Overview
The Allen-Bradley 1772-LXP is a Mini-PLC-2/16 processor module designed for compact industrial control applications. This processor features a self-contained 120/240V AC power supply, eliminating the need for external power modules. With 4K-word SRAM and support for 256 total I/O points across 16 I/O module slots, it delivers flexible control capabilities for small to medium-scale automation systems. The 1772-LXP is ideal for process control, machine automation, and legacy system replacements where compact form factor and integrated power are essential.
Key Features
- Integrated Power Supply: Self-contained 120/240V AC power supply (switch-selectable) with input voltage ranges of 97–132V AC and 194–264V AC
- Advanced Programming: Supports online programming, online data change, block transfer instructions, jump instructions, and subroutine capabilities
- Extended Arithmetic: Features expanded arithmetic functions including addition, subtraction, multiplication, division, sine/cosine, and binary/BCD conversions
- Memory Management: 4K-word SRAM with lithium battery backup capable of maintaining memory for up to one year without AC power
- I/O Flexibility: Supports 256 I/O points with selectable timed interrupt for recurring subroutines and full I/O forcing in 2-slot addressing mode
- Communication Capabilities: Includes data highway interface, report generation, and mode select key switch with diagnostic indicators
Technical Specifications
- Input Voltage: 120/240V AC switch-selectable; 97–132V AC (120V) or 194–264V AC (240V)
- Input Current: 0.8/0.4 Amps maximum (120V/240V)
- Frequency: 47–63 Hz
- Output Power: 5V DC at 4 Amps for I/O modules
- Memory: 4K-word SRAM; 4K-word EEPROM for program backup
- I/O Capacity: 256 total points across up to 16 I/O module slots
- Scan Time: 12.5 milliseconds per K-word of user memory
- Operating Temperature: 32°F to 140°F (0°C to 60°C)
- Processor Mode: Mode select key switch (PROG, R/P, RUN, MEM STORE)
- Interface Port: 15-pin interface connector for system integration
- Series: PLC-2 Mini-PLC-2/16 (also compatible with Mini-PLC-2/02 and Mini-PLC-2/17 instruction sets)
- Certification: Rockwell Automation / Allen-Bradley legacy equipment
Typical Applications
The 1772-LXP processor is well-suited for:
- Process control systems in food, beverage, and chemical industries
- Machine tool and packaging machinery automation
- Facilities and building automation control
- HVAC and environmental monitoring systems
- Replacement for legacy PLC-2 control systems requiring minimal form-factor
- Educational and training environments for industrial control programming
Compatibility & Replacements
Compatible With
- Allen-Bradley 1772-series I/O modules (1771-series digital and analog input/output modules)
- 1772-series backplane and I/O chassis assemblies
- Data Highway protocol-based communication networks
- Mode select key switches (remote mode selection available)
- Lithium battery backup systems for memory retention
Replaces / Drop-In Replacement For
- 1772-LX processor (non-integrated power supply variant)
- 1772-LWP processor (alternative Mini-PLC-2/16 configuration)
- Legacy PLC-2/16 systems requiring single-unit processor/power consolidation
- Earlier revision 1772-LXP Series C and Series D models
Works With
- Programming: Ladder diagram and functional block programming languages
- Communication: Data Highway interface for network integration
- Protocols: Allen-Bradley proprietary PLC-2 communication protocol
- Integration: Online programming and data change capabilities for live system modification
- Memory: EEPROM backup and battery-backed SRAM for non-volatile program storage
