Product Description
The Allen-Bradley 1785-KA5P is a panel-mounted DH+/DH-485 communication adapter module that enables communication between devices on a DH+ network (a baseband LAN supporting peer-to-peer communication with up to 64 uniquely addressed nodes) and devices on an RS-485 Data Highway Plus (DH+) network. Compatible with Allen-Bradley PLCs, it facilitates uploading/downloading SLC 500 programs via DH+ devices and allows message exchange between PLC and SLC processors. The module features a 3-pin phoenix connector for Data Highway Plus, a 9-Pin D-shell port, an 8-Pin modular connector port, a 6-Pin phoenix connector, and an external 5V DC power connector. It supports baud rates from 300 to 19,200, allows rate reservation, and offers remote programming capabilities. Rack-mountable and easily configurable, the 1785-KA5P communicates at 57,600 bits per second using a token passing process for reliable data transport, operates at 5V DC with 2 Amps of current, and functions in ambient temperatures from 0 to 60 degrees Celsius. It utilizes a DH/DH+ connector cable.
Is Your Device Showing These Signs?
The Allen Bradley 1785-KA5P PLC processor commonly experiences issues such as memory corruption, requiring memory module replacement or reprogramming. Backplane communication failures are frequent, often traced to faulty backplane connectors or the processor's communication interface. Power supply degradation leads to intermittent operation and requires power supply repair or replacement. Firmware corruption is a known issue that necessitates firmware reflashing or processor replacement. Finally, obsolescence leads to difficulty in sourcing replacement parts, prompting consideration of PLC migration or sourcing refurbished components.
Technical specifications
The Allen-Bradley 1785-KA5P is a communication adapter module that bridges DH+ and RS-485 DH+ networks, allowing Allen-Bradley PLCs and SLC 500 processors to communicate and exchange data. It supports various baud rates, remote programming, and is easily configured. It uses token passing for reliable communication at 57,600 bits per second, operates on 5V DC, and is designed for industrial environments.
Our Repair Process for the
1785-KA5P
Our repair process for the Allen Bradley 1785-KA5P PLC processor begins with a comprehensive diagnostic evaluation to pinpoint the failure. Memory corruption issues are resolved through memory module replacement or reprogramming. Backplane communication failures are addressed by repairing or replacing faulty backplane connectors or the processor's communication interface. Power supply degradation is rectified through power supply repair or replacement. Firmware corruption necessitates firmware reflashing or processor replacement. Obsolescence challenges are overcome by sourcing refurbished components or implementing a PLC migration strategy.
Your Guarantee: Warranty & Lifetime Support
Your satisfaction is our top priority, and we confidently stand behind the quality of our repairs. That's why every repair service is covered by our comprehensive 24-month warranty. Furthermore, we offer lifetime phone support – if you have questions or need assistance related to our repair down the road, we're here to help. Our service commitment is straightforward: we guarantee our work, and if you're not satisfied, we will make it right. Learn More about our Repair process.
Comprehensive Repairs You Can Depend On
We take immense pride in the quality and reliability of our work. Our process goes beyond simply fixing the immediate problem. We perform a comprehensive inspection of your main board (or other equipment) and proactively replace components known to be failure-prone or showing signs of potential future failure. Before any item is returned, it undergoes rigorous functional testing to ensure it meets performance specifications and operates flawlessly. Visit our main Repair Services page to learn more.
Save Significantly
Our primary goal is to save you hundreds, or even thousands, of dollars compared to the cost of new equipment replacement. By repairing existing components, we provide an economical solution that is also eco-friendly. At Roc Industrial, our commitment to integrity and community drives our consistent growth and ensures you receive a reliable, cost-effective solution.

Please Note: Roc Industrial operates as an independent service provider and is not an authorized distributor for the manufacturers or brands mentioned. Consequently, the original manufacturer's warranty is not applicable to items repaired or sold by us. Roc Industrial provides its own 2-year warranty on all repair services performed.

















