Allen-Bradley 1756-DH485 ControlLogix DH-485 Bridge Module

Allen-Bradley 1756-DH485 ControlLogix DH-485 Communication Bridge Module

Availability: 3 left in stock

The Allen-Bradley 1756-DH485 is a dedicated communication bridge module designed for the ControlLogix platform, providing a reliable gateway between modern...

SKU: 1756-DH485

Manufacturer: Allen-Bradley
Product No.: 1756-DH485
Product Type: Communication Module
Product Origin: USA
Payment:T/T, Western Union
Weight: 260g
Shipping port: Xiamen
Warranty: 12 months

Description Reviews

The Allen-Bradley 1756-DH485 is a dedicated communication bridge module designed for the ControlLogix platform, providing a reliable gateway between modern control systems and legacy DH-485 networks. This module is an essential tool for system integrators tasked with migrating existing SLC 500, MicroLogix, or legacy PanelView architectures into a high-performance ControlLogix environment without requiring a complete overhaul of field wiring.

Features

Dual-Channel Interface: Features two independent DB9 serial ports (Channel A and Channel B) for versatile network connectivity.
Protocol Gateway: Facilitates seamless data exchange between ControlLogix processors and devices communicating via the DH-485 protocol.
Scalable Node Support: Supports up to 32 logical nodes per channel, allowing for robust expansion of legacy network segments.
Electrical Isolation: Integrated galvanic isolation between the DB9 ports and the backplane protects sensitive controller components from electrical surges and ground loop interference.
Compact Footprint: Occupies a single slot in any standard 1756 ControlLogix chassis.

Technical Specifications

Model	1756-DH485
Brand	Allen-Bradley
Product Line	ControlLogix
Module Type	DH-485 Communication Bridge
Communication Ports	2 x DB9 (Channel A/B)
Supported Baud Rates	9.6 kbps, 19.2 kbps
Backplane Current (5.1V)	850 mA
Backplane Current (24V)	1.7 mA
Power Dissipation	4.5 Watts
Operating Temperature	0 to 60 degC
Relative Humidity	5 to 95 percent (non-condensing)

Installation Guidelines

Ensure the ControlLogix chassis is powered down before inserting or removing the module to prevent damage to the backplane or module circuitry.
Slide the module into any available slot in the 1756 chassis and secure the top and bottom latching mechanisms.
Use shielded communication cables for all RS-485 connections to minimize electromagnetic interference (EMI).
Maintain proper ventilation in the control cabinet to ensure ambient temperatures remain within the 0 to 60 degC operating range.
Follow standard ESD (electrostatic discharge) prevention practices when handling the module to protect internal logic components.

FAQ

Can this module be used to bridge two different DH-485 networks?
Yes, the dual-channel configuration allows for independent network management, enabling the module to act as a bridge or gateway for multiple network segments.

Does this module require external power?
No, the 1756-DH485 draws all necessary operating power directly from the ControlLogix chassis backplane.

What's clients say about us

Excellent Emergency Support!

Our production line was down due to a faulty Bently Nevada monitor. We found it in stock here and they shipped it via DHL immediately. Back in operation within 48 hours—truly a lifesaver for our plant.

Mark Thompson

Maintenance Manager, USA

Reliable Source for New Spares

Finding brand new, original modules is critical for our safety. This team delivers factory-fresh components with full certification. Their commitment to only selling new products makes them our most trusted partner.

Robert Hoffmann

Engineering Lead, Germany

Top-tier Service and Quality

We have sourced Honeywell and Schneider parts here for two years. Every shipment arrives well-packaged with original factory seals intact. Clear communication and the best lead times in the industry.