Allen Bradley 1785-L20B PLC-5/20 Processor

Product Introduction

The Allen Bradley 1785-L20B PLC-5/20 Processor is a mid-range programmable logic controller processor designed for industrial automation systems requiring reliable processing power and communication capability. Manufactured by Rockwell Automation and part of the Allen-Bradley PLC-5 controller family, the processor provides dependable control performance for manufacturing and process industries.

The 1785-L20B processor offers 16K Word SRAM memory for ladder logic programs and operational data. It supports up to 512 inputs and 512 outputs, making it suitable for medium-scale automation systems. With built-in Data Highway Plus (DH+) communication and support for DH+ / Remote I/O networks, the processor enables efficient communication between controllers, distributed I/O modules, and supervisory systems.

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Product Specifications

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Applications

• Manufacturing automation systems, controlling machinery, sensors, and actuators across production lines.

• Process control environments, managing industrial processes that require stable controller performance.

• Material handling systems, coordinating conveyors, robotic equipment, and automated storage systems.

• Distributed control networks, connecting remote I/O modules through DH+ and Remote I/O communication.

• Industrial monitoring systems, collecting operational data for supervisory control platforms.

• Legacy PLC-5 infrastructure, maintaining and expanding existing PLC-5 automation installations.

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Advantages

• 16K Word SRAM memory capacity, allowing more complex control programs and logic operations.

• Support for 512 inputs and 512 outputs, enabling control of medium-sized automation systems.

• Integrated Data Highway Plus communication, providing reliable industrial network connectivity.

• Remote I/O compatibility, supporting distributed I/O architectures across large industrial plants.

• Modular PLC-5 architecture, allowing flexible system expansion with additional I/O and communication modules.

• Industrial-grade reliability, designed for continuous operation in demanding automation environments.

FAQ

1. What memory capacity does the 1785-L20B processor provide?
   The processor includes 16K Word SRAM for storing ladder logic programs and control data.

2. How many I/O points can the processor support?
   It supports up to 512 inputs and 512 outputs within a PLC-5 automation system.

3. What communication networks are supported by this processor?
   The module supports Data Highway Plus (DH+) and DH+ / Remote I/O communication networks.

4. How does the processor interact with I/O modules?
   It communicates with installed modules through the PLC-5 backplane and network interfaces.

5. What type of programming is used for the PLC-5/20 processor?
   The processor is typically programmed using ladder logic.

6. Can the processor be used in distributed I/O systems?
   Yes, it supports Remote I/O configurations for distributed industrial control architectures.

7. What role does the processor play in a PLC-5 system?
   It executes control programs, processes input signals, and manages communication between modules.

8. Is the processor suitable for upgrading older PLC-5 installations?
   Yes, it is commonly used in maintaining or expanding legacy PLC-5 automation systems.

9. How does DH+ communication benefit industrial control systems?
   DH+ allows high-reliability data exchange between PLC controllers and network devices.

10. What types of industrial environments typically use this processor?
    Manufacturing plants, processing facilities, machine automation systems, and large industrial control networks.

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