Allen-Bradley · PLC-2 Memory
Allen-Bradley 1772-ME PLC-2 Segmented CMOS RAM Memory Module
Segmented CMOS RAM storage for PLC-2 user programs, data tables, I/O images and message areas.
Product Overview
Designed for modular PLC-2 memory expansion, the 1772-ME is a segmented CMOS RAM module whose installed memory segments determine the available capacity.
The 1772-ME stores the user program together with data-table words, input and output image information and message-area data used by the controller.
Parity checking helps the PLC-2 identify a memory error, while the module occupies one slot in the 1772-LA processor chassis and must be handled as a system memory component rather than a general-purpose card.
Technical Data
| Technical Item | 1772-ME |
|---|---|
| Brand | Allen-Bradley |
| Product Type | Segmented CMOS RAM Memory Module |
| Brand Country | United States |
| Controller Family | PLC-2 |
| Memory Architecture | Segmented CMOS RAM |
| Stored Information | Program, data table, I/O image, message area |
| Error Detection | Parity checking |
| Processor Chassis | 1772-LA |
| Chassis Space | 1 slot |
Memory Expansion Architecture
Base module
The 1772-ME provides the PLC-2 memory-module structure and accepts the memory arrangement used to establish capacity.
Controller storage
Program instructions and operating data share the installed memory resource within the application layout.
Expansion decision
Capacity planning must consider both program growth and the words reserved for data and messages.
Program & Data Retention
For 1772-ME, program & data retention must be reviewed with the installed controller hardware and saved application rather than treated as an isolated catalog-number change.
- Account for the data table before estimating free space.
- Preserve the I/O image requirements of the application.
- Treat a parity indication as a memory-integrity fault.
Practical Questions
Why can a 1772-ME installation show less free program space than its nominal memory arrangement suggests?
The same memory resource also carries data-table words, I/O image information and message data. Review those allocations before deciding that the module itself has lost capacity.
Can 1772-ME be treated as a self-contained fixed-capacity module?
It is the segmented CMOS RAM member of the family, so capacity depends on the installed memory-segment arrangement. A fixed-capacity replacement should not be assumed from the ME prefix alone.
What does a parity fault mean for 1772-ME?
Parity checking is used to detect a memory-data error. Protect the running process, preserve available program information and investigate the module and its installation before returning the controller to service.
Which information should be backed up before replacing 1772-ME?
Back up the user program and the configuration that defines the data table, I/O image and message requirements. The replacement must be prepared for all of those stored areas, not only the ladder logic.
Where is 1772-ME installed in the PLC-2 hardware?
The module occupies one slot in the 1772-LA processor chassis. Power should be removed and the controller procedure followed before inserting or removing memory hardware.
How should a buyer specify 1772-ME when several PLC-2 memory types are present?
Provide the full 1772-ME catalog and the required memory-segment configuration. Do not shorten the request to a generic PLC-2 memory module because fixed-capacity core modules are different products.
Global Sourcing Service
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