Allen-Bradley · PLC-2 Core Memory
Allen-Bradley 1772-M16 PLC-2 16K Core Memory Module
Fixed 16K-word core memory for larger supported PLC-2 applications.
Product Overview
For PLC-2 applications that require the larger core-memory class, the 1772-M16 provides 16K words of controller storage.
The 1772-M16 memory budget covers the user program together with data-table, I/O image and communication-related storage assigned by the controller application.
Selection must retain the full 1772-M16 catalog because capacity and power-supply compatibility cannot be inferred from a generic PLC-2 memory description.
Technical Data
| Technical Item | 1772-M16 |
|---|---|
| Brand | Allen-Bradley |
| Product Type | Core Memory Module |
| Brand Country | United States |
| Controller Family | PLC-2 |
| Memory Capacity | 16K words |
| Catalog Series | Bulletin 1772 |
| Capacity Class | Fixed |
| Stored Information | Program and controller data |
| Related Smaller Module | 1772-M8 |
Expanded Program Storage
Larger logic set
The 16K class supports a larger combined program and data image than the 8K module when the processor arrangement is compatible.
Data allocation
Tables, I/O images and messages still reduce the words available for instructions.
Change control
Document the final memory map so maintenance teams can judge future edits against the same boundary.
Power-Supply Compatibility
For 1772-M16, power-supply compatibility must be reviewed with the installed controller hardware and saved application rather than treated as an isolated catalog-number change.
- Confirm the supported PLC-2 processor configuration.
- Verify the installed power supply for the memory arrangement.
- Restore and test the saved application before production.
Practical Questions
Why might a program still not fit in 1772-M16 even though it is a 16K module?
The capacity is shared by the program and controller data structures. Recalculate the data table, I/O images and message area before assuming all 16K words are available for logic.
Can 1772-M16 be ordered from the memory size alone?
Use the full 1772-M16 catalog and identify the target PLC-2 processor configuration. The power supply and controller arrangement should be checked before the purchase is finalized.
What should be preserved before a 1772-M16 exchange?
Create a verified backup of the application and record the memory and I/O layout. That information is needed to load the replacement and confirm that the controller has returned to the intended state.
How is 1772-M16 different from 1772-M8?
The two core-memory modules represent 16K-word and 8K-word capacity classes. A capacity increase does not remove the need to confirm processor and power-supply compatibility.
What commissioning checks follow installation of 1772-M16?
Verify processor status, recognized memory, program integrity and I/O image behavior. Any memory or parity indication should be resolved before enabling automatic operation.
Why should 1772-M16 not be confused with segmented 1772-ME memory?
They use different memory arrangements and are selected differently. The M16 catalog identifies a fixed 16K core-memory module, while 1772-ME capacity is established through segments.
Rapid Enquiry Response
Moore Automation
A clear route from shortage to quotation
When a line is waiting for a replacement, Moore Automation reviews the complete part number, required quantity and delivery need as one enquiry. Available sourcing options can then be compared without losing the exact requested identity.
An assigned account manager maintains the conversation through price confirmation, order coordination and dispatch updates.
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