- Functions as the central processor in a Mini-PLC-2 control system
- Executes the stored ladder program and coordinates assigned 1771 I/O
- Requires the original rack addressing and application backup during replacement
1772-LN2 serves as the central Mini-PLC-2 processor, executing the ladder application while coordinating the input and output image for the connected 1771 I/O.
Its 1,024-word memory is shared by the data table, user program, and optional message storage, so the installed memory allocation must be preserved when the processor is replaced.
Before returning the system to service, restore the verified program, confirm rack addressing and I/O assignments, and validate the original timers, counters, messages, and machine sequence.
Availability, condition, price, and shipping time for 1772-LN2 are confirmed during quotation.
Allen-Bradley 1772-LN2 Mini-PLC-2 Processor Manuals, Datasheets, Links
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
- The official Mini-PLC-2 documentation identifies 1,024 words of memory for 1772-LN2.
- The factory data table is 128 words and may be reduced within the documented limits.
- User-program and message-storage capacity depends on the selected data-table allocation.
- Input and output image tables connect field status to the ladder program.
- Timer and counter preset and accumulated values occupy defined data-table areas.
- The retained program must use the same documented PLC-2 memory-address structure.
- Back up the complete application before removing the installed processor.
- Record the data-table allocation and I/O addresses used by the machine.
- Confirm the full catalog number rather than selecting only by memory size.
- Maintenance of machines built around the documented Mini-PLC-2 processor architecture.
- Legacy ladder-control applications using PLC-2 memory and image-table addressing.
- Like-for-like processor replacement where the original application can be restored and validated.