Product Details
Overview
The Allen-Bradley 1756-DH485 is a DH485 communication module for ControlLogix systems, engineered to integrate legacy DH485 devices into modern industrial automation networks. It provides reliable data exchange between ControlLogix controllers and connected devices, ensuring seamless connectivity in mixed-generation environments.
Technical Specifications
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Model / Part Number: 1756-DH485
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Brand: Allen-Bradley
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Product Type: Communication Module
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Communication Protocol: DH485 for deterministic data transfer
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Communication Speed: Up to 19.2 kbps
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Power Requirements: 5.1 VDC at 1.2 A (backplane powered)
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Operating Temperature: 0°C to +60°C (32°F to 140°F)
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Enclosure: Open-style module for chassis installation
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Compatibility: Works with ControlLogix controllers and legacy DH485 devices
Applications
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Integrating older DH485 devices into modern ControlLogix automation systems
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Enabling FactoryTalk and other Allen-Bradley software to communicate with DH485 networks
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Industrial systems requiring backward compatibility with legacy networks
FAQs
Q1: Can this module connect to non-ControlLogix DH485 devices?
Yes, it supports legacy DH485 devices for backward compatibility.
Q2: What is the maximum network speed?
The module supports communication speeds up to 19.2 kbps.
Q3: What temperature range is suitable for operation?
It operates safely between 0°C and 60°C (32°F to 140°F).
Additional Information
- 100% Genuine Parts: All products are original and authentic, ensuring reliable industrial performance.
- 30-Day Refund Guarantee: Return any in-stock item within 30 days in original, unopened packaging for a full refund (excluding shipping and fees).
- 12-Month Warranty: Covers defects in materials or workmanship; excludes misuse, normal wear, or unauthorized modifications.
- Worldwide Shipping: We ship via USPS, UPS, FedEx, and DHL. Delivery times vary by country and may be subject to customs or import fees.
- Support & Contact: Technical and warranty assistance is available anytime. Contact us here: Contact.
- Purchase Guidance: Check product specifications and compatibility carefully before ordering to ensure proper application.
Tech & Buying Guide
Understanding Safety Relays in Industrial Automation: Architecture, Operation, and Functional Safety
Standard electromechanical relays provide basic electrical isolation between low-voltage control circuits and high-power output loads. A traditional switching relay features a magnetic coil driving mechanical Common (COM), Normally-Open (NO), and Normally-Closed (NC) contacts. However, standard relays pose severe functional risks when deployed in critical safety interlock circuits. High current inrush or mechanical wear can weld contacts together permanently. If contact welding occurs in an emergency stop circuit, pressing the button fails to halt hazardous machinery movements. Consequently, global functional safety standards prohibit standard relays for critical machine guarding functions.
Mastering Wire Identification in Industrial Automation: The Power of Ferrules and Cross-Ferruling
Proper wire labeling forms the cornerstone of reliable control system installation and long-term maintenance. In complex industrial automation environments, technicians terminate thousands of conductor ends inside control panels, marshalling racks, and field junction boxes. Ferrules serve as individual tube-shaped sleeve markers slipped onto conductors before final termination. While technicians historically relied on pre-printed individual letter rings, modern control panel builders utilize automated ferrule printing machines. These thermal-transfer printers generate durable, single-sleeve heat-shrink tags directly matching approved wiring schematics, significantly accelerating cabinet assembly workflows.
Understanding Marshalling Cabinets in Industrial Automation and Control Systems
Marshalling cabinets serve as the crucial connection hub between field instruments and centralized processing units. In large DCS and PLC control system architectures, hundreds of multipair field cables run from local junction boxes to the central instrument equipment room. The marshalling cabinet houses field terminal blocks, surge arresters, intrinsic safety isolation barriers, and interposing relays. By segregating field field-wiring terminations from sensitive processor hardware, engineers protect expensive controller backplanes from high-voltage transients. Consequently, this modular separation dramatically streamlines maintenance workflows and simplifies system expansion.