Allen Bradley 1756-DHRIO D

Brand: Allen Bradley
Model: 1756-DHRIO D

Inventory situation: Goods are available in stock.

Product features

The Allen Bradley 1756-DHRIO/D is a dependable communication module created exclusively for the ControlLogix system, making it an excellent option for industrial data transfer and remote I/O connections. This module fits well into 1756 ControlLogix racks, occupying only one slot, freeing up space for other system components. It has an open housing design and weighs only 0.293 kilograms (0.64 pounds), which makes installation easy. The 1756-DHRIO/D supports two important industrial protocols: Data Highway Plus (DH+) and Remote I/O (RIO), which allow for seamless communication between devices in an industrial network. It includes two communication channels (Channel A and Channel B), each with three-pin terminals, as well as an 8-pin small DIN port connected in parallel with Channel A for more flexible connection possibilities.

The Allen Bradley 1756-DHRIO/D supports three different baud rates: 57.6 baud, 115.2 baud, and 230.4 baud. Each speed corresponds to a certain maximum cable length to enable stable data transmission-3048 meters at the lowest speed, 1524 meters at the medium speed, and 762 meters at the fastest speed. For best performance, it is compatible with Belden 89463 twinaxial cable (20AWG, 0.52 mm²), which can endure temperatures up to 200°C (392°F), excellent for tough industrial applications.

The 1756-DHRIO/D draws 1.7 mA at 5V and 850 mA at 24V from the backplane, has a maximum power consumption of 4.5 watts, and dissipates 15.4 British thermal units per hour. It functions efficiently in temperatures ranging from 0°C to 60°C (32°F to 140°F), making it suitable for most factory operating environments. This module also has a high level of connectivity, as it can handle up to 32 Logix connections while also acting as an adaptor and scanner to connect distant I/O devices, PLCs, SLCs, and other intelligent equipment. It can transmit data over up to three racks and four communication networks, making it ideal for large-scale industrial applications.

Specifications

Model	1756 - DHRIO/D
Module Type	Data Highway / Remote I/O Communication Module
Compatible Rack	1756 ControlLogix Rack
Slot Width	1 slot
Enclosure Type	Open-style enclosure
Communication Channels	2 channels (Channel A and Channel B)
Maximum Power Consumption	4.5 Watts
Weight	0.64 lbs

Precautions

First, always install the Allen Bradley 1756-DHRIO/D in a 1756 ControlLogix rack, occupying only one slot; never force it into incompatible racks or utilize multiple slots, since this can harm the module's backplane connector. The open housing design necessitates keeping the module in a clean, dust-free industrial environment to prevent debris from harming internal components.

For wiring, utilize Belden 89463 twinaxial cable (20AWG, 0.52 mm²) with the Allen Bradley 1756-DHRIO/D. Match the communication speed with the appropriate cable length: 3048 meters for 57.6 baud, 1524 meters for 115.2 baud, and 762 meters for 230.4 baud. Using non-recommended cables or neglecting length-speed matching will result in data loss or inconsistent communication. Ensure that the 3-pin terminals (Channel A and B) and the 8-pin mini DIN port (parallel to Channel A) are securely connected; loose wires can cause signal disruptions.

When configuring communication parameters, ensure that the Allen Bradley 1756-DHRIO/D's protocol (DH+ and RIO) is compatible with other network devices (such as PLCs, SLCs, and remote I/O units). To avoid overload, keep the number of Logix connections to a maximum of 32. Always synchronize the connection speeds of all connected devices; mismatched speeds will prevent data transfer.

FAQ

Q: What is the Allen Bradley 1756-DHRIO/D module, and what does it do?

A: The Allen Bradley 1756-DHRIO is a ControlLogix communication interface module that connects ControlLogix chassis to legacy Data Highway Plus (DH+) and Remote I/O (RIO) networks. It serves as a gateway, allowing current Logix5000 controllers to communicate with and control equipment on legacy Allen-Bradley networks. This is critical for plant upgrading and extending the life of previously installed equipment.

Q: What does the "rack addressing" limitation mean for Remote I/O?

A: When the 1756-DHRIO is utilized as a Remote I/O scanner, each of its two channels must be assigned a separate rack address. One important criterion is that both channels cannot scan the same rack address, even if the addresses are in distinct octal ranges. Under scanning mode, each channel can only communicate with one rack address at a time.

Q: Can I install or remove the 1756-DHRIO module while the chassis is powered (Hot Swap)?

A: Yes, the ControlLogix platform allows for module insertion and removal while the system is powered on, also known as hot swapping. However, it is critical to take all safety precautions. To avoid electrostatic discharge (ESD), make sure the area is safe and that you are properly grounded, as the module contains components that are sensitive to static electricity.