Allen-Bradley 1785-L11B PLC-5/11 Processor CPU Module
Allen-Bradley 1785-L11B PLC-5/11 Processor CPU Module
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Brand:Allen Bradley PLC Item No.:Allen-Bradley 1785-L11B Product Origin:USA Product Dimensions:266.7 × 38.1 × 177.8 mm Product Weight:1.36 kg Payment:T/T, Western Union, Credit Card Goods_stock:15 Shipping Port:Xiamen, China Lead Time:1-3 Days Condition:Brand New And Original Warranty:1 Year Certificate:COO
The Allen-Bradley 1785-L11B is a classic PLC-5/11 processor CPU module engineered for reliable industrial automation control in legacy PLC-5 systems. Developed by Rockwell Automation, this processor became a trusted solution in manufacturing plants, process industries, and machine automation environments requiring dependable ladder logic execution and stable remote I/O communication.
Known for its rugged architecture and long operational lifespan, the 1785-L11B continues to be widely used in brownfield facilities where proven PLC-5 infrastructure remains critical to daily production operations. It combines flexible communication capability, battery-backed memory, and industrial-grade durability in a well-established PLC platform.
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Applications
The 1785-L11B is widely deployed in:
Legacy manufacturing automation systems
PLC-5 machine and process control applications
Factory conveyor and material handling systems
Industrial remote I/O communication architectures
Packaging and assembly production lines
Brownfield modernization and retrofit projects
Its stable PLC-5 architecture makes it particularly valuable for facilities that require long-term operational continuity without complete system migration.
Advantages
Proven PLC-5 reliability for long-term industrial operation
Stable ladder logic execution for mission-critical systems
Battery-backed SRAM protects critical application data
Supports DH+ and remote I/O industrial networking
Flexible EEPROM backup options for secure program storage
Compatible with extensive legacy Allen-Bradley infrastructure
Rugged industrial construction for harsh environments
Excellent choice for retrofit and maintenance applications
Technical FAQs
1. What is the main function of the 1785-L11B?
It serves as the central processor CPU module for PLC-5 automation systems.
2. How much memory does it provide?
It includes 8 Kilowords of battery-backed SRAM memory.
3. Does it support DH+ communication?
Yes, it supports Data Highway Plus (DH+) networking.
4. What is the maximum I/O capacity?
Up to 512 total I/O points depending on system configuration.
5. Can it support remote I/O systems?
Yes, it supports universal remote I/O architectures.
6. Is the memory battery-backed?
Yes, SRAM memory is protected by battery backup.
7. What chassis does it install into?
A 1771 PLC-5 chassis system.
8. Is the 1785-L11B still in production?
It is considered a legacy PLC-5 platform product.
9. What replaces the PLC-5 platform today?
Modern ControlLogix systems are the primary migration path.
10. Why is the 1785-L11B still used in industry?
Many industrial facilities continue relying on PLC-5 infrastructure for stable long-term production operations.
