PLC-2 memory component · Bulletin 1772
Allen-Bradley 1772-M8 PLC-2 8K Core Memory Module
An 8K-word core-memory option for supported PLC-2 processor arrangements.
Product Description
Within a compatible Bulletin 1772 controller arrangement, the 1772-M8 provides a fixed 8K-word core-memory class for the PLC-2 processor.
Program logic shares that capacity with the controller data table, I/O image and other required storage areas. The usable space for instructions therefore depends on the complete memory allocation rather than the catalog capacity alone.
The full 1772-M8 designation separates this fixed-capacity module from the segmented 1772-ME construction and the larger 1772-M16 capacity class.
Technical Specifications
| Technical Item | 1772-M8 |
|---|---|
| Brand | Allen-Bradley |
| Product Type | Core Memory Module |
| Brand Country | United States |
| Catalog Series | Bulletin 1772 |
| Controller Family | PLC-2 |
| Memory Technology | Core memory |
| Memory Capacity | 8K words |
| PLC-2 Word Size | 16 bits |
| Memory Areas | Data table, user program and message storage |
| Supported Processor Classes | PLC-2/20 and PLC-2/30 |
| Compatible Processor Catalogs | 1772-LP1, 1772-LP2 and 1772-LP3 |
| Excluded Processor Catalog | 1772-LR |
| Required Power Supply | 1772-P1 Series C |
Memory Capacity & Compatibility
Capacity plan
Reserve words for the data table and controller housekeeping before assigning the remainder to the user program.
Processor match
Confirm that the installed PLC-2 processor configuration accepts the 8K core-memory module.
Migration check
A move to a different memory size requires review of the program image and controller hardware, not only a catalog swap.
Installation & Integration
For 1772-M8, installation & integration must be reviewed with the installed controller hardware and saved application rather than treated as an isolated catalog-number change.
- Remove controller power before hardware work.
- Seat the module in the designated processor configuration.
- Verify memory and I/O operation after restoration.
Frequently Asked Questions
How much application space is actually available in 1772-M8?
The module belongs to the 8K-word capacity class, but the user program does not receive every word. Data-table and controller storage requirements must be subtracted when checking fit.
Can 1772-M8 be replaced by 1772-M16 without reviewing the PLC-2 installation?
Do not treat the larger capacity as a drop-in decision by itself. Confirm processor compatibility, hardware requirements and the saved program image before changing memory type.
What backup is needed before removing 1772-M8?
Save the current program and record the controller's data-table and I/O arrangement. A physical replacement without a recoverable image can turn a simple hardware job into a controller recommissioning task.
Why is the complete 1772-M8 catalog important on a purchase order?
It identifies the 8K core-memory product rather than the segmented 1772-ME or 16K 1772-M16 module. The shared 1772 prefix is not enough to preserve capacity and construction.
What should be checked after installing 1772-M8?
Confirm that the processor recognizes the expected memory and that the restored program fits without memory errors. Then verify I/O image operation and controller status before returning the machine to automatic control.
Is 1772-M8 intended as general storage outside a PLC-2 controller?
No; it is controller memory for a compatible PLC-2 processor arrangement. Its value is tied to the legacy control system's program and operating-data requirements.
Original Product Assurance
Moore Automation
Identity checks before a quotation leaves
Incoming enquiries are reviewed against the brand and complete catalog number. This matters for legacy products where a single letter or memory-capacity suffix can change system compatibility.
Moore Automation supplies original industrial automation components with a one-year warranty and keeps model clarification, quotation and dispatch communication together.
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