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Allen-Bradley 1785-L40B PLC-5/40 Processor

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Allen-Bradley 1785-L40B

by Allen-Bradley

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OverviewUnlock unparalleled command and dependability with the Allen-Bradley PLC-5/40 1785-L40B Processor. This robust unit is crafted for challenging industrial settings, offering superior performance and vast capabilities for expansive control applications. Featuring extensive memory, a high I/O capacity, and adaptable communication choices, the 1785-L40B stands as the premier solution for intricate automation tasks, guaranteeing smooth operation and peak efficiency in vital industrial procedures. As a component of the well-regarded PLC-5 series, this model delivers the reliability and advanced features synonymous with Allen-Bradley, making it a cornerstone for sophisticated control systems.Key Features Generous 48K Word SRAM: Provides substantial memory, enabling the execution of complex control programs and storage of significant operational data with ease. Extensive 2048 Total I/O: Supports a wide array of discrete and analog input/output points, facilitating precise and broad control over numerous system components. Dedicated 2048 Analog I/O Capacity: Specifically designed to manage a large number of analog signals, ensuring precise data acquisition and control in applications requiring fine adjustments. Four DH+/Remote I/O Channels: Offers flexible communication pathways for distributed control architectures, allowing seamless integration and connectivity with other devices and networks, configurable as Adapters or Scanners. Battery-Backed Static RAM: Ensures the preservation of critical program logic and data, even during unexpected power disruptions, maintaining continuous operational integrity. EEPROM Program Backup Option: Enhances data security and simplifies program management through compatibility with 1785-ME16, -ME32, -ME64, and -M100 EEPROM modules, providing a dependable backup solution. Configurable Serial Port (RS-232-C/422-A/423-A): Delivers flexible communication possibilities for connecting to a diverse range of serial devices, improving system adaptability and connectivity. Technical SpecificationsManufacturer: Allen-Bradley (Rockwell Automation)Series: PLC-5Model: 1785-L40BMemory: 48K Word SRAMTotal I/O: 2048 (Any Mix) or 2048 In + 2048 Out (Complementary)Analog I/O: 2048Communication Channels: 4 DH+/Remote I/O (Adapter or Scanner)I/O Scan Time (per rack): 10 ms @ 57.6 kbit/s, 7 ms @ 115.2 kbit/s, 3 ms @ 230.4 kbit/sMax I/O Chassis: 61Serial Port: RS-232-C/422-A/423-A ConfigurableBackplane Current Load: 3.3 A @ 5VApplicationsThe Allen-Bradley PLC-5/40 1785-L40B Processor is specifically designed to excel in a wide array of large and complex industrial applications, including: Large-Scale Manufacturing Plants: Optimizes control over extensive production lines, assembly processes, and automated machinery, ensuring high throughput and consistent quality. Complex Process Control Systems: Ideal for managing intricate chemical, pharmaceutical, and food processing operations, where precise control of parameters like temperature, pressure, and flow is critical. Water and Wastewater Treatment Facilities: Provides robust control for comprehensive operations, including pumping stations, purification processes, and distribution networks, ensuring efficient and reliable service. Power Generation and Distribution: Facilitates the efficient monitoring and control of power plants, substations, and energy distribution networks, ensuring stable and reliable power supply. Oil & Gas Exploration and Processing: Manages complex drilling, extraction, and refining processes, providing critical control in hazardous and demanding environments. Mining Operations: Controls heavy machinery, conveyors, and processing equipment in mining facilities, enhancing safety and operational efficiency. Why Choose This Model?This processor offers exceptional performance for demanding tasks. It is built to consistently handle the most intensive industrial applications, delivering extraordinary processing capabilities and an abundance of memory.Order NowReady to enhance your industrial automation? Contact Palm Parts Solution today to inquire about the Allen-Bradley 1785-L40B Processor and discover how this powerful controller can optimize your operations.FAQWhat is the memory capacity of the 1785-L40B processor?The 1785-L40B features a generous 48K Word SRAM, providing ample space for complex control programs and extensive operational data storage.How many I/O points does this controller support?It supports an expansive 2048 total I/O points, allowing for versatile control over a multitude of system components.What communication options are available?The processor includes four DH+/Remote I/O channels, which can be configured as Adapters or Scanners, and a configurable serial port (RS-232-C/422-A/423-A) for flexible connectivity.Is data preserved during power outages?Yes, the 1785-L40B features Battery-Backed Static RAM to ensure the preservation of critical program logic and data, even in the event of unexpected power interruptions.What types of applications is this processor suitable for?It is ideal for a diverse range of large and complex industrial applications, including large-scale manufacturing, complex process control systems, water/wastewater treatment, power generation, oil & gas, and mining operations.

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PRODUCT DETAILS

Allen-Bradley 1785-L40B

Overview

This is a genuine Allen-Bradley component. PalmPartsSolution stocks it in new, refurbished, and surplus condition with tested warranty and same-day shipping on in-stock units.

Whether you are sourcing a like-for-like replacement for an existing installation, an emergency spare to keep a line running, or a qualified part for a new build, our team can confirm availability, revision, and lead time before you order.

Key Features

  • Genuine Allen-Bradley catalog part
  • Tested before shipment
  • Backed by PalmPartsSolution warranty
  • Cross-reference and revision assistance available
  • Compatible with the broader Allen-Bradley automation ecosystem

Compatibility

When ordering, match the full catalog/part number, hardware revision, and firmware revision called out by your Allen-Bradley equipment. Where applicable, confirm:

  • Input/output voltage and current rating
  • Communication protocol and network role
  • Mounting form factor and footprint
  • Operating temperature, humidity, and IP rating
  • Required certifications (UL, CE, ATEX, marine, etc.)

Not sure which revision you need? Send us the catalog number on the nameplate and we will confirm the correct match.

Replacement Information

Three ways to source this part through PalmPartsSolution:

  1. Exact replacement — same Allen-Bradley catalog number, new or refurbished, tested and warrantied
  2. Form-fit-function equivalent — alternate revision or build that drops in without code changes
  3. Engineered migration — current-generation Allen-Bradley platform with documented conversion notes

Contact our engineering team if you need help choosing between these tracks.

Technical Specifications

Manufacturer: Allen-Bradley (Rockwell Automation)

Series: PLC-5

Model: 1785-L40B

Memory: 48K Word SRAM

Total I/O: 2048 (Any Mix) or 2048 In + 2048 Out (Complementary)

Analog I/O: 2048

Communication Channels: 4 DH+/Remote I/O (Adapter or Scanner)

I/O Scan Time (per rack): 10 ms @ 57.6 kbit/s, 7 ms @ 115.2 kbit/s, 3 ms @ 230.4 kbit/s

Max I/O Chassis: 61

Serial Port: RS-232-C/422-A/423-A Configurable

Backplane Current Load: 3.3 A @ 5V

Applications

The Allen-Bradley PLC-5/40 1785-L40B Processor is specifically designed to excel in a wide array of large and complex industrial applications, including:

  • Large-Scale Manufacturing Plants: Optimizes control over extensive production lines, assembly processes, and automated machinery, ensuring high throughput and consistent quality.
  • Complex Process Control Systems: Ideal for managing intricate chemical, pharmaceutical, and food processing operations, where precise control of parameters like temperature, pressure, and flow is critical.
  • Water and Wastewater Treatment Facilities: Provides robust control for comprehensive operations, including pumping stations, purification processes, and distribution networks, ensuring efficient and reliable service.
  • Power Generation and Distribution: Facilitates the efficient monitoring and control of power plants, substations, and energy distribution networks, ensuring stable and reliable power supply.
  • Oil & Gas Exploration and Processing: Manages complex drilling, extraction, and refining processes, providing critical control in hazardous and demanding environments.
  • Mining Operations: Controls heavy machinery, conveyors, and processing equipment in mining facilities, enhancing safety and operational efficiency.

Why Choose the 1785-L40B?

This processor offers exceptional performance for demanding tasks. It is built to consistently handle the most intensive industrial applications, delivering extraordinary processing capabilities and an abundance of memory.

Availability & Shipping

  • In stock: 1785-L40B ready for immediate dispatch from our Florida warehouse.
  • Free USA shipping: FedEx Priority (2–5 business days) and UPS Ground (3–5 business days). Expedited options available at checkout.
  • Worldwide delivery: FedEx International Priority (1–5 days), UPS International Priority (3–5 days), and USPS International (5–10 days) — rates calculated at checkout.
  • Bulk pricing: Volume discounts on request — contact our sales team for quantity quotes.
  • Buy with confidence: Every 1785-L40B ships with a 1-Year PALM Parts warranty and a 30-day return window.
SUPPORT

Frequently Asked Questions — Allen-Bradley

The 1785-L40B features a generous 48K Word SRAM, providing ample space for complex control programs and extensive operational data storage.

Machine down? We ship parts the same day.

New, surplus, and refurbished Allen-Bradley inventory in stock. Request a quote or speak directly with an automation specialist for emergency sourcing.

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PALM Parts Solution operates as an independent industrial automation supplier and is not an authorized distributor or affiliate of any listed manufacturer or brand name. Manufacturer trademarks and product names are used solely for identification purposes. Original manufacturer warranties do not apply. All products sold by PALM Parts are backed by our own 1-year warranty.

Product Condition & Firmware

All products are sold as new unless stated otherwise. Original manufacturer packaging may show signs of handling, storage, or shelf wear. Date codes and series may vary from current factory production. PALM Parts does not guarantee the presence, version, or compatibility of any firmware on PLC or automation products.

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