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Allen-Bradley 1785-L40B PLC-5/40 processor, 48K memory, DH+, Remote I/O, battery-backed

Allen-Bradley 1785-L40B

SKU: 1785 l40b
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$1,754.00
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Allen-Bradley 1785-L40B

Overview

The Allen-Bradley 1785-L40B is a PLC-5/40 processor module, part of the classic PLC-5 family used in a wide range of legacy industrial control systems. With 48K words of user memory, support for Remote I/O and Data Highway Plus (DH+), and a battery-backed RAM, this processor is well-suited for medium-to-large applications requiring robust logic control and network connectivity. It includes a mode keyswitch for secure operation.

Key Features

  • User Memory: 48K words

  • Communication:

    • Remote I/O

    • Data Highway Plus (DH+)

    • 57.6K baud default communication speed

  • Processor Type: PLC-5/40

  • Backplane Compatibility: Standard PLC-5 chassis

  • Memory Type: Battery-backed RAM

  • Keys: RUN, PROG, REM selectable via onboard keyswitch

  • Programming Software: RSLogix 5

  • Expansion: Supports I/O and communication expansion modules

Technical Specifications

  • Catalog Number: 1785-L40B

  • Platform: PLC-5

  • Power Supply: 5V DC via backplane

  • Memory Retention: Battery-backed (replaceable battery)

  • Mounting: PLC-5 chassis

  • Baud Rate: Configurable up to 57.6 kbps (DH+)

  • Operating Temperature: 0°C to 60°C

  • Certifications: UL, CSA, CE

  • Status Indicators: LED diagnostics for power, communication, and fault

Applications

  • Legacy system automation and upgrades

  • Water/wastewater treatment facilities

  • Automotive and assembly lines

  • Chemical and process control

  • Infrastructure and facility automation

Why Choose the 1785-L40B

  • Reliable for existing PLC-5 system maintenance and expansion

  • Dual communication options support complex topologies

  • Strong memory capacity for sophisticated control logic

  • Long-standing Allen-Bradley reputation for industrial reliability

Order Now

The Allen-Bradley 1785-L40B PLC-5/40 processor is available and ships worldwide. 

New & Genuine Products – Factory Sealed At PLCpartssolution, all our products are 100% new, genuine, and come in original factory-sealed packaging. We guarantee authentic components that meet the highest industry standards for performance and reliability.
1-Year Warranty Included All new products sold by PLCpartssolution come with a 1-year warranty. We stand behind the quality and reliability of our parts, ensuring coverage against manufacturing defects under normal operating conditions.
Disclaimer: PLCpartssolution is an independent supplier of surplus and refurbished industrial automation products. We are not an authorized distributor, reseller, or representative of the brands listed on this website. All trademarks, brand names, and logos are the property of their respective owners. PLCpartssolution is not affiliated with, endorsed by, or approved by ABB, Fanuc, B&R, Rockwell Automation, Schneider Electric, Siemens, or any other manufacturers mentioned.

Description

Allen-Bradley 1785-L40B

Overview

The Allen-Bradley 1785-L40B is a PLC-5/40 processor module, part of the classic PLC-5 family used in a wide range of legacy industrial control systems. With 48K words of user memory, support for Remote I/O and Data Highway Plus (DH+), and a battery-backed RAM, this processor is well-suited for medium-to-large applications requiring robust logic control and network connectivity. It includes a mode keyswitch for secure operation.

Key Features

  • User Memory: 48K words

  • Communication:

    • Remote I/O

    • Data Highway Plus (DH+)

    • 57.6K baud default communication speed

  • Processor Type: PLC-5/40

  • Backplane Compatibility: Standard PLC-5 chassis

  • Memory Type: Battery-backed RAM

  • Keys: RUN, PROG, REM selectable via onboard keyswitch

  • Programming Software: RSLogix 5

  • Expansion: Supports I/O and communication expansion modules

Technical Specifications

  • Catalog Number: 1785-L40B

  • Platform: PLC-5

  • Power Supply: 5V DC via backplane

  • Memory Retention: Battery-backed (replaceable battery)

  • Mounting: PLC-5 chassis

  • Baud Rate: Configurable up to 57.6 kbps (DH+)

  • Operating Temperature: 0°C to 60°C

  • Certifications: UL, CSA, CE

  • Status Indicators: LED diagnostics for power, communication, and fault

Applications

  • Legacy system automation and upgrades

  • Water/wastewater treatment facilities

  • Automotive and assembly lines

  • Chemical and process control

  • Infrastructure and facility automation

Why Choose the 1785-L40B

  • Reliable for existing PLC-5 system maintenance and expansion

  • Dual communication options support complex topologies

  • Strong memory capacity for sophisticated control logic

  • Long-standing Allen-Bradley reputation for industrial reliability

Order Now

The Allen-Bradley 1785-L40B PLC-5/40 processor is available and ships worldwide. 

Condition

New & Genuine Products – Factory Sealed At PLCpartssolution, all our products are 100% new, genuine, and come in original factory-sealed packaging. We guarantee authentic components that meet the highest industry standards for performance and reliability.

Warranty

1-Year Warranty Included All new products sold by PLCpartssolution come with a 1-year warranty. We stand behind the quality and reliability of our parts, ensuring coverage against manufacturing defects under normal operating conditions.

Disclaimer

Disclaimer: PLCpartssolution is an independent supplier of surplus and refurbished industrial automation products. We are not an authorized distributor, reseller, or representative of the brands listed on this website. All trademarks, brand names, and logos are the property of their respective owners. PLCpartssolution is not affiliated with, endorsed by, or approved by ABB, Fanuc, B&R, Rockwell Automation, Schneider Electric, Siemens, or any other manufacturers mentioned.
Allen-Bradley 1785-L40B

Allen-Bradley 1785-L40B

$1,754.00
Add to wishlist
Allen-Bradley 1785-L40B

Allen-Bradley 1785-L40B

Your Price:
$1,754.00
Item Added to Your Cart
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