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The Allen Bradley 1786-RPCD ControlNet Dual Copper Repeater Module is a high-reliability communication component designed to extend, regenerate, and stabilize ControlNet coaxial networks in industrial automation systems. It plays a critical role in ensuring deterministic data transmission across large-scale distributed control architectures where network integrity and signal timing are essential.

This module is typically installed alongside a 1786-RPA repeater adapter and is widely used in manufacturing plants, process industries, and infrastructure systems that depend on ControlNet’s high-speed, time-synchronized communication backbone. It enables engineers to expand network topology, improve signal quality, and integrate multiple coaxial segments without degrading performance.

Technical Specifications

Specification	Details
Manufacturer	Allen Bradley (Rockwell Automation)
Model Number	1786-RPCD
Product Family	ControlNet
Module Type	Dual Copper Coaxial Repeater Module
Communication Media	RG-6 Coaxial Cable
Network Type	ControlNet Deterministic Network
Number of Ports	2 Coaxial Channels
Cable Impedance	75 Ohm
Power Supply	Supplied via 1786-RPA Repeater Adapter
Backplane Current	Approx. 400 mA @ 5 V DC
Power Consumption	Approx. 2 W
Signal Function	Regeneration & Retiming
Mounting Method	DIN Rail (via repeater adapter)
Operating Temperature	0°C to 60°C
Enclosure Type	Open-style (installed in cabinet)

Physical Dimensions & Weight

Mechanical Parameter	Specification
Overall Dimensions (L × W × H)	Approx. 134 × 134 × 91 mm
Net Weight	Approx. 0.28 kg

Recommended Related Models

The 1786-RPCD is typically deployed within a full ControlNet infrastructure ecosystem to ensure stable and scalable network performance.

Related Model	Description
1786-RPA	ControlNet Repeater Adapter
1786-RPFS	Fiber Optic Repeater Module
1786-RPFM	Fiber Media Module
1786-RPFRL	Long-Distance Fiber Repeater
1786-RPFRXL	Extended Fiber Ring Repeater
1786-BNC	Coaxial Connector
1786-XT	ControlNet Terminator
1786-TPS	ControlNet Tap Module
1756-CN2	ControlLogix ControlNet Module
1756-EN2TR	Ethernet/IP Communication Module

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Industrial Applications

The Allen Bradley 1786-RPCD is used in ControlNet-based industrial networks where stable, long-distance, and deterministic communication is required.

Typical applications include:

Large-scale factory automation systems
Automotive manufacturing lines
Oil and gas distributed control systems
Water and wastewater treatment plants
Power generation and utility monitoring systems
Mining and heavy equipment automation
Packaging and logistics systems
Chemical processing facilities
Industrial network segmentation projects
Legacy ControlNet infrastructure maintenance

Its ability to regenerate and retime signals ensures stable communication performance across complex multi-segment networks.

Key Advantages

High-Integrity Signal Regeneration

The 1786-RPCD restores and retimes ControlNet signals, ensuring data integrity across long or segmented coaxial networks.

Scalable Network Architecture

Supports expansion of ControlNet systems using multi-segment coaxial layouts and hub-based topologies.

Industrial-Grade Stability

Designed for harsh environments, maintaining reliable performance under electrical noise, vibration, and temperature fluctuations.

Flexible System Integration

Works seamlessly with repeater adapters and other ControlNet infrastructure components for modular network design.

Improved Network Distance Capability

Enables multiple 1000-meter coaxial segments to be integrated into a single deterministic communication system.

Technical FAQs

1. What is the Allen Bradley 1786-RPCD used for?

It is used to extend and regenerate signals in ControlNet industrial communication networks.

2. How many communication channels does it have?

The module features two coaxial communication ports.

3. Does the 1786-RPCD require external power?

It is powered through the 1786-RPA repeater adapter, not directly from an external supply.

4. What type of cable is used?

It uses RG-6 coaxial cable with 75-ohm impedance.

5. What is the main function of this module?

Its main function is signal regeneration and network extension in ControlNet systems.

6. Can it support long-distance network design?

Yes. It allows multiple long coaxial segments to be connected for extended network coverage.

7. Is it compatible with fiber networks?

Yes, when used with appropriate ControlNet fiber modules in a hybrid architecture.

8. What is the operating temperature range?

It operates from 0°C to 60°C in industrial environments.

9. Is the module still widely used today?

It is mainly used in legacy ControlNet installations and industrial maintenance systems.

10. Why is the 1786-RPCD important in industrial automation?

Because it ensures stable, synchronized, and reliable communication across distributed ControlNet networks, which is essential for deterministic control systems.

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