Model Definition

490: Modicon network accessory series code

NAA: Modbus Plus repeater type

27106: Model designation for Modbus Plus network repeater

Technical Specifications

Hardware & Interface

Protocol: Modbus Plus (MB+), 1 Mbps baud rate

Ports: Two independent ports for connecting separate network segments

Connection: Screw terminal blocks for field wiring

Operating Voltage: 24 V DC

Power Consumption: Low power consumption

Weight: ~0.37 kg

Dimensions: Standard industrial enclosure

Environmental & Performance

Operating Temp: 0 °C to +60 °C

Storage Temp: -25 °C to +80 °C

Relative Humidity: 5% to 95%, non-condensing

Isolation: Full galvanic isolation between two network segments

Anti-interference: Enhanced circuit design for harsh industrial environments

Core Functions

Signal Amplification: Recovers and amplifies attenuated signals for long-distance transmission

Network Isolation: Blocks electrical interference and restricts faults to individual segments

Network Expansion: Increases total coverage and maximum node quantity of MB+ networks

Stable Communication: Ensures reliable data transmission in complex field conditions

Application Scenarios

Long-distance Modbus Plus network deployment in industrial facilities

Multi-segment networking for large Modicon PLC automation systems

Maintenance and retrofitting of legacy Modbus Plus production lines

Operation in sites with strong electromagnetic interference

Usage & Maintenance

Mount the device on standard DIN rail inside control cabinets

Connect 24 V DC power and Modbus Plus cables to corresponding terminals

Check wiring and status indicators periodically during operation

Keep the unit well ventilated and free of dust

Upgrade to modern Ethernet communication devices during system renovation