Schneider NW-RR85-001 Modbus Plus Repeater Quantum

NW-RR85-001 Modbus Plus Repeater Assembly for Modicon Quantum

Product Introduction

The NW-RR85-001 from Schneider Electric is a dedicated Modbus Plus electrical repeater. It belongs to the Modicon Quantum automation platform. This device regenerates and retransmits Modbus Plus signals across longer distances. Therefore, it overcomes the cable length limitations of a standard single segment.

Specifically, the NW-RR85-001 accepts either 110-120V or 220-240V AC power. This dual voltage capability makes it suitable for North American and international installations. Additionally, it comes in a rack-mounted form factor. As a result, you can install it neatly inside standard Quantum control racks or enclosures.

Technical Specifications

The NW-RR85-001 delivers stable signal regeneration for Modbus Plus networks. Its key communication and electrical parameters are listed below.

• Voltage Class: 100V nominal

• Voltage Range (Selectable): 110–120V AC or 220–240V AC

• Number of Ports: 2 ports

• Transmission Medium: Coaxial cable (RG58 or similar)

• Mounting Type: Rack-mounted

• Length: 14.17 inches (360 mm)

• Width: 10.71 inches (272 mm)

• Depth: 4.8 inches (122 mm)

Furthermore, this repeater acts as a bidirectional signal amplifier. It cleans and retimes incoming Modbus Plus frames. Consequently, it extends the total network length up to 4500 feet (1371 meters) when using multiple repeaters in series.

Mechanical and Environmental Data

The NW-RR85-001 is built for industrial control rooms and equipment cabinets. Its dimensions allow standard rack installation without special tools.

• Net Weight: 5.90 lbs (2.68 kg)

• Mounting: Horizontal or vertical rack orientation

• Connectors: Two BNC-type female coaxial connectors

• Indicators: LED status for power and port activity

• Housing Material: Metal with ventilation slots

Moreover, the repeater requires no forced air cooling under normal loads. However, leave at least 2 inches of clearance around the ventilation slots for proper airflow.

Installation Guidelines for NW-RR85-001

Installing the NW-RR85-001 requires attention to termination and grounding. First, power down all connected Modbus Plus devices. Next, mount the repeater into a vacant rack slot or on a DIN rail using an adapter plate.

Then, connect the coaxial cables to the two BNC ports. Use high-quality RG58 or RG59 cables with proper 75-ohm or 93-ohm impedance. Terminate each end of the main trunk with the correct 93-ohm terminators. Finally, apply AC power to the NW-RR85-001 and check the status LEDs.

• Do not create loops in the coaxial trunk.

• Ground the repeater chassis to the control panel ground.

• Keep coaxial cables away from high-voltage AC wiring (minimum 12 inches separation).

Therefore, a correctly installed repeater boosts signal integrity without introducing data collisions.

Network Extension Rules

The NW-RR85-001 follows standard Modbus Plus repeater rules. You can place up to three repeaters in series between any two nodes. Each repeater adds roughly 450 feet (137 meters) of additional cable length.

Additionally, the total number of repeaters on a single Modbus Plus network cannot exceed 64. For most industrial systems, one or two NW-RR85-001 units are sufficient. Always draw a network diagram before installation to avoid exceeding segment length limits.

Common Applications

The NW-RR85-001 serves any facility with geographically spread Modbus Plus devices. For instance, it is widely used in municipal water distribution systems where pump stations are kilometers apart. Additionally, it suits large automotive assembly plants with multiple buildings.

Other typical applications include:

• Oil and gas pipeline monitoring stations

• Conveyor systems in distribution warehouses

• Power generation plants with remote switchgear

• Chemical processing facilities with long cable runs

Because the NW-RR85-001 is passive to higher-level protocols, it works transparently. Legacy Quantum systems continue to operate normally after repeater insertion.

Packaging List

• 1 x NW-RR85-001 Modbus Plus repeater assembly

• 1 x AC power terminal block (factory installed)

• 2 x BNC protective caps

• 1 x printed installation leaflet

Note: Certificates and warranty documents are not included in the package. Coaxial cables and terminators are sold separately.

Shipping Information

All orders for the NW-RR85-001 ship via FedEx, UPS, or DHL. Tracking numbers are provided within 24 hours. International delivery typically takes 3 to 7 business days.

Frequently Asked Questions (FAQ)

1. What is the maximum distance I can cover with the NW-RR85-001?
Each NW-RR85-001 allows you to add approximately 450 feet (137 meters) of cable between segments. With three repeaters in series, you can extend a Modbus Plus network up to 4500 feet total.

2. Can I use the NW-RR85-001 with standard Ethernet cables?
No. This repeater uses coaxial cable as the transmission medium. Specifically, it requires 93-ohm coaxial cable (RG62) or 75-ohm cable for Modbus Plus networks. Do not use twisted pair or fiber without additional converters.

3. Does the NW-RR85-001 require configuration software?
No. The NW-RR85-001 is a hardware-only repeater. It does not have an IP address or configurable registers. Simply apply power and connect the coaxial cables.

4. What do the LEDs on the NW-RR85-001 indicate?
The front panel LEDs show power status and data activity on each port. A flashing green light indicates normal traffic. A steady red light suggests a cable fault or missing terminator.

5. Can I mix 110V and 220V power sources with the same NW-RR85-001?
No. The NW-RR85-001 operates on either 110–120V or 220–240V, but not both simultaneously. Select the correct voltage range using the internal jumper or order the variant matching your facility. Always verify before applying power.