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- Allen Bradley
- 1785-L20B
- PLC-5/20 Processor
- USA
- 165 x 51 x 89 mm
- 1.45 kg
- Xiamen, China
- New & In Stock
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- 1 Year
- 1-3 Working Days
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Our advantage
Global Logistics
We have a 10-year logistics and express cooperation agreement, so our products can be shipped to any place in the world.
Brand new and original
Our products are imported in bulk from the place of origin. Because of the cooperative relationship, our products are all original and 100% new.
24-hour service
We provide 7*24 hours service to our customers. We will be there whenever you need us.
Price advantage
All our products are priced very favorably because we have our own warehouse and supply.
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Product Overview
The Allen Bradley 1785-L20B is a PLC-5/20 Processor, designed as the central processing unit for PLC-5 automation systems requiring higher performance and faster processing than the PLC-5/11 series. It is ideal for complex control applications, offering enhanced memory, faster scan times, and reliable industrial operation.
Technical Specifications
| Parameter | Details |
|---|---|
| Manufacturer | Allen Bradley |
| Model | 1785-L20B |
| Product Type | PLC Processor |
| Function | Central processing unit for PLC-5 systems |
| Compatibility | PLC-5 I/O modules and racks |
| Dimensions | 165 × 51 × 89 mm |
| Weight | 1.45 kg |
| Operating Environment | Industrial automation and process control systems |
Function and Working Principle
The 1785-L20B functions by:
- Executing user-defined PLC programs with high-speed processing
- Reading inputs from PLC-5 I/O modules
- Generating output commands to control machines and processes
- Handling communication with HMIs, networked PLCs, and other industrial devices
As the core of the PLC-5 system, it ensures deterministic, high-performance control for demanding industrial automation tasks.
Role in Industrial Automation
The processor is key for:
- Controlling complex manufacturing and process operations
- Coordinating logic, sequencing, and data handling
- Managing communication between controllers, operator interfaces, and networked devices
- Supporting high-reliability systems that require rapid scan times
Industrial Applications
Typical applications include:
- High-speed manufacturing automation systems
- Process control in chemical, oil & gas, and power plants
- Material handling and automated packaging lines
- Networked PLC environments requiring fast response and data processing
- Industrial systems with large numbers of I/O modules
Installation and System Integration
Installation steps:
- Insert the 1785-L20B processor into a PLC-5 rack
- Connect compatible I/O modules and power supply
- Configure using RSLogix 5 or compatible programming software
- Verify input/output functionality, program execution, and network communication
The processor’s industrial-grade design ensures reliable performance in demanding automation environments.
Compatible System Components
- PLC-5 I/O racks and modules
- Allen Bradley communication modules (e.g., 1785-ENET, 1785-BCM)
- Operator interfaces and HMIs
- RSLogix 5 programming software
- Networked PLC-5 or ControlLogix systems
Recommended Alternative Models
| Model | Type | Key Feature | Application |
|---|---|---|---|
| Allen Bradley 1785-L20B | PLC Processor | PLC-5/20 high-performance CPU | Complex industrial automation |
| Allen Bradley 1785-L11B/E | PLC Processor | PLC-5/11 enhanced version | Mid-range industrial control |
| Allen Bradley 1785-L40B | PLC Processor | Advanced PLC-5/20 CPU | Large-scale and high-speed industrial systems |
Key Advantages
- High-speed, reliable control for complex PLC-5 applications
- Supports large I/O configurations and fast scan times
- Enables network communication and integration with industrial HMIs
- Compact, rugged design for harsh industrial environments
- Enhances automation efficiency, reliability, and performance
Technical FAQs
What is the main purpose of the 1785-L20B?
It serves as the central processor for PLC-5 systems, providing high-speed logic, sequencing, and I/O control.
Which I/O modules is it compatible with?
Compatible with all PLC-5 I/O racks and modules.
Does it support communication with other devices?
Yes, via Allen Bradley communication modules such as Ethernet or DH+ networks.
Where is it typically applied?
In complex industrial automation, high-speed manufacturing, and process control environments.
Conclusion
The Allen Bradley 1785-L20B PLC-5/20 Processor is a high-performance and reliable CPU for industrial automation systems. With its fast processing, support for large I/O configurations, and network integration, it is ideal for complex PLC-5 applications in manufacturing, process industries, and critical automation networks.