Allen-Bradley 1784-U2DHP USB to DH+ Converter | Data Highway Plus Interface Module

Allen-Bradley 1784-U2DHP USB to Data Highway Plus Converter (Industrial Communication Interface)

The Allen-Bradley 1784-U2DHP is a professional-grade USB to Data Highway Plus (DH+) converter module designed for seamless communication between modern computers and legacy Allen-Bradley PLC systems. Through USB 2.0 connectivity and optically isolated DH+ interface, this converter enables reliable programming, monitoring, and diagnostics of PLC-5, SLC 500, and other DH+ compatible controllers without requiring dedicated serial ports or ISA cards.

Ideal for industrial automation engineers, system integrators, maintenance technicians, and OEM equipment manufacturers working with building automation, manufacturing lines, water treatment facilities, and process control systems. This converter solves critical challenges including outdated serial port dependencies, electrical noise interference, compatibility issues with modern operating systems, and the need for portable programming solutions in field service environments.

Featuring plug-and-play installation, bus-powered operation, and robust optical isolation up to 2500V, the 1784-U2DHP delivers stable performance in harsh industrial environments. Compatible with RSLogix, RSLinx, and other Rockwell Automation software platforms, this module is essential for design engineers, control panel builders, system integrators, and plant maintenance teams. Contact our technical specialists for application guidance, compatibility verification, and volume pricing.

Core Features & Technical Advantages

USB 2.0 Plug-and-Play Connectivity
Eliminates the need for legacy serial ports or ISA expansion cards. Fully compatible with Windows 7/8/10/11 operating systems, enabling modern laptops and industrial PCs to communicate directly with DH+ networks through standard USB interface.

Optical Isolation Protection
Built-in 2500V optical isolation safeguards connected computers from electrical surges, ground loops, and industrial noise commonly found in factory environments, ensuring data integrity and equipment protection during programming and troubleshooting operations.

Bus-Powered Design
Draws power directly from the USB port, requiring no external power supply. This portable, self-contained design is ideal for field service technicians and mobile programming applications where AC power access may be limited.

Multi-Protocol DH+ Support
Supports Data Highway Plus communication at standard baud rates (57.6K, 115.2K, 230.4K bps), enabling full-function access to PLC-5, SLC 500, and ControlLogix processors equipped with DH+ communication modules for programming, data collection, and real-time monitoring.

Industrial-Grade Reliability
Engineered with robust components and conformal coating for operation in temperature ranges of 0°C to 60°C, humidity up to 95% non-condensing, and environments with moderate vibration and electromagnetic interference typical of industrial settings.

Seamless Software Integration
Fully compatible with RSLinx Classic, RSLogix 5, RSLogix 500, FactoryTalk View, and other Rockwell Automation programming and HMI platforms. Recognized as a standard DH+ driver, simplifying configuration and reducing setup time for experienced automation professionals.

Typical Application Scenarios

This USB to DH+ converter is engineered for environments demanding reliable communication with legacy Allen-Bradley control systems, particularly in:

Manufacturing & Production Lines
Connect to PLC-5 and SLC 500 controllers managing conveyor systems, robotic cells, packaging equipment, and assembly automation. Enables program modifications, recipe downloads, and real-time production data monitoring without disrupting operations.

Water & Wastewater Treatment Facilities
Interface with DH+ networks controlling pump stations, filtration systems, chemical dosing, and SCADA supervisory systems. Supports routine maintenance, alarm diagnostics, and seasonal programming adjustments for municipal and industrial water treatment plants.

Building Automation & HVAC Systems
Access legacy building management systems controlling chillers, boilers, air handling units, and energy management platforms. Facilitates setpoint adjustments, scheduling updates, and integration with modern BMS platforms in commercial and institutional facilities.

Oil & Gas, Chemical Processing
Maintain critical process control systems in refineries, petrochemical plants, and batch processing operations where PLC-5 controllers manage temperature, pressure, flow, and safety interlocks. Ensures compliance with safety protocols through isolated communication paths.

Field Service & Commissioning
Portable solution for automation technicians performing on-site troubleshooting, software upgrades, and system commissioning across multiple customer locations. Lightweight, USB-powered design fits easily in service kits alongside laptops and diagnostic tools.

Technical Specifications & Selection Guide

To ensure optimal compatibility and performance, review the following technical parameters:

Interface Specifications:

• Computer Interface: USB 2.0 Type-A (backward compatible with USB 1.1)
• Network Interface: Data Highway Plus (DH+) via 8-pin mini-DIN connector
• Supported Baud Rates: 57.6K, 115.2K, 230.4K bps (auto-detect)
• Isolation Voltage: 2500V RMS optical isolation between USB and DH+ sides
• Cable Length: Supports DH+ cable runs up to 3,048 meters (10,000 feet) per segment

Environmental & Mechanical:

• Operating Temperature: 0°C to 60°C (32°F to 140°F)
• Storage Temperature: -40°C to 85°C (-40°F to 185°F)
• Humidity: 5% to 95% RH, non-condensing
• Dimensions: Compact inline design, approximately 85mm × 35mm × 20mm
• Weight: Approximately 150 grams including USB cable

Compatibility & Software:

• Supported Controllers: PLC-5 family, SLC 500 series, ControlLogix with DH+ bridge modules
• Operating Systems: Windows 7, 8, 10, 11 (32-bit and 64-bit editions)
• Software Platforms: RSLinx Classic, RSLogix 5, RSLogix 500, RSLogix 5000, FactoryTalk View
• Driver Type: Standard Rockwell AB_DHP-1 driver (included with RSLinx)

Selection Recommendations:
When specifying this converter, consider the following project parameters: existing DH+ network baud rate configuration, number of nodes on the network, required cable length from converter to DH+ tap, operating system version of programming workstation, and whether multiple technicians require simultaneous access (may require additional converters). For applications involving ControlLogix or CompactLogix systems, verify that a DH+ communication module (e.g., 1756-DHRIO) is installed. Our application engineers can assist with network topology review, driver installation guidance, and compatibility verification—please provide your PLC model numbers, software versions, and network configuration details.

Extended Capabilities & Integration Options

Multi-Drop Network Support
Connects to DH+ networks with up to 64 nodes, allowing access to multiple PLCs, HMIs, and other DH+ devices from a single USB connection. Supports node address configuration through RSLinx for seamless integration into existing network topologies.

Remote Diagnostics Enablement
When combined with VPN or remote desktop solutions, enables off-site engineering support and troubleshooting. Automation teams can remotely access plant floor controllers for diagnostics, program backups, and minor modifications without travel, reducing downtime and service costs.

Data Logging & Historian Integration
Compatible with OPC servers and data acquisition software for real-time data collection from DH+ networks. Supports integration with SCADA systems, MES platforms, and cloud-based analytics solutions for production monitoring and predictive maintenance applications.

Delivery, Service & Quality Assurance

Standard catalog items ship within 1-3 business days from our regional distribution centers. Custom cable assemblies or bulk orders typically require 5-10 business days. Each 1784-U2DHP converter includes a 12-month manufacturer warranty covering defects in materials and workmanship, with optional extended service plans available for critical applications.

Technical support includes remote installation assistance, driver configuration guidance, and troubleshooting support via phone and email during business hours. On-site commissioning and training services are available in select regions—contact our service team for availability and pricing. Complete documentation package includes quick start guide, USB driver installation instructions, DH+ wiring diagrams, and RSLinx configuration examples to streamline deployment and minimize setup time.

All units undergo factory testing and quality inspection prior to shipment, with test certificates available upon request for projects requiring documented traceability and compliance verification.

Frequently Asked Questions (FAQ)

Q: How does the 1784-U2DHP USB to Data Highway Plus converter connect to existing PLC networks?
A: The converter connects via an 8-pin mini-DIN connector to a standard DH+ network tap or T-connector. You'll need a DH+ cable (blue or purple trunk cable) with appropriate taps installed at each node location. The USB side connects directly to your laptop or PC. RSLinx software automatically detects the converter once drivers are installed, and you configure the DH+ driver with the correct baud rate matching your network (typically 57.6K, 115.2K, or 230.4K bps).

Q: What is the maximum number of PLCs this converter can communicate with simultaneously?
A: The 1784-U2DHP supports Data Highway Plus networks with up to 64 nodes. However, practical communication depends on network traffic, baud rate, and application requirements. For programming and monitoring applications, you can access any PLC on the network by specifying its node address in RSLinx or your programming software. Only one active programming session per PLC is recommended to avoid conflicts.

Q: What energy savings or efficiency improvements can be expected with this converter?
A: While the converter itself is a communication tool rather than an energy-saving device, it enables more efficient maintenance and optimization workflows. By providing portable, reliable access to legacy PLC systems, technicians can quickly adjust control parameters, optimize process setpoints, and implement energy-saving logic modifications that may reduce overall system energy consumption by 10-30% depending on the application. The USB-powered design also eliminates the need for AC adapters, reducing standby power consumption in mobile service kits.

Q: What are the installation environment requirements and protection rating?
A: The 1784-U2DHP is designed for indoor industrial environments with operating temperatures from 0°C to 60°C and humidity up to 95% non-condensing. The module itself is not rated for outdoor or hazardous location installation (no IP or NEMA rating). For field applications, the converter should be protected from direct water exposure, excessive dust, and mechanical impact. The 2500V optical isolation provides electrical protection between the USB and DH+ sides, safeguarding connected computers from ground potential differences and electrical noise common in industrial settings.

Q: Does this converter support remote monitoring and data acquisition protocols?
A: Yes, when used with appropriate software. The 1784-U2DHP functions as a standard DH+ interface recognized by RSLinx, which supports OPC DA (Data Access) and OPC HDA (Historical Data Access) server functionality. This allows third-party SCADA systems, historians, and MES platforms to read/write data from DH+ networks using industry-standard OPC protocols. For modern IIoT applications, the converter can be paired with edge gateways supporting protocol conversion from DH+ to MQTT, Modbus TCP, or other contemporary industrial protocols. Consult with our integration specialists for specific application architectures and recommended software components.

Q: Can I use multiple 1784-U2DHP converters on the same computer for different DH+ networks?
A: Yes, RSLinx Classic supports multiple DH+ drivers simultaneously. Each 1784-U2DHP converter connected to a different USB port can be configured as a separate DH+ driver instance in RSLinx, allowing access to multiple isolated DH+ networks from a single workstation. This is particularly useful for system integrators managing multiple customer sites or facilities with separate control networks. Ensure adequate USB bandwidth and system resources when operating multiple converters concurrently.

Request Technical Support & Custom Solutions

To receive detailed application engineering support, product selection guidance, or volume pricing quotations, please provide the following information to our technical sales team:

• Project name and application overview (industry, process type)
• Existing PLC models and firmware versions (e.g., PLC-5/40, SLC 5/05)
• Current DH+ network configuration (baud rate, number of nodes, cable type)
• Programming software versions (RSLogix 5, RSLogix 500, etc.)
• Operating system of programming workstations
• Quantity required and delivery timeline
• Any special requirements (extended temperature, custom cables, documentation needs)

Our application engineers will provide one-on-one consultation, compatibility verification, and tailored recommendations to ensure successful integration with your automation infrastructure.

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