1756-DHRIO Allen‑Bradley communication module

Description

1756-DHRIO Allen‑Bradley communication module

Product Dimensions：

The Allen-Bradley 1756-DHRIO is a ControlLogix DH+/RIO Communication Module designed to provide a critical communication link between the ControlLogix platform and legacy Allen-Bradley systems, specifically those utilizing the Data Highway Plus (DH+) and Remote I/O (RIO) networks. It is a key component for modernizing control systems while retaining investments in existing I/O devices and controllers.

⚙️ Product Specifications (Product Parameters)

✨ Product Advantages (Product Advantages)

• Seamless Integration with Legacy Systems: The primary advantage is its ability to directly interface the high-speed ControlLogix backplane with older DH+ and RIO networks, eliminating the need for expensive or complex external gateways.

• Two Independent Ports: Features two ports that can be individually configured as either DH+ or RIO, offering flexibility in network architecture. For example, one port can be DH+ for communication with a PLC-5 or SLC 5/04, and the other can be RIO for controlling a rack of 1771 I/O.

• High Performance: Supports the highest available communication rates for DH+ (230.4 Kbaud) and RIO, ensuring reliable and fast data exchange.

• Simplified Migration: Facilitates phased migration projects where a legacy controller is upgraded to ControlLogix, but the existing DH+ network and RIO drops must remain active.

• ControlLogix Features: Leverages the ControlLogix backplane and processor for data management, providing advanced diagnostics and configuration tools through the development software (Studio 5000/RSLogix 5000).

⚠️ Important Considerations (Notes)

• Network Addressing: Careful attention must be paid to network addresses (Node Address for DH+, Group/Adapter Address for RIO) to avoid conflicts on the network.

• Configuration Software: Requires the use of Studio 5000 Logix Designer (or older RSLogix 5000) for configuration within the ControlLogix project.

• Cable Termination: Proper network termination is crucial for both DH+ and RIO networks to ensure signal integrity and prevent communication issues. Incorrect termination is a very common troubleshooting point.

• Power Requirements: Ensure the ControlLogix power supply can handle the current draw of all modules, including the 1756-DHRIO.

🛠️ Product Applications (Product Applications)

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

1. System Migration/Modernization: Allowing a new ControlLogix system to communicate with and control existing PLC-5 or SLC 5/04 controllers (via DH+) or legacy 1771 Remote I/O racks (via RIO) during a phased system upgrade.

2. Bridging/Routing: Acting as a bridge or router to pass data between the ControlLogix backplane and devices on the DH+ network, such as Human-Machine Interfaces (HMIs) or supervisory control systems.

3. Data Collection: Gathering data from multiple legacy PLC-5 or SLC 5/04 controllers connected on a DH+ network for central reporting and archival within the ControlLogix system.

4. Distributed Control: Utilizing the RIO port to drive large installations of older 1771 I/O modules, allowing a single ControlLogix processor to manage geographically dispersed I/O without an expensive I/O conversion.

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