Overview
The Allen-Bradley 1772-LN2 is a compact mini-PLC-2 processor engineered for flexible industrial control applications. With a 1024-word memory capacity and support for up to 32 I/O devices, this controller delivers straightforward logic control without unnecessary complexity. Its CMOS read/write memory architecture stores user programs, I/O device status, and numeric values, making it a dependable choice for retrofit and maintenance scenarios where legacy automation expertise is essential.
Key Features
- 1024-word memory organized into user program, data table, and message storage areas
- 32 I/O capacity for flexible device control
- Read/Write CMOS memory for non-volatile program and status storage
- Arithmetic operations (addition, subtraction) and timing/counting functionality
- RS-232-C interfacing and data highway compatibility
- Three diagnostic indicators for operational status monitoring
Technical Specifications
| Part Number | 1772-LN2 |
| Processor Type | Mini-PLC-2 |
| Memory Capacity | 1024 words |
| I/O Capacity | 32 devices maximum |
| Memory Type | CMOS Read/Write |
| Communication Interface | RS-232-C, Data Highway |
| Operating Functions | Arithmetic, timing/counting, I/O forcing, data comparison |
| Diagnostic Indicators | Three status indicators |
| Series | Allen-Bradley 1772 PLC-2 Family |
| Condition | Used |
Typical Applications
The 1772-LN2 excels in:
- Process control and monitoring systems
- Material handling and palletizing operations
- Measurement and gauging applications
- Pollution control and environmental monitoring
- Machine sequencing and discrete manufacturing
- Legacy system maintenance and field retrofits
Compatibility & Replacements
As a mini-PLC-2 processor, the 1772-LN2 integrates with the Allen-Bradley 1772 family I/O module ecosystem. Replacement modules and expansion options within the 1772 series—such as analog input, discrete output, and specialty communication modules—connect directly to the processor. For modern system migrations, Rockwell Automation’s CompactLogix or ControlLogix platforms provide comparable or enhanced functionality. When restocking or upgrading legacy installations, verify compatibility with existing 1772-series peripherals and consider firmware revision levels before deployment.
