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Allen-Bradley 1785-L20B
by Allen-Bradley
Read verified buyer reviews ↓OverviewThe Allen-Bradley 1785-L20B PLC-5/20 Processor Module serves as a foundational component within the esteemed PLC-5 product line, meticulously designed to provide robust and precise command over mid-sized industrial automation scenarios. This high-performance unit features 16K words of onboard memory, offering substantial capacity to manage sophisticated control logic and data processing requirements with exceptional efficiency. Its design prioritizes unwavering reliability, adaptability, and smooth integration, positioning it as an optimal solution for enhancing or deploying dependable control systems across numerous industrial sectors. Leveraging the established architecture of the PLC-5 series, the 1785-L20B offers extensive communication options, including integrated ports for Data Highway Plus (DH+), RS-232-C, and Remote I/O. This comprehensive array of connection choices ensures flexible integration with a wide variety of I/O modules and network protocols, guaranteeing compatibility within diverse industrial landscapes. The modular construction further augments its versatility, permitting straightforward expansion and configuration within existing PLC-5 chassis, thereby maximizing system uptime and reducing installation complexity.Key Features PLC-5/20 Processor Architecture: Optimized for dependable control in mid-range industrial automation. 16K Words of User Memory: Ample memory resources for intricate control programs and data management. Integrated Communication Interfaces: Includes DH+, RS-232-C, and Remote I/O for broad connectivity. Modular and Scalable Design: Compatible with Allen-Bradley PLC-5 chassis and I/O modules, enabling flexible system setups. Exceptional Industrial Durability: Constructed to endure demanding operational conditions and ensure continuous performance. RSLogix 5 Software Capability: Fully programmable using industry-standard RSLogix 5 or equivalent software for simplified development. Effortless System Integration: Engineered for easy incorporation into current or new PLC-5 based control systems. Technical Specifications Model: 1785-L20B Processor Type: PLC-5/20 Memory Capacity: 16K words Power Requirements: Supplied via the PLC-5 chassis backplane Communication Protocols: Data Highway Plus (DH+), RS-232-C, Remote I/O Operating Temperature: 0°C to 60°C (32°F to 140°F) Storage Temperature: -40°C to 85°C (32°F to 185°F) Mounting: Standard PLC-5 chassis Brand: Allen-Bradley ApplicationsThe Allen-Bradley 1785-L20B PLC-5/20 Processor Module is ideally suited for a wide array of industrial applications demanding precise, reliable, and scalable control. Its robust construction and versatile features make it a preferred selection for: Manufacturing Automation: Orchestrating complex assembly lines, robotic cells, and production machinery. Process Control Systems: Managing continuous and batch operations in sectors like chemical, food and beverage, and pharmaceuticals. Batch and Sequence Control: Implementing elaborate sequential operations with high precision and repeatability. Material Handling Systems: Automating conveyor systems, automated storage and retrieval systems (AS/RS), and packaging lines. Energy Management: Optimizing electrical distribution and energy usage within industrial facilities. Water and Wastewater Treatment: Directing filtration, pumping, and treatment sequences. Why ChooseSelecting the Allen-Bradley 1785-L20B PLC-5/20 Processor Module delivers numerous benefits to your industrial operations, guaranteeing sustained performance and dependability. Proven Performance and Longevity: As a part of the highly regarded PLC-5 series, this module boasts a history of dependable operation and lasting reliability in challenging industrial settings. Flexible and Scalable Control: Its powerful processing capabilities and expandable architecture provide a control solution that adapts to evolving operational needs, safeguarding your investment. Effortless Integration: Designed for seamless compatibility, the 1785-L20B easily integrates with existing PLC-5 systems and various new components, ensuring a smooth transition and setup. Order NowEnhance your industrial control systems with the Allen-Bradley 1785-L20B PLC-5/20 Processor Module. Contact us today to learn more and place your order.FAQWhat types of applications is the 1785-L20B best suited for?The 1785-L20B is ideal for mid-sized industrial automation tasks, including manufacturing automation, process control, batch control, material handling, energy management, and water treatment systems.What communication protocols does the 1785-L20B support?This module supports Data Highway Plus (DH+), RS-232-C, and Remote I/O for versatile connectivity.Is the 1785-L20B compatible with existing PLC-5 systems?Yes, it is designed for seamless integration with existing PLC-5 chassis and I/O modules, facilitating easy upgrades and expansions.
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Allen-Bradley 1785-L20B
Overview
This is a genuine Allen-Bradley component from the PLC-5 Platform (Legacy) family. 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
- Engineered to integrate inside PLC-5 Platform (Legacy) installations
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:
- Exact replacement — same Allen-Bradley catalog number, new or refurbished, tested and warrantied
- Form-fit-function equivalent — alternate revision or build that drops in without code changes
- Engineered migration — current-generation Allen-Bradley platform with documented conversion notes for the PLC-5 Platform (Legacy) family
Contact our engineering team if you need help choosing between these tracks.
Technical Specifications
- Model: 1785-L20B
- Processor Type: PLC-5/20
- Memory Capacity: 16K words
- Power Requirements: Supplied via the PLC-5 chassis backplane
- Communication Protocols: Data Highway Plus (DH+), RS-232-C, Remote I/O
- Operating Temperature: 0°C to 60°C (32°F to 140°F)
- Storage Temperature: -40°C to 85°C (32°F to 185°F)
- Mounting: Standard PLC-5 chassis
- Brand: Allen-Bradley
Applications
The Allen-Bradley 1785-L20B PLC-5/20 Processor Module is ideally suited for a wide array of industrial applications demanding precise, reliable, and scalable control. Its robust construction and versatile features make it a preferred selection for:
- Manufacturing Automation: Orchestrating complex assembly lines, robotic cells, and production machinery.
- Process Control Systems: Managing continuous and batch operations in sectors like chemical, food and beverage, and pharmaceuticals.
- Batch and Sequence Control: Implementing elaborate sequential operations with high precision and repeatability.
- Material Handling Systems: Automating conveyor systems, automated storage and retrieval systems (AS/RS), and packaging lines.
- Energy Management: Optimizing electrical distribution and energy usage within industrial facilities.
- Water and Wastewater Treatment: Directing filtration, pumping, and treatment sequences.
Why Choose the 1785-L20B?
Selecting the Allen-Bradley 1785-L20B PLC-5/20 Processor Module delivers numerous benefits to your industrial operations, guaranteeing sustained performance and dependability.
- Proven Performance and Longevity: As a part of the highly regarded PLC-5 series, this module boasts a history of dependable operation and lasting reliability in challenging industrial settings.
- Flexible and Scalable Control: Its powerful processing capabilities and expandable architecture provide a control solution that adapts to evolving operational needs, safeguarding your investment.
- Effortless Integration: Designed for seamless compatibility, the 1785-L20B easily integrates with existing PLC-5 systems and various new components, ensuring a smooth transition and setup.
Availability & Shipping
- ▸In stock: 1785-L20B 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-L20B ships with a 1-Year PALM Parts warranty and a 30-day return window.
Frequently Asked Questions — Allen-Bradley
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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Independent Supplier Notice
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.