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

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

The Allen-Bradley 1756-DH485 is a specialized communication interface bridge module designed for the ControlLogix automation platform. This single-slot module functions as a protocol gateway, enabling ControlLogix processors to interface directly...

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Availability: Low stock: 5 left

SKU: 1756-DH485
Vendor: Allen-Bradley
Category: Communication Module
Related Series:

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The Allen-Bradley 1756-DH485 is a specialized communication interface bridge module designed for the ControlLogix automation platform. This single-slot module functions as a protocol gateway, enabling ControlLogix processors to interface directly with legacy DH-485 (Data Highway 485) networks. It is an essential component for system migrations, allowing for the integration of legacy SLC 500, MicroLogix, or PanelView hardware into high-performance ControlLogix systems without requiring complete field rewiring.

Features

  • Dual-Channel Connectivity: Features two independent DB9 communication ports (Channel A and Channel B), allowing for flexible network configuration as either an initiator or a responding node.
  • Network Capacity: Supports up to 32 logical devices per network segment.
  • Galvanic Isolation: Integrated electrical isolation barriers protect internal backplane logic from ground-loop fluctuations and field surges.
  • Protocol Support: Utilizes standard token-passing protocol layers over RS-485 physical media.

Applications

This module is primarily used in industrial environments for phased equipment retrofits and system upgrades. It allows facilities to maintain communication with legacy DH-485 devices while transitioning to modern ControlLogix control architectures, effectively reducing implementation costs and minimizing system downtime.

Technical Specifications

Model 1756-DH485
Product Line ControlLogix
Module Type DH-485 Communication Bridge
Ports 2x DB9 D-shell (Channel A/B)
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
Isolation Voltage 30V continuous
Operating Temperature 0 to 60 deg C
Humidity 5 to 95 percent non-condensing

Installation Guidelines

  • Ensure the ControlLogix chassis is powered down before inserting or removing the module.
  • The module occupies a single slot in any standard 1756 ControlLogix chassis.
  • Use shielded communication cables for RS-485 connections to minimize EMI interference.
  • Ensure proper grounding of the chassis to a common earth ground to maintain signal integrity.
  • Handle the module using ESD-safe practices to prevent damage to sensitive electronic components.

FAQ

Can this module be used in any ControlLogix chassis?

Yes, the 1756-DH485 is compatible with standard 1756 chassis series, including 1756-A4, 1756-A7, 1756-A10, 1756-A13, and 1756-A17.

Does the module require external power?

No, the module is powered directly through the ControlLogix backplane; it does not require an external power supply for its own operation.