AB 1756-DHRIO ControlLogix DH+/RIO Communication Module

Allen-Bradley 1756-DHRIO ControlLogix DH+/RIO Communication Module Overview

The Allen-Bradley 1756-DHRIO is a communication interface module for the ControlLogix platform, designed to provide connectivity to Data Highway Plus (DH+) and Remote I/O (RIO) networks. These legacy networks were widely used for connecting PLCs (Programmable Logic Controllers), HMIs (Human-Machine Interfaces), and I/O devices. The 1756-DHRIO acts as a bridge, allowing modern ControlLogix systems to integrate with and migrate from older Rockwell Automation control systems.

Product Detailed Description

• Functionality:

• DH+ Communication: Allows the ControlLogix processor to communicate with devices on a DH+ network. This includes older PLC-5 and SLC 5/04 processors, PanelView HMIs, and other DH+ enabled devices. It can act as a master or slave on the DH+ network.

• Remote I/O (RIO) Communication: Enables the ControlLogix processor to control and monitor I/O modules on a RIO network. This is crucial for integrating with existing I/O racks (like 1771 I/O, 1794 Flex I/O, 1746 I/O) that are connected via RIO adapters. It typically operates as a RIO scanner (master) controlling RIO adapters.

• Migration Path: The 1756-DHRIO is a key component for customers migrating from older PLC-5 or SLC systems to the ControlLogix platform, allowing them to reuse existing DH+ or RIO devices and infrastructure.

• Data Exchange: Facilitates the exchange of data (e.g., process variables, control commands, status information) between the ControlLogix processor and connected DH+ or RIO devices.

• Key Features:

• Dual-Port Design: Typically features two independent DH+/RIO ports, allowing for connection to two separate networks or for redundancy configurations.

• ControlLogix Backplane Integration: Plugs directly into a ControlLogix chassis, leveraging the high-speed backplane for efficient data transfer to and from the ControlLogix processor.

• Configurability: Configured using Rockwell Software's RSLogix 5000 (now Studio 5000 Logix Designer) software, allowing for flexible setup of network parameters, data mapping, and diagnostics.

• Diagnostic Indicators: LEDs on the module provide status and fault indications for network activity and module health, aiding in troubleshooting.

• Peer-to-Peer Messaging: Supports peer-to-peer messaging between DH+ devices.

Product Parameters

(Note: Specific parameters can vary slightly based on the module's series/firmware. Always refer to the official Rockwell Automation literature, such as the 1756-DHRIO User Manual, for precise specifications.)

• Module Type: ControlLogix Communication Module

• Network Compatibility: Data Highway Plus (DH+), Remote I/O (RIO)

• Number of Ports: 2 (typically)

• DH+ Data Rate: Configurable (e.g., 57.6 kbps, 115.2 kbps, 230.4 kbps)

• RIO Data Rate: Configurable (e.g., 57.6 kbps, 115.2 kbps, 230.4 kbps)

• DH+ Nodes: Supports a specific number of nodes per port (refer to manual for exact limits).

• RIO Racks/Words: Supports a specific number of RIO racks and input/output words (refer to manual for exact limits).

• Current Draw (Backplane): Typically 800 mA at 5.1V DC and 4 mA at 24V DC (these values are indicative and depend on the series).

• Operating Temperature: 0 to 60 °C (32 to 140 °F)

• Storage Temperature: -40 to 85 °C (-40 to 185 °F)

• Relative Humidity: 5% to 95% non-condensing

• Isolation Voltage: 250V (continuous)

• Certifications: UL Listed, CSA Certified, CE marked, C-Tick, KCC (specific to region and series).

Product Advantages

• Legacy System Integration: Provides a vital link for integrating newer ControlLogix systems with existing, operational DH+ and RIO networks and devices, saving significant upgrade costs.

• Cost-Effective Migration: Allows for phased migration strategies, where older I/O and PLC assets can continue to operate while the central control system is upgraded to ControlLogix.

• Increased Flexibility: Offers the ability to manage and control diverse legacy Rockwell Automation hardware from a modern ControlLogix processor.

• Dual-Port Capability: Two independent ports increase network capacity or allow for redundant network connections for enhanced reliability.

• Familiarity: Leverages well-understood and established DH+ and RIO communication protocols.

• Robustness: Designed for industrial environments, ensuring reliable communication performance.

Precautions

• Network Loading: Be mindful of the maximum number of nodes/racks and the data rate limitations for both DH+ and RIO networks to ensure stable communication. Overloading the network can lead to communication errors.

• Cable Type and Length: Use appropriate DH+ and RIO cabling (e.g., Belden 9463 or equivalent) and adhere to specified maximum cable lengths to maintain signal integrity.

• Termination: Proper network termination is critical for DH+ and RIO networks. Ensure correct termination resistors are installed at the ends of each network segment.

• Addressing: Ensure unique and correct network addresses are assigned to all devices on the DH+ and RIO networks to avoid conflicts.

• Grounding: Proper grounding of the communication module and network cabling is essential to minimize noise and ensure reliable operation.

• Firmware Compatibility: Ensure the module's firmware version is compatible with the ControlLogix processor and the version of Studio 5000 Logix Designer being used.

• Environmental Conditions: Install the module within its specified operating temperature and humidity ranges.

• Replacement Strategy: As DH+ and RIO are older technologies, consider a long-term strategy for eventually migrating all devices to modern Ethernet/IP networks to ensure future support and scalability.

Product Applications

The Allen-Bradley 1756-DHRIO module is primarily used in industrial automation environments for:

• Migration Projects: Facilitating the upgrade of control systems from PLC-5 or SLC platforms to ControlLogix, allowing continued use of existing DH+ PLCs and RIO I/O.

• Legacy System Integration: Connecting new ControlLogix systems with existing operational DH+ and RIO networks in large industrial plants.

• Process Control: In industries like oil & gas, chemicals, manufacturing, and power generation, where legacy equipment on DH+ or RIO needs to be integrated into a modern control architecture.

• Distributed I/O Systems: Controlling remote I/O racks that utilize RIO communication for cost-effective distributed control.

• Factory Automation: Linking various machines and control devices that still communicate over DH+ or RIO.

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