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
$779.00
$779.00
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 

Allen Bradley PLC 5 Communication Adaptor Module, Data Highway, Data Highway Plus, and Allen-Bradley Industrial Terminal (Series 1784) Interface Ports, 1.4 Amperes at 5 Volts DC Required Backplane.

 

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 PLC 5 Data Highway/Data Highway Plus Communication Adapter Module by Allen Bradley is an adapter module which connects PLC 5 controllers on the Data Highway Plus network with redistribution points (nodes) on the Allen Bradley Data Highway. The 1785-KA is fitted on a single slot of the 1771 I/O chassis and requires a backplane current of 1.5 A at 5 Volts DC from the chassis supplied power source. It connects to the Data Highway through the 15-pin male EIA D-shell connector communication port on the side, and to the Data Highway Plus via the 3-screw terminal block using the Data Highway and Data Highway Plus connector cables. It can also connect to the 1784-T50 Terminal through the 9-pin male EIA D-shell connector.

This module has a communication speed of 57.6 kb on the Data Highway and the Data Highway Plus network.

The 1785-KA has 6 switch assemblies (SW1 through SW6), which provide selections between the various communication options; the SW1 switch allows for selection of the DDH+ and Data Highway communication rates. The SW 2 and 3 are designated “for future use”, and the switches SW4, SW5, and SW6 are used to set Redistribution points (node addresses) of the module on the Data Highway and Data Highway Plus Networks. The module has a keying position between pins 4 and 6 and between pins 24 and 26 of the slot rack. It has an ambient working temperature range between 0 to 60 degrees Celsius and is stored at a range of -40 to 85 degrees Celsius.


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.
QElectro 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 

Allen Bradley PLC 5 Communication Adaptor Module, Data Highway, Data Highway Plus, and Allen-Bradley Industrial Terminal (Series 1784) Interface Ports, 1.4 Amperes at 5 Volts DC Required Backplane.

 

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 PLC 5 Data Highway/Data Highway Plus Communication Adapter Module by Allen Bradley is an adapter module which connects PLC 5 controllers on the Data Highway Plus network with redistribution points (nodes) on the Allen Bradley Data Highway. The 1785-KA is fitted on a single slot of the 1771 I/O chassis and requires a backplane current of 1.5 A at 5 Volts DC from the chassis supplied power source. It connects to the Data Highway through the 15-pin male EIA D-shell connector communication port on the side, and to the Data Highway Plus via the 3-screw terminal block using the Data Highway and Data Highway Plus connector cables. It can also connect to the 1784-T50 Terminal through the 9-pin male EIA D-shell connector.

This module has a communication speed of 57.6 kb on the Data Highway and the Data Highway Plus network.

The 1785-KA has 6 switch assemblies (SW1 through SW6), which provide selections between the various communication options; the SW1 switch allows for selection of the DDH+ and Data Highway communication rates. The SW 2 and 3 are designated “for future use”, and the switches SW4, SW5, and SW6 are used to set Redistribution points (node addresses) of the module on the Data Highway and Data Highway Plus Networks. The module has a keying position between pins 4 and 6 and between pins 24 and 26 of the slot rack. It has an ambient working temperature range between 0 to 60 degrees Celsius and is stored at a range of -40 to 85 degrees Celsius.


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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