Allen-Bradley PLC-2/20 Programmable Controller: Comprehensive Industrial Automation Solution
Allen-Bradley PLC-2/20 Programmable Controller
Advanced Industrial Automation Solution for Complex Control Applications
Product Overview
The Allen-Bradley PLC-2/20 (AB22-20) is a high-performance programmable logic controller designed for demanding industrial automation applications. As part of the renowned PLC-2 family from Rockwell Automation, this controller offers robust performance, reliability, and flexibility for complex motion control and automation systems.
Originally developed by Allen-Bradley (now Rockwell Automation), the PLC-2/20 has established itself as a trusted solution in various industrial sectors, providing precise control capabilities for manufacturing processes, material handling systems, and automated production lines.
Product Visual Documentation
Key Features and Capabilities
- High Memory Capacity: 8K words (16 data bits each) memory capacity for complex program storage
- Advanced Programming Capabilities: Supports ladder logic programming with extensive instruction set
- Modular I/O System: Compatible with comprehensive range of 1772 I/O modules
- Industrial Durability: Designed for harsh industrial environments with robust construction
- Motion Control Integration: Excellent choice for industrial automation and motion control applications
- Network Connectivity: Supports various communication protocols for system integration
- Diagnostic Features: Comprehensive status indicators and diagnostic capabilities
- Scalable Architecture: Can be expanded with additional modules as needed
Technical Specifications
| Specification | Details |
|---|---|
| Processor Type | PLC-2/20 Programmable Controller |
| Memory Capacity | 8K words (16 data bits each) |
| I/O Compatibility | 1772 Series I/O Modules |
| Programming Language | Ladder Logic |
| Programming Terminal | 1770-T1, T2, T3 Series |
| Communication | RS-232, Data Highway |
| Operating Temperature | 0°C to 60°C (32°F to 140°F) |
| Storage Temperature | -40°C to 85°C (-40°F to 185°F) |
| Relative Humidity | 5% to 95% non-condensing |
| Vibration Resistance | 10-55 Hz, 0.15mm amplitude |
Industrial Applications
Manufacturing Automation
Assembly line control, robotic integration, quality control systems
Material Handling
Conveyor systems, automated storage and retrieval, packaging lines
Process Control
Chemical processing, food and beverage production, pharmaceutical manufacturing
Motion Control
CNC machines, positioning systems, servo motor control
Building Automation
HVAC control, lighting systems, security integration
Energy Management
Power distribution control, renewable energy systems, utility automation
Frequently Asked Questions
The PLC-2/20 and PLC-2/30 are part of the same family but differ in processing power and memory capacity. The PLC-2/30 typically offers enhanced capabilities and expanded I/O handling for more complex applications.
The PLC-2/20 uses the 1770-T1, T2, or T3 programming terminals as primary programming devices. These dedicated terminals provide ladder logic programming capabilities specifically designed for the PLC-2 family.
Yes, the PLC-2/20 supports communication protocols like Data Highway and RS-232, which can be interfaced with modern systems through appropriate gateways and communication modules.
The PLC-2/20 is compatible with the comprehensive 1772 series I/O modules, including digital input/output, analog input/output, and specialty modules for various industrial applications.
While the PLC-2/20 is a legacy product, technical documentation and support may still be available through Rockwell Automation's technical support channels and authorized distributors.
Regular maintenance includes cleaning air filters (if applicable), checking connections, monitoring operating temperatures, and periodic backup of program memory. The robust design ensures minimal maintenance requirements in typical industrial environments.
Industry Recognition and Trust Metrics
Manufacturer Reputation: Allen-Bradley (Rockwell Automation) is a globally recognized leader in industrial automation with over 100 years of industry experience.
Industry Standards Compliance: The PLC-2/20 complies with relevant industrial standards including UL, CSA, and CE certifications for industrial control equipment.
Documentation Quality: Comprehensive technical documentation including user manuals, programming guides, and installation instructions are available from official sources.
Global Deployment: Thousands of PLC-2/20 units have been deployed worldwide across various industries, demonstrating proven reliability and performance.
Technical References: Official documentation and technical specifications are available through Rockwell Automation's technical library and authorized distributors.
System Integration and Compatibility
The PLC-2/20 offers excellent integration capabilities with various industrial systems:
- Network Integration: Compatible with Data Highway networks for distributed control systems
- I/O Expansion: Supports extensive I/O expansion through 1772 series modules
- Programming Tools: Works with dedicated 1770 series programming terminals
- Legacy System Support: Can interface with older automation equipment through appropriate interfaces
- Modern Integration: Can be integrated into modern control systems through protocol converters
Conclusion
The Allen-Bradley PLC-2/20 (AB22-20) represents a significant milestone in industrial automation technology. While it may be considered a legacy product in today's rapidly evolving automation landscape, its robust design, proven reliability, and extensive deployment history make it a valuable asset for many industrial applications.
For facilities maintaining existing PLC-2/20 systems or those requiring reliable, time-tested automation solutions, this controller continues to offer dependable performance. Its compatibility with the comprehensive 1772 I/O module family and established programming methodology ensures continued operation in critical industrial processes.
As with all industrial automation equipment, proper maintenance, regular backups, and adherence to manufacturer guidelines are essential for optimal performance and longevity of the PLC-2/20 system.
