Description
Description
The Allen-Bradley 1756-DHRIO is a ControlLogix communication interface module designed to provide connectivity between ControlLogix controllers and Data Highway Plus (DH+) networks or Remote I/O (RIO) networks. This module functions as a bridge, allowing for seamless data exchange and device management across legacy and modern industrial communication architectures.
Features
- Dual-channel communication interface for versatile network integration.
- Supports Data Highway Plus (DH+) communication protocol.
- Functions as a Remote I/O (RIO) scanner for distributed control applications.
- Selectable communication speeds: 57.6 Kbaud, 115.2 Kbaud, and 230.4 Kbaud.
- Designed for seamless integration into the ControlLogix chassis backplane.
Applications
The 1756-DHRIO is typically utilized in industrial automation environments requiring the integration of legacy DH+ networks or RIO-based field devices into a modern ControlLogix platform. It is commonly found in manufacturing, process control, and material handling systems where legacy infrastructure must be maintained alongside newer control hardware.
Technical Specifications
| Module Type |
Communication Interface Module |
| Communication Channels |
2 |
| Communication Speeds |
57.6 Kbaud, 115.2 Kbaud, 230.4 Kbaud |
| Current Draw |
850 mA @ 24 VDC |
| Recommended Cable |
Belden 89463 twinaxial (0.52 mm2 / 20 AWG) |
| Max Cable Length |
Up to 3048 m (10,000 ft) depending on baud rate |
Installation Guidelines
- Ensure the ControlLogix chassis power is disconnected before installing or removing the module.
- Slide the module into the designated chassis slot and secure it using the top and bottom latching mechanisms.
- Use shielded twinaxial cable (e.g., Belden 89463) for all DH+ and RIO connections to minimize EMI interference.
- Maintain proper grounding practices for the communication shield to prevent noise-related communication errors.
- Verify that the baud rate settings on the module match the existing network configuration before commissioning.
FAQ
What is the primary function of the 1756-DHRIO module?
The module acts as a communication bridge, enabling a ControlLogix controller to communicate with devices on a Data Highway Plus network or to act as a scanner for Remote I/O networks.
Can this module be used for both DH+ and RIO networks?
Yes, the 1756-DHRIO is designed to support both DH+ and Remote I/O communication protocols, providing flexibility for legacy system integration.
