Model Definition

490: Modicon network accessory series code

NAA: Modbus Plus signal repeater category

27102: Enhanced version of Modbus Plus repeater

Technical Specifications

Hardware & Interface

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

Ports: Two independent Modbus Plus ports for segment interconnection

Connection: Screw terminal blocks for field wiring

Operating Voltage: 24 V DC

Power Consumption: Low power consumption

Dimensions: Standard industrial enclosure

Weight: ~0.36 kg

Environmental & Performance

Operating Temp: 0 °C to +60 °C

Storage Temp: -25 °C to +80 °C

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

Electrical Isolation: Full galvanic isolation between two network segments

Signal Processing: Optimized circuit for stronger anti-interference capability

Core Functions

Signal Amplification: Recover and amplify attenuated signals for long-distance transmission

Segment Isolation: Block interference and prevent faults on one segment from spreading

Network Expansion: Expand total node quantity and coverage of Modbus Plus network

Stable Transmission: Maintain reliable communication under harsh industrial conditions

Application Scenarios

Long-distance Modbus Plus network deployment in large factories

Multi-segment networking for large-scale Modicon PLC systems

Maintenance and retrofit of legacy Modbus Plus production lines

Industrial sites with severe electromagnetic interference

Usage & Maintenance

Mount the unit on standard DIN rail inside control cabinets

Apply 24 V DC power and connect Modbus Plus cables to designated terminals

Inspect wiring and status indicators periodically during operation

Keep the unit well ventilated and free of dust

Upgrade to modern Ethernet solutions when renovating the whole system