1785-KA | Allen-Bradley DH/DH+ Communication Adapter Module, Series A
1785-KA | Allen-Bradley DH/DH+ Communication Adapter Module, Series A
1785-KA | Allen-Bradley DH/DH+ Communication Adapter Module, Series A
1785-KA | Allen-Bradley DH/DH+ Communication Adapter Module, Series A
1785-KA | Allen-Bradley DH/DH+ Communication Adapter Module, Series A
1785-KA | Allen-Bradley DH/DH+ Communication Adapter Module, Series A
1785-KA | Allen-Bradley DH/DH+ Communication Adapter Module, Series A
1785-KA | Allen-Bradley DH/DH+ Communication Adapter Module, Series A
1785-KA | Allen-Bradley DH/DH+ Communication Adapter Module, Series A
    1785-KA | Allen-Bradley DH/DH+ Communication Adapter Module, Series A
    1785-KA | Allen-Bradley DH/DH+ Communication Adapter Module, Series A
    1785-KA | Allen-Bradley DH/DH+ Communication Adapter Module, Series A
1785-KA | Allen-Bradley DH/DH+ Communication Adapter Module, Series A
1785-KA | Allen-Bradley DH/DH+ Communication Adapter Module, Series A
1785-KA | Allen-Bradley DH/DH+ Communication Adapter Module, Series A

1785-KA | Allen-Bradley DH/DH+ Communication Adapter Module, Series A

Part #: 1785-KA Manufactured by: Allen-Bradley
$549.00
$549.00
4 in Stock
Condition: New-Surplus Original Box
Shipping calculated at checkout.
Product Overview
Allen-Bradley 1785-KA DH/DH+ Communication Adapter Module/Data Highway-to-Data Highway Plus Interface Module, 1 x DH Inter...  Read more
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Product Description P/N: 1785-KA

Description / Specifications

Description 

The Allen-Bradley 1785-KA is a PLC-5 communication adapter module designed to interface Data Highway Plus (DH+) networks with Allen-Bradley’s Data Highway. It enables PLC-5 controllers to exchange data with redistribution points and industrial terminals across networked systems. Installed in a single slot of the 1771 I/O chassis, this module was widely used in legacy control architectures requiring reliable plant-wide communication.

 

 

Technical Specifications 

Brand Allen-Bradley
Manufacturer Rockwell Automation
Part Number 1785-KA
Module Type Communication Adaptor Module
Required Backplane 1.4 Amperes at 5 Volts DC
Interface Ports Ports Data Highway, Data Highway Plus, and Allen-Bradley Industrial Terminal (Series 1784)
Operation Process Messages
Communication w/ PLC Processor Direct Connection to Channel 3 of PLC-5 Processor
LEDs 1 Diagnosis/Status Per Channel
Max Modules Per System 4
Coating Conformal Coat
Required External Power None
Typical AC Signal Delay (Off) 29 (+/- 8) ms
Typical DC Signal Delay (Off) 30 (+/- 7) ms
Wiring Arm 1771-WN
Dimensions 4.5 x 12.4 x 6.3 in (115 x 317 x 160 mm)
Series A

  

 

Information About 1785-KA

The 1785-KA belongs to the Allen-Bradley 1785-K series of communication modules, developed to provide flexible connectivity for PLC-5 systems. It features dual network support, allowing integration between Data Highway and Data Highway Plus networks at a communication speed of 57.6 kbps. The module provides multiple ports, including a 15-pin EIA D-shell connector for Data Highway, a 3-screw terminal block for DH+, and a 9-pin EIA D-shell port for connecting industrial terminals such as the 1784-T50. Configuration is achieved through six DIP switch assemblies, enabling adjustments of communication rate, mode selection, and node addressing. The unit draws 1.5 A from the backplane at 5 VDC and operates in an ambient range of 0–60 °C. With diagnostic indicators, robust construction, and integration flexibility, the 1785-KA played a key role in legacy Allen-Bradley PLC-5 networking.

Key Features:

  • Series: Part of the Allen-Bradley 1785-K communication adapter family.
  • Function: Interfaces Data Highway Plus (DH+) with Data Highway networks.
  • Compatibility: Designed for PLC-5 controllers and 1771 I/O chassis.
  • Communication Rate: Operates at 57.6 kbps.
  • Ports: Includes 15-pin Data Highway, 3-screw DH+ terminal, and 9-pin industrial terminal connections.
  • Configuration: Six DIP switch assemblies for speed, mode, and address selection.
  • Backplane Power: Requires 1.5 A at 5 VDC.
  • Diagnostics: Equipped with front-panel status LEDs for monitoring.
  • Environment: Operates from 0–60 °C, storage -40 to 85 °C.
  • Status: Discontinued by manufacturer, used in legacy PLC-5 networking systems.

The 1785-KA delivers dependable communication bridging for legacy Allen-Bradley PLC-5 Data Highway and Data Highway Plus networks.

 

Manufacturer information

Allen-Bradley, a brand of Rockwell Automation, specializes in manufacturing industrial automation equipment. The product range includes programmable logic controllers (PLCs), motion control systems, safety devices, motor control equipment, automation software, and HMI panels. Allen-Bradley products are known for their reliability and integration with other systems.

Frequently Asked Questions about 1785-KA
Question: What is the Allen-Bradley 1785-KA used for?
Date Update:27/05/2025
Answer:

The 1785-KA is a communication adapter module designed to connect PLC-5 processors to Data Highway and Data Highway Plus (DH/DH+) networks. It also supports communication with Allen-Bradley industrial terminals (such as 1784 series). This module enables data exchange between controllers and remote devices over these industrial communication networks. It plays a key role in distributed control and supervisory systems.

Question: How does the 1785-KA communicate with PLC processors?
Date Update:27/05/2025
Answer:

The module communicates directly with Channel 3 of a PLC-5 processor through the backplane. This connection allows the PLC to send and receive data from other network devices. It simplifies communication setup without the need for additional interface hardware. The direct backplane access ensures fast and efficient data transfer.

Question: What types of connections are available on the 1785-KA module?
Date Update:27/05/2025
Answer:

The module provides a 15-pin male EIA D-shell connector for Data Highway, a 3-screw terminal for Data Highway Plus, and a 9-pin connector for industrial terminal communication. These ports allow the module to serve as a bridge between various network components. It enables flexible integration with terminals, controllers, and operator interfaces. Each port is designed for secure and reliable connection in demanding environments.

Question: What is the typical data rate supported by the 1785-KA?
Date Update:27/05/2025
Answer:

The 1785-KA supports communication speeds up to 57.6 Kbps on both the Data Highway and Data Highway Plus networks. This rate is sufficient for reliable data exchange in supervisory and control systems. It balances communication speed with network stability and signal integrity. The module is optimized for peer-to-peer messaging performance.

Question: Is the 1785-KA still being manufactured?
Date Update:27/05/2025
Answer:

No, the 1785-KA has been discontinued and is considered an earlier model. While still used in legacy systems, it is no longer in active production by Rockwell Automation. Users should check availability through third-party suppliers or consider migration to modern equivalents. Support and documentation may still be accessible for existing installations.

IQElectro is not an authorized distributor.
IQElectro LLC (IQElectro) is NOT an Authorized Distributor or in any way affiliated with Rockwell Automation, Siemens, or any other Manufacturers. IQElectro is NOT an Authorized Dealer of this product. The product may be of older version, date codes, or design than that available from authorized dealers. As IQElectro is not an authorized dealer of this product, the Original Manufacturer's Warranty and Support DO NOT apply. IQElectro sells SURPLUS only and DOES NOT SELL SOFTWARE or FIRMWARE licenses For more detailed information, please refer to the full version of our disclaimer policy Disclaimer Policy.
Description / Specifications

Description 

The Allen-Bradley 1785-KA is a PLC-5 communication adapter module designed to interface Data Highway Plus (DH+) networks with Allen-Bradley’s Data Highway. It enables PLC-5 controllers to exchange data with redistribution points and industrial terminals across networked systems. Installed in a single slot of the 1771 I/O chassis, this module was widely used in legacy control architectures requiring reliable plant-wide communication.

 

 

Technical Specifications 

Brand Allen-Bradley
Manufacturer Rockwell Automation
Part Number 1785-KA
Module Type Communication Adaptor Module
Required Backplane 1.4 Amperes at 5 Volts DC
Interface Ports Ports Data Highway, Data Highway Plus, and Allen-Bradley Industrial Terminal (Series 1784)
Operation Process Messages
Communication w/ PLC Processor Direct Connection to Channel 3 of PLC-5 Processor
LEDs 1 Diagnosis/Status Per Channel
Max Modules Per System 4
Coating Conformal Coat
Required External Power None
Typical AC Signal Delay (Off) 29 (+/- 8) ms
Typical DC Signal Delay (Off) 30 (+/- 7) ms
Wiring Arm 1771-WN
Dimensions 4.5 x 12.4 x 6.3 in (115 x 317 x 160 mm)
Series A

  

 

Information About 1785-KA

The 1785-KA belongs to the Allen-Bradley 1785-K series of communication modules, developed to provide flexible connectivity for PLC-5 systems. It features dual network support, allowing integration between Data Highway and Data Highway Plus networks at a communication speed of 57.6 kbps. The module provides multiple ports, including a 15-pin EIA D-shell connector for Data Highway, a 3-screw terminal block for DH+, and a 9-pin EIA D-shell port for connecting industrial terminals such as the 1784-T50. Configuration is achieved through six DIP switch assemblies, enabling adjustments of communication rate, mode selection, and node addressing. The unit draws 1.5 A from the backplane at 5 VDC and operates in an ambient range of 0–60 °C. With diagnostic indicators, robust construction, and integration flexibility, the 1785-KA played a key role in legacy Allen-Bradley PLC-5 networking.

Key Features:

  • Series: Part of the Allen-Bradley 1785-K communication adapter family.
  • Function: Interfaces Data Highway Plus (DH+) with Data Highway networks.
  • Compatibility: Designed for PLC-5 controllers and 1771 I/O chassis.
  • Communication Rate: Operates at 57.6 kbps.
  • Ports: Includes 15-pin Data Highway, 3-screw DH+ terminal, and 9-pin industrial terminal connections.
  • Configuration: Six DIP switch assemblies for speed, mode, and address selection.
  • Backplane Power: Requires 1.5 A at 5 VDC.
  • Diagnostics: Equipped with front-panel status LEDs for monitoring.
  • Environment: Operates from 0–60 °C, storage -40 to 85 °C.
  • Status: Discontinued by manufacturer, used in legacy PLC-5 networking systems.

The 1785-KA delivers dependable communication bridging for legacy Allen-Bradley PLC-5 Data Highway and Data Highway Plus networks.

 

Manufacturer information

Allen-Bradley, a brand of Rockwell Automation, specializes in manufacturing industrial automation equipment. The product range includes programmable logic controllers (PLCs), motion control systems, safety devices, motor control equipment, automation software, and HMI panels. Allen-Bradley products are known for their reliability and integration with other systems.

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