1756-DHRIO Allen-Bradley

1756-DHRIO Allen-Bradley I / O module

Product  Description：

The Allen-Bradley 1756-DHRIO is a single-slot communication module designed for the ControlLogix platform. Its core purpose is to provide connectivity between the modern ControlLogix system and legacy or older Allen-Bradley control networks, specifically Data Highway Plus (DH+) and Remote I/O (RIO). This allows a ControlLogix processor to act as a bridge, master, or scanner to communicate with older devices like PLC-5 and SLC 5/04 controllers (via DH+) or to manage existing Remote I/O racks and devices such as drives and distributed I/O modules.

Product Specifications

• Platform: ControlLogix Series

• Slot: Single-slot module for the 1756 chassis

• Communication Networks Supported: Data Highway Plus (DH+) and Remote I/O (RIO)

• Ports: Two independent ports, software-configurable for either DH+ or RIO communication

• DH+ Communication Speeds: Configurable for $57.6 \text{ Kbaud}$, $115.2 \text{ Kbaud}$, and $230.4 \text{ Kbaud}$

• Maximum Cable Length: Supports up to $3048 \text{ m (10,000 ft)}$ at the lowest speed ($57.6 \text{ Kbaud}$), using the recommended cable

• Recommended Cable: Belden 89463 twinaxial cable ($0.52 \text{ mm}^2$ or $20 \text{ AWG}$)

• Backplane Current Draw: Typically $1.7 \text{ mA}$ at $5 \text{ VDC}$ and $850 \text{ mA}$ at $24 \text{ VDC}$

• Power Dissipation: Maximum $4.5 \text{ W}$

• Thermal Dissipation: Maximum $15.4 \text{ BTU/hr}$

• Operating Temperature: $0 \text{ to } 60^\circ \text{C } (32 \text{ to } 140^\circ \text{F})$

Product Advantages

• Legacy System Integration: The primary advantage is its ability to seamlessly integrate legacy DH+ and RIO networks into the modern ControlLogix architecture, preserving significant investment in older Allen-Bradley equipment.

• Gateway Functionality: It allows the ControlLogix system to act as a gateway, enabling data transfer and control between the high-speed ControlLogix backplane and the slower DH+/RIO networks.

• Versatile Connectivity: The two independent ports can be configured for any combination of DH+ or RIO, offering flexibility to connect to multiple legacy networks simultaneously from a single module.

• ControlLogix Benefits: By bringing legacy I/O under ControlLogix control, users gain the benefits of the ControlLogix platform, including advanced programming features, superior data handling, and better integration with factory-wide information systems.

• Multi-Speed Support: The module's support for multiple communication speeds on DH+ allows it to adapt to various existing network configurations.

Important Considerations (Precautions)

• Obsolescence: The 1756-DHRIO is an older product. While it may still be available and supported, users should be aware of its lifecycle status and consider migration strategies to modern EtherNet/IP-based solutions (like $1756-\text{EN}\star \star$ modules) and devices where possible.

• Wiring Practices: Always use the recommended twinaxial cable (e.g., Belden 89463) and ensure proper network termination with resistors to prevent communication issues and noise. Incorrect cable type or improper termination can lead to intermittent faults.

• Power Down Before Installation: As with all chassis-mounted modules, all power sources to the ControlLogix chassis must be disconnected before installation or removal to prevent electric shock and potential equipment damage.

• Hazardous Environments: If the equipment is used in a manner not specified by the manufacturer, the protection provided by the equipment may be impaired. Follow all warnings and safety instructions regarding hazardous environments (e.g., Class I, Division 2).

• Configuration Complexity: Setting up the DH+ and RIO networks, including node addressing and I/O mapping, requires specialized knowledge and careful configuration within the ControlLogix programming software.

Product Applications

The 1756-DHRIO module is primarily used in industrial environments that require modernization of their control systems while maintaining operation of reliable, existing field equipment.

• Legacy Modernization Projects: Acting as a bridge to allow a new ControlLogix PAC to communicate with and eventually take over control from older DH+-based controllers (like PLC-5 or SLC 5/04).

• Remote I/O Consolidation: Bringing legacy RIO chassis, including $1771$ I/O and specific drives (e.g., PowerFlex 700 with RIO adapters), under the control of a ControlLogix processor.

• Gateway for HMI/SCADA: Allowing Supervisory Control and Data Acquisition (SCADA) systems connected to the ControlLogix backplane to access data from devices on the DH+ network.

• Distributed Control: Maintaining existing distributed I/O infrastructure on RIO or DH+ while upgrading the main controller in a phased approach.

The structure and details of the product：

Our services：

Shipping Port:  China

Payment: Bank of Chicago, Bank of Singapore

Express cooperation: fedex, DHL, UPS and your express account

Service: Professional Sales provides 24 hours /7 days online service

Warranty: one year

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