II. Product Parameters

Model: 490NRP25400

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

Electrical Interface: 2×MB+ electrical ports (redundant)

Optical Interface: 2×ST optical interface (transmit and receive independently)

Optical Fiber Type: Multi-mode (62.5/125 μm) / Single-mode (9/125 μm) compatible

Transmission Distance: Multi-mode 500m; Single-mode up to 20km

Power Supply: 24 VDC (19.2–30 VDC), power consumption ≤ 6 W

Weight: Approximately 1.81 kg (4.00 lbs)

Size: 130 × 272 × 350 mm (wall-mounted / rack-mounted)

Operating Temperature: −20℃ ~ +60℃

Certifications: CE, UL, CSA

III. Product Specifications

Type: Fiber Line Drop Repeater (Fiber Line Drop Repeater)

Topology Support: Point-to-point, Chain, Star, Redundant Ring Network (Self-healing)

Isolation: Dual electrical / optical isolation, anti-EMI/RFI

Configuration: Plug-and-play, no software configuration required

Protection Grade: IP20 (indoor industrial environment)

IV. Series

Series归属： Modicon 490 Communication Series → NRP (Network Repeater) Sub-series

Comparison with the same series：

490NRP25300： Point-to-point fiber repeater (no splitting)

490NRP25400： Fiber splitting + Ring Network Redundancy (this model)

V. Features

✅ Dual Redundancy Design： Dual electrical ports + Dual optical ports， supports ring network self-healing， zero downtime switching

✅ Long Distance Transmission： Single-mode fiber up to 20km， breaking through the 100m limit of copper wire

✅ Multi-topology Adaptability： Supports point-to-point， chain， star， ring network， flexible networking

✅ Strong Anti-interference： Optical-electrical isolation， resisting strong electromagnetic interference from frequency converters， motors， etc.

✅ No Configuration for Operation： Plug-in and use， no programming required， reducing maintenance costs

VI. Applications

Extend the communication distance of Modbus Plus bus， achieve cross-department / inter-factory connection

Build redundant fiber ring network to enhance the reliability of MB+ network， avoid single-point failure

Electrical Isolation： Eliminate ground potential difference， protecting PLC， I/O， etc.

Signal Repeater and Splitter： Branch connections of multiple MB+ slave stations on the fiber main trunk

VII. Application Domains

Power Energy： Power plant DCS， generator control， remote I/O monitoring

Petrochemical： Refining plants， pipeline transportation， explosion-proof area communication

Metallurgy Steel： Blast furnaces， rolling mills， continuous casting lines， etc. in strong interference environments

Automotive Manufacturing： Welding， painting workshop long-distance bus communication

Water Treatment / Municipal： Sewage plants， pump stations distributed control systems