Model Definition

490: Modicon network accessory series code

NAA: Modbus Plus repeater type

27103: Model code for enhanced industrial Modbus Plus repeater

Technical Specifications

Hardware & Interface

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

Ports: Two independent Modbus Plus ports for network segment connection

Connection: Screw terminal blocks for field wiring

Input Voltage: 24 V DC

Power Consumption: Low power consumption

Weight: ~0.36 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: Complete galvanic isolation between two network segments

Anti-interference: Optimized circuit design for harsh industrial environments

Core Functions

Signal Amplification: Recover and amplify weakened communication signals for long-range transmission

Network Isolation: Isolate electrical interference and prevent local faults from affecting the whole network

Network Expansion: Increase the total number of nodes and coverage of Modbus Plus network

Stable Operation: Ensure continuous and reliable data transmission under complex field conditions

Application Scenarios

Long-distance Modbus Plus network deployment in large industrial workshops

Multi-segment networking for large Modicon PLC automation systems

Maintenance and retrofitting of legacy Modbus Plus production lines

Industrial sites with intensive electromagnetic interference

Usage & Maintenance

Install 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 regularly during operation

Keep the unit well ventilated and free of dust accumulation

Replace with modern Ethernet communication devices during overall system upgrade