Overview
The Allen-Bradley 1772-LG is a processor control module designed for the PLC-2/30 programmable controller system. This module serves as the central processing unit that monitors input devices, executes user-written programs, and controls output devices based on logic instructions. The 1772-LG integrates with Allen-Bradley I/O modules, interface modules, and power supplies to form a complete automation control system suitable for process control, palletizing, material handling, and monitoring applications.
Key Features
- CMOS read/write memory for program storage and data management
- Programmable memory supports ladder diagram and functional block programming
- 4-position mode select switch on front panel for operational control
- Supports up to 896 inputs and 896 outputs in configured systems
- Data Highway interface compatibility for network connectivity
- Selectable timed interrupt capability and report generation
- Full on-line programming and data change functionality
Technical Specifications
- Module Type: Processor Control Module
- System: PLC-2/30
- Memory: CMOS (read/write)
- I/O Capacity: Up to 896 inputs, 896 outputs
- Input Voltage: 120–240 VAC (via power supply)
- Programming Method: Ladder diagram or functional block display
- Interface: Data Highway compatible
- Control Functions: Relay-type functions, timing, self-monitoring, diagnostics
- Weight: Approximately 25 lbs
- Mounting: Rack-mount chassis compatible
Typical Applications
The Allen-Bradley 1772-LG processor control module is used in a wide range of industrial environments:
- Process control and automation
- Material handling and palletizing systems
- Pollution control and environmental monitoring
- Measurement and gauging applications
- Sequential machine control
- Batch processing operations
Compatibility & Replacements
The 1772-LG module is part of the Allen-Bradley PLC-2 series and works with the complete PLC-2/30 controller ecosystem, including the 1772-LP3 processor, 1772 series I/O modules, 1771-series power supplies, and Data Highway network interfaces. It is compatible with Allen-Bradley programming terminals such as the 1770-T3 and 1784-T50. While this is legacy PLC-2 hardware, it remains in use in many industrial facilities and is available through industrial parts distributors. Consult technical documentation for integration details with modern systems.
