Allen-Bradley 1756-DHRIO ControlLogix Data Highway Plus/Remote I/O Module

Product Overview

The Allen-Bradley 1756-DHRIO functions as the primary gateway for integrating high-performance ControlLogix systems with legacy Data Highway Plus (DH+) and Universal Remote I/O (RIO) networks. This module facilitates bidirectional data exchange between modern Logix controllers and existing PLC-5 or SLC 500 architectures. It acts as a bridge, allowing for staged system migrations without requiring a complete overhaul of field wiring. We supply this unit in 100% Brand New and Original condition, ensuring your network backbone utilizes factory-certified hardware for mission-critical messaging.

Technical Specifications

Engineering Advantages

The 1756-DHRIO overcomes complex networking bottlenecks and migration hurdles through specialized communication engineering:

• Dual-Channel Versatility: The module features two independent channels, which users configure separately for DH+ or Remote I/O. This flexibility allows one module to manage a DH+ messaging network for peer-to-peer data while simultaneously controlling a rack of remote I/O devices.

• Legacy Infrastructure Preservation: It supports cable lengths up to 10,000 feet using Belden 89463 twinaxial media. This capability enables the modern ControlLogix platform to command distant field devices without the high cost of trenching new Ethernet fiber or copper.

• High-Speed Migration Path: By supporting 230.4 Kbaud, the 1756-DHRIO maximizes throughput for existing twinax networks. This reduces the latency typically associated with older serial-based protocols during high-speed process control.

• Advanced Diagnostic Visibility: Front-panel indicators provide real-time status for both channels and the module's internal health. This allows maintenance teams to identify network faults, duplicate node addresses, or cable breaks at a glance without opening a programming terminal.

• Industrial Hardening: The open-type enclosure design supports a wide operating temperature range (up to 60°C). The Phoenix MVSTBR2.5/3-ST BK AU connector ensures a secure, vibration-resistant electrical contact, preventing intermittent signal loss in high-resonance environments.

FAQs

• Does the 1756-DHRIO require specific configuration for DH+ vs. RIO?

  Yes. You must set the channel configuration through the software and hardware switches on the module. This defines whether the port operates as a DH+ peer or a Remote I/O scanner/adapter.

• How do I confirm the "Brand New" condition of this 1756-DHRIO?

  We guarantee every unit arrives in its original Allen-Bradley factory box with intact security seals. Every module carries a unique GTIN (10612598138361) and serial number for full manufacturer traceability, ensuring the unit has zero previous runtime.

• Can the 1756-DHRIO bridge messages between different networks?

  Absolutely. The module supports messaging from a DH+ network to another DH+ network, or from an Ethernet/IP network to a DH+ network through the ControlLogix backplane, making it an essential tool for plant-wide data integration.

• What is the recommended connector kit for this module?

  The module utilizes the Phoenix MVSTBR2.5/3-ST BK AU spare connector kit. This gold-plated interface provides superior conductivity and corrosion resistance, which is critical for maintaining signal integrity over long-distance twinaxial runs.