Description
The Schneider Electric 490NRP25400 is a Modicon Modbus Plus fiber-optic repeater / line-drop transceiver. It converts between the electrical Modbus Plus network and fiber-optic communication, allowing Modbus Plus networks to extend over longer distances while providing electrical isolation. Schneider documentation lists the 490NRP25400 as an optical fiber/copper line/drop transceiver for Modbus Plus.
The unit supports a 1 Mbit/s Modbus Plus data rate and uses a 9-pin D-sub electrical interface together with ST-type optical connectors. It is intended for panel or shelf mounting and can be used in bus and line-drop network configurations.
Schneider Electric’s current support information states that there is no replacement for 490NRP25400, making this part especially relevant for maintaining existing Modicon Modbus Plus installations.
Product Datasheet
| Item | Specification |
|---|---|
| Model | 490NRP25400 |
| Brand | Schneider Electric / Modicon |
| Product Type | Fiber Optic Repeater / Line-Drop Transceiver |
| Network | Modbus Plus |
| Transmission Medium | Fiber Optic + Copper |
| Application | Bus and Line Drop |
| Modbus Plus Data Rate | 1 Mbit/s |
| Electrical Interface | 9-pin D-sub |
| Optical Interface | ST-type connectors |
| Optical Wavelength | 820 nm |
| Power Supply | 115/230 VAC or 24 VDC |
| Mounting | Panel or shelf |
| Maximum Point-to-Point Distance | Up to 2 km, fiber dependent |
| Fiber Type | Multimode fiber |
| Bit Error Rate | 10⁻⁹ over specified receiver range |
| Power Loss Budget | Fiber dependent |
| Net Weight | Approx. 2.856 kg |
| Country of Origin | USA |
| Replacement Status | No direct replacement specified by Schneider |
Schneider’s product data lists a net weight of 2.856 kg, while the technical guide specifies 1 Mbit/s Modbus Plus communication, 9-pin D-sub electrical connectivity, ST optical connectors, 820 nm operation, and fiber-dependent transmission distance.
Typical Applications
- Modicon Quantum automation systems
- Modbus Plus networks
- PLC communication networks
- Long-distance industrial communication
- Oil & gas automation
- Power and utility control
- Process-control systems
- Legacy Modicon system maintenance
Installation & Use
- Verify the part number — Confirm the complete 490NRP25400 designation before installation.
- Check power configuration — The documented unit supports 115/230 VAC or 24 VDC depending on the installation configuration.
- Connect Modbus Plus — Use the correct 9-pin D-sub network connection and maintain the required Modbus Plus topology.
- Connect fiber — Use compatible multimode fiber and ST connectors. Check optical polarity and cleanliness before commissioning.
- Verify network termination — Follow the existing Modbus Plus bus/line-drop architecture and confirm termination requirements.
- Power-up test — Check power and communication indicators and verify that the repeater establishes the expected network connection.
- Communication test — Confirm PLC-to-device communication and monitor the fiber link for intermittent faults.
⚠️ Replacement note: The 490NRP25400 is a legacy Modicon component. Schneider Electric currently states that no replacement is available, so matching the original part number is particularly important when maintaining an installed Modbus Plus network.
