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- Allen Bradley
- 1785-LT3
- PLC-5/12 Processor
- USA
- 165 x 51 x 89 mm
- 1.337 kg
- Xiamen, China
- New & In Stock
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We have a 10-year logistics and express cooperation agreement, so our products can be shipped to any place in the world.
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Our products are imported in bulk from the place of origin. Because of the cooperative relationship, our products are all original and 100% new.
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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-LT3 is a PLC-5/12 Processor, designed for compact and entry-level PLC-5 systems. It provides efficient and reliable control for small-scale automation applications, making it ideal for simple industrial processes. The LT3 is optimized for lightweight programs and smaller I/O configurations, offering a cost-effective solution with deterministic operation in industrial environments.
Technical Specifications
| Parameter | Details |
|---|---|
| Manufacturer | Allen Bradley |
| Model | 1785-LT3 |
| 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 | 1.337 kg |
| Operating Environment | Industrial automation and process control systems |
Function and Working Principle
The 1785-LT3 operates by:
- Executing small-scale PLC programs for industrial control
- Reading input signals from connected PLC-5 I/O modules
- Generating output commands to machinery and devices
- Providing basic communication with HMIs or other PLCs
- Managing smaller memory programs and simple automation logic
It serves as the central controller for entry-level systems, providing reliable, deterministic operation for compact industrial automation.
Role in Industrial Automation
The processor is ideal for:
- Small-scale manufacturing or process control
- Coordinating limited I/O modules in compact PLC-5 racks
- Providing deterministic and reliable control for simple automation tasks
- Cost-effective solution for applications with lightweight program requirements
Industrial Applications
Typical applications include:
- Small assembly lines or machinery control
- Light process control in water treatment, chemical processing, or packaging
- Compact material handling or logistics equipment
- Entry-level automation where limited logic and I/O management are sufficient
Installation and System Integration
Installation steps:
- Insert the 1785-LT3 processor into a compatible PLC-5 rack
- Connect PLC-5 I/O modules and power supply
- Configure using RSLogix 5 or compatible software
- Verify program execution, input/output operation, and basic network communication
The compact and rugged design ensures ease of installation and long-term reliability in industrial environments.
Compatible System Components
- PLC-5 I/O racks and modules
- Allen Bradley communication modules (for small networks)
- RSLogix 5 programming software
- HMIs and operator interface panels
Recommended Alternative Models
| Model | Type | Key Feature | Application |
|---|---|---|---|
| Allen Bradley 1785-LT3 | PLC Processor | PLC-5/12 CPU | Small-scale, entry-level automation systems |
| Allen Bradley 1785-LT | PLC Processor | PLC-5/15 CPU | Entry-level control with slightly higher program capacity |
| Allen Bradley 1785-LT2 | PLC Processor | PLC-5/25 CPU | Small- to mid-scale automation with more memory |
| Allen Bradley 1785-L20B | PLC Processor | PLC-5/20 CPU | Mid-range automation systems |
Key Advantages
- Reliable entry-level PLC-5 control
- Compact form factor for small racks
- Supports smaller program sizes and I/O modules
- Rugged industrial-grade design
- Cost-effective solution for simple industrial automation
Technical FAQs
How does the LT3 differ from the LT or LT2?
The LT3 has slightly smaller program capacity and processing capability, making it the most entry-level CPU in the LT family, suitable for very simple automation tasks.
Which I/O modules is it compatible with?
Compatible with all PLC-5 I/O racks and modules, optimized for small-scale systems.
Does it support network communication?
Yes, basic communication is supported through Allen Bradley communication modules.
Where is it typically applied?
Used in small-scale, entry-level industrial automation systems requiring reliable, deterministic control without high-speed or complex logic requirements.
Conclusion
The Allen Bradley 1785-LT3 PLC-5/12 Processor is a compact, entry-level CPU designed for small-scale PLC-5 automation systems. With its rugged design, cost-effective operation, and reliable deterministic control, it is ideal for industrial applications where simplicity, reliability, and low program complexity are the primary requirements.