Allen-Bradley

Allen-Bradley 1785-LT PLC-5/10 Programmable Controller Processor

SKU 1785-LT

In stock
  • 12-month warranty
  • Free returns within 30 days
  • Manufacturer: Allen-Bradley

  • Product No.: 1785-LT

  • Country of origin:United States

  • Product Type: PLC Controller Processor

  • Payment: T/T, Western Union

  • Weight: 1150g

  • Dimensions: 25.4 x 17.8 x 6.4 cm

  • Shipping port: Xiamen

  • Warranty: 12 months

Overview

The Allen-Bradley 1785-LT is a PLC-5/10 processor for the 1771 chassis platform.

The recorded configuration includes DH+, Remote I/O and serial ports, 6 kilowords of SRAM, and support for up to four local racks.

Features

  • Central processing unit for Allen-Bradley PLC-5 control systems operating on standard 1771 backplanes
  • Supports multi-rack configurations up to four local racks including the resident chassis
  • 6 kilowords standard user memory in SRAM, expandable up to 14 kilowords
  • Integrated Data Highway Plus (DH+) communication port for programming, networking, and HMI connectivity
  • Built-in Remote I/O (RIO) channel capable of supporting distributed adapter racks and remote devices
  • Configurable RS-232-C / RS-422-A / RS-423-A serial port for peripheral connection, ASCII data transfer, or modem communication

Technical Specifications

Parameter Specification
Manufacturer Allen-Bradley / Rockwell Automation
Product Line PLC-5
Catalog Number 1785-LT
Processor Type Programmable Logic Controller (PLC) Processor
User Memory Size 6 kilowords SRAM (expandable to 14 kilowords)
Communication Ports 1 x Data Highway Plus (DH+), 1 x Remote I/O (RIO), 1 x Serial (RS-232-C/422-A/423-A)
Local Rack Capacity Up to 4 local racks (including resident rack)
Maximum Total I/O 3072 inputs and 3072 outputs (complementary) or 3072 any mix
Chassis Compatibility Allen-Bradley 1771 Universal I/O Chassis
Backplane Current Draw 2.5 A at 5 VDC
Operating Temperature 0 to 60 degC (32 to 140 degF)
Enclosure Type Open-style industrial module
Country of Origin United States

FAQ

What chassis types are compatible with the Allen-Bradley 1785-LT processor?

The 1785-LT processor is designed to install directly into Allen-Bradley 1771 universal I/O chassis backplanes, occupying a single module slot.

What communication protocols are natively supported by the 1785-LT?

The processor includes native support for Data Highway Plus (DH+) for peer-to-peer networking and programming, a Remote I/O (RIO) interface for distributed rack communication, and an RS-232-C/422-A/423-A serial port.

Can the user memory on the 1785-LT be upgraded?

Yes, the controller comes equipped with 6 kilowords of standard SRAM user memory, which is expandable up to 14 kilowords to accommodate larger ladder logic programs.

How many local racks can a single 1785-LT processor support?

The 1785-LT supports up to four local racks in total, including the resident rack where the processor module is physically installed.

View all FAQs →

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Returns & Warranty

  • 30-Day Guarantee: Returns accepted for in-stock products in original, factory-sealed packaging.
  • 12-Month Warranty: Every industrial component is backed by our technical warranty.
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Global Express Shipping

  • Standard Delivery: 4-6 Business Days via DHL, FedEx, and UPS.
  • Express Dispatch: Same-day dispatch for in-stock orders placed before 2:00 PM (GMT+8).
  • Worldwide Coverage: Serving over 150 countries, including rapid delivery to Saudi Arabia and UAE.

Returns & Warranty

  • 30-Day Guarantee: Returns accepted for in-stock products in original, factory-sealed packaging.
  • 12-Month Warranty: Every industrial component is backed by our professional technical warranty.

Orders are processed and delivered Monday-Friday (excluding public holidays).


For full eligibility, restocking fees, and international return details, please view our official Refund & Return Policy .

TECHNICAL SPECIFICATIONS

Country of origin
United States

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