nodes	Node spacing must be a multiple of 2.5 m
Communication Ports	8 concurrent communication ports	Supports simultaneous operation of multiple applications
Supported Protocols	TCP/IP, UDP/IP, FINS, FTP Server	Socket interface communication available
Electrical Characteristics
Power Supply	Powered by PLC backplane	Max. current consumption: 1.7 A (including transceiver)
Transceiver Power Output	12 VDC, max. 0.35 A	Powers external transceivers
Connector	15-pin D-sub (IEEE 802.3 compliant)	Equipped with slide lock mechanism
Physical Dimensions
Dimensions	34.5×250×98.1 mm (W×H×D)	Standard size for CV-series modules
Weight	500 g (approx. 1.1 lb)	Weight including housing
Mounting Position	Designated slots on CPU rack or expansion CPU rack	Depends on backplane type; maximum 4 units per PLC
Functional Features
Network Diagnostics	PING response, inter-node test, error logging	Self-diagnosis and network status monitoring supported
FTP Function	File read & write (for RAM/EEPROM cards)	Requires V1-version CPU and PLC in PROGRAM mode
Data Buffer	TCP: 4 KB (Tx/Rx); UDP: 9 KB (Tx) / 9.016 KB (Rx)	Refer to Appendix F for detailed configuration
Max. Communication Distance	2.5 km per system (multiple segments via repeaters)	Single segment: max. 500 m

Full Model List (CV-series Ethernet Units)

Model	Name	Key Features	Application Scenarios
CV500-ETN01	Ethernet Unit	Basic 10 Mbps Ethernet, 8 ports, FINS/FTP supported	Standard industrial Ethernet communication, HMI & host monitoring
CV500-ETN11	Enhanced Ethernet Unit	More protocols, higher performance	Complex network environments, multi-system integration
CV500-MC221	Ethernet Module	Rich integrated functions, Modbus TCP supported	Communication with third-party devices, SCADA integration
CV500-ETN21	High-speed Ethernet Unit	10/100 Mbps auto-negotiation	High-volume data transmission, real-time monitoring systems

> Note: Orders for CV500-ETN01 were suspended in March 2012, and full production ceased around 2017.

Replacement Models & Competitor Comparison

4.1 Official Omron Replacement Solutions

Original Model	Recommended Replacement	Compatibility	Improvements
CV500-ETN01	CS1W-ETN21	PLC needs to be upgraded to CS1 series	10/100 Mbps auto-negotiation, extended protocol support
CV500-ETN01	CJ1W-ETN21	PLC needs to be upgraded to CJ1 series	Compact size, higher performance, PROFINET supported
CV500-ETN01	Built-in Ethernet of NJ/NX Series	Full PLC upgrade required	EtherNet/IP & Gigabit Ethernet supported, integrated motion control

4.2 Cross-brand Competitor Comparison (Function Compatibility)

Brand	Model	Transmission Rate	Supported Protocols	Price Range
Siemens	CP 343-1	10/100 Mbps	TCP/IP, UDP, PROFINET	Medium-High
Mitsubishi	QJ71E71-100	10/100 Mbps	TCP/IP, UDP, MC Protocol	Medium
Schneider Electric	140NOE77101	10/100 Mbps	TCP/IP, UDP, Modbus	Medium-High
Rockwell Automation	1756-ENBT	10/100 Mbps	TCP/IP, UDP, EtherNet/IP	High
Omron	CV500-ETN01	10 Mbps	TCP/IP, UDP, FINS, FTP	Low (Discontinued)

Application Environment & Industry Cases

5.1 Applicable Scenarios

Industrial Automation Production Lines: Communication between PLCs and host monitoring systems for production data acquisition and remote control.

Process Control Systems: Data exchange among multiple PLCs for distributed control in chemical and power industries.

Logistics & Warehousing Systems: Control of AGVs and conveyors, data interaction with WMS.

Building Automation: Integration of HVAC and security systems for centralized monitoring and management.

Semiconductor Equipment: Precision control and data collection; FTP-based program update.

5.2 Not Recommended Scenarios

High-speed Real-time Control: Limited to 10 Mbps, not suitable for millisecond-level response requirements.

Modern Industrial Networks: Does not support Gigabit Ethernet, EtherNet/IP and other new protocols.

New Equipment Development: Discontinued; no official technical support or spare parts supply.

Long-distance Communication: Single segment limited to 500 m; additional repeaters increase costs for long-range transmission.

5.3 Typical Application Cases

Case 1: Monitoring System for Automotive Component Production Lines

Configuration: 3 sets of CV1000 PLC + CV500-ETN01, connected via coaxial cables

Functions: Real-time collection of stamping, welding and assembly data, uploaded to SCADA system

Advantages: 8 concurrent connections for simultaneous communication with HMI, database server and remote monitoring terminals

Key Technology: FINS for inter-PLC data sharing; FTP for remote program update

Case 2: Data Acquisition for Food & Beverage Filling Lines

Configuration: CV500 PLC + CV500-ETN01 + Barcode Reader + Weighing Sensor

Functions: Collect bottle weight, production date and batch information, transmit to MES via Ethernet

Advantages: UDP for high-speed data transmission; TCP ensures reliability of critical data

Troubleshooting: PING command and inter-node test for quick network fault diagnosis

Troubleshooting & Maintenance Guide

6.1 LED Indicator Diagnosis

Indicator	Color	Status	Meaning	Solution
RUN	Green	Off	Module not running	Check power supply and restart PLC
ERC	Red	On	Invalid node address (out of 1–126) or hardware failure	Reset node address; check module connection
ERH	Red	On	PC error, wrong unit number or I/O table setting	Verify unit number; reconfigure I/O table
ERH	Red	Blinking	IP address unset or invalid	Reconfigure IP address
SD/RD	Orange	Off	No data transmission/reception	Check network wiring and communication parameters
FTP	Orange	On	FTP server active	Normal status
TS	Orange	On	Inter-node test in progress	Normal status

6.2 Common Faults & Solutions

Fault Phenomenon	Possible Causes	Solutions
Communication failure	1. Conflicting unit/node number	1. Power off and reset unit number (00–15) & node number (1–126)
	2. Incorrect IP address	2. Check for IP address conflict
	3. Loose cable connection	3. Inspect locking of 15-pin D-sub connector
	4. Defective transceiver	4. Replace with a functional transceiver
FTP transmission failure	1. Non-V1 CPU version	1. Confirm V1 CPU (e.g. CV500-CPU01-EV1)
	2. PLC not in PROGRAM mode	2. Switch PLC to PROGRAM mode
	3. Memory card write-protected	3. Disable write protection on memory card
	4. Unsupported card type	4. Use RAM or EEPROM card (EPROM is read-only)
Slow communication speed	1. Overloaded network	1. Reduce concurrent connections (≤8)
	2. Buffer overflow	2. Optimize data volume and expand buffer
	3. Excessive transmission distance	3. Shorten transceiver cable (≤50 m)
Intermittent disconnection	1. Power fluctuation	1. Stabilize PLC power supply
	2. Electromagnetic interference	2. Separate communication cables from power cables; use shielded cables
	3. Overheated transceiver	3. Ensure good ventilation for transceivers

6.3 Maintenance Schedule & Notes

Maintenance Item	Cycle	Operation Notes
Module Cleaning	Every 3 months	Power off first; remove dust with dry compressed air. Do not use liquid cleaners.
Connector Inspection	Every 6 months	Check for loose connection and pin oxidation; clean if necessary.
Network Test	Every 1 month	Run PING test and inter-node test to verify network quality.
Firmware Check	Every 1 year	Confirm firmware version; update with professional tools if required.
Spare Parts Preparation	For critical systems	Prepare replacement modules or overall upgrade plans due to product discontinuation.

Selection Guidelines & Quick Reference

7.1 Three Key Points for CV500-ETN01 Selection

PLC Compatibility: Only for CV/CVM1 series; not compatible with CS/CJ series.
Communication Demand: 10 Mbps speed and 8 concurrent ports for basic Ethernet communication.
Product Lifecycle: Discontinued. Select replacement models for new projects.

7.2 Troubleshooting Tips

LED off → Check power; LED blinking → Check IP address; steady red LED → Check parameter settings

Data transfer failure → Verify PROGRAM mode; unstable connection → Check EMI shielding; low speed → Reduce network load

7.3 Priority of Replacement Solutions

Series upgrade path: CV500 → CS1 → CJ1 → NJ/NX
Function matching: Ensure compatibility with original protocols (FINS/FTP) and new requirements
Cost evaluation: Balance the cost of module replacement and full system upgrade

Supplementary Content: Application Environment & Industry Cases

Application Environment (Compatibility & Restrictions)

1.1 Hardware & System Compatibility

PLC Platform: Exclusive to CPU racks and expansion racks of Omron CV500/CV1000/CV2000/CVM1 series. Max. 4 units per PLC.

Network Topology: 10BASE5 thick coaxial cable. Single segment: max. 500 m; node spacing: multiple of 2.5 m; max. 100 nodes per segment. Total distance up to 2.5 km with repeaters.

Communication Protocols: TCP/IP, UDP/IP, FINS, FTP Server. 8 concurrent ports for multi-device communication.

Electrical Environment: Backplane power supply (1.7 A); external transceiver: 12 VDC / 0.35 A. Operating temperature: 0–55 °C. Keep away from inverters and large motors to avoid strong electromagnetic interference.

1.2 Applicable Scenarios (Advantages)

✅ Renovation & Maintenance of Old Production Lines: Network upgrade for legacy CV-series PLCs (replacing traditional RS-232/422).

✅ Medium & Low-speed Data Acquisition: For non-real-time applications such as production status, temperature and pressure monitoring.

✅ Multi-PLC Networking: Networking of 3–10 CV-series PLCs in one workshop for FINS-based data exchange.

✅ Host Monitoring (SCADA): Data exchange between PLCs, industrial PCs and HMIs for process visualization and remote operation.

✅ Remote Program Update: Read/write CPU programs via FTP (RAM/EEPROM card), reducing on-site card plugging operations.

1.3 Restricted Scenarios (Limitations)

❌ High-speed Real-time Control: 10 Mbps bandwidth insufficient for motion control, servo synchronization and high-frequency closed-loop control (e.g. packaging machines, high-speed machine tools).

❌ New Equipment Development: Discontinued since 2012; risk of spare parts shortage and no official support.

❌ Modern Industrial Networks: Incompatible with 100 Mbps/Gigabit Ethernet, EtherNet/IP, PROFINET, Modbus TCP and other mainstream industrial protocols.

❌ Long-distance & Complex Topology: Complicated cabling for coaxial cables, poor anti-interference performance and high maintenance costs.

Major Industry Applications (Popular in 2000–2010)

2.1 Automotive Component Production Lines (Most Common)

Configuration: 3 × CV1000-CPU01-EV1 + CV500-ETN01 + 10BASE5 coaxial network + SCADA industrial PC

Process: Stamping, welding, assembly and inspection. Collect equipment status, output and yield data and upload to MES. FINS for inter-PLC safety interlock (e.g. welding stations).

Improvement: Replaced old RS-485 multi-drop network to solve slow speed and frequent disconnection. 8 concurrent ports support connection with HMI, MES and remote maintenance terminals simultaneously.

2.2 Food & Beverage Filling Lines

Configuration: CV500-CPU01 + CV500-ETN01 + Weighing Sensor + Barcode Reader + FTP Server

Process: Bottle washing, filling, capping, labeling and inspection. UDP for high-speed transmission of bottle weight, batch number and production date; TCP guarantees reliability of yield and alarm data. FTP for remote recipe update.

Value: Cost-effective PLC-Ethernet-MES closed-loop system, meeting product traceability requirements for food industry.

2.3 Chemical Process Control (Explosion-proof & High Reliability)

Configuration: Redundant CVM1-CPU21-V2 + 2 × CV500-ETN01 (main/backup) + Redundant coaxial network + DCS host

Process: Reactor temperature & pressure control, pipeline flow monitoring and valve interlock. FINS for data exchange with DCS. PING and inter-node test for fast fault location.

Environmental Adaptability: Wide temperature range and vibration resistance, suitable for dusty and humid chemical workshops.

2.4 Building Automation (HVAC & Security)

Configuration: CV2000-CPU01 + CV500-ETN01 + Air-conditioning Controller + Fire Alarm System + Access Control System

Functions: Centralized temperature & humidity control for central air conditioning, fire alarm linkage and access data upload. 8 concurrent ports manage multiple subsystems simultaneously.

Advantages: Cost-effective and reliable Ethernet solution for large buildings in the 2000s with easy maintenance.

2.5 Semiconductor Equipment (Legacy Non-critical Processes)

Configuration: CV500-CPU01-EV1 + CV500-ETN01 + Wafer Inspection Station + Data Server

Process: Status monitoring and data recording for non-critical processes such as wafer cleaning and packaging. FTP for inspection report upload and remote program download.

Note: Only applied to legacy equipment and non-high-speed processes. New devices adopt EtherNet/IP or Gigabit Ethernet.