Allen-Bradley · PLC-3 Memory
Allen-Bradley 1775-MEA PLC-3 64K Memory Module
64K-word memory module for larger PLC-3 program and data-table requirements.
Product Overview
For PLC-3 applications in the 64K class, the 1775-MEA supplies 65,536 words of program and data storage.
The 1775-MEA is the corrected official catalog for the user's original MEAA entry; the additional final A is not part of the module number.
Selection should be based on the complete application image and the compatible 1775 processor-chassis arrangement, with sufficient capacity reserved for data and future controlled edits.
Technical Data
| Technical Item | 1775-MEA |
|---|---|
| Brand | Allen-Bradley |
| Product Type | PLC-3 Memory Module |
| Brand Country | United States |
| Controller Family | PLC-3 |
| Memory Capacity | 64K words |
| Exact Word Count | 65,536 words |
| Correct Catalog | 1775-MEA |
| Compatible Chassis Family | 1775-A1 / 1775-A2 / 1775-A3 |
| Larger Family Option | 1775-MED |
64K Program & Data Capacity
Application image
The 65,536-word resource supports a larger combined program and data-table layout.
Allocation review
Capacity estimates must include I/O images, status information and application data.
Controlled reserve
Document unused space so later changes can be assessed against a known margin.
Processor-Chassis Compatibility
For 1775-MEA, processor-chassis compatibility must be reviewed with the installed controller hardware and saved application rather than treated as an isolated catalog-number change.
- Record processor and chassis catalog numbers.
- Use the exact 1775-MEA catalog, not 1775-MEAA.
- Check memory recognition before loading the application.
Practical Questions
Is 1775-MEAA a valid alternate catalog for 1775-MEA?
No; the confirmed PLC-3 64K memory catalog is 1775-MEA. Keeping the extra final A can prevent an exact search or lead to an unverified quotation.
What is the exact capacity of 1775-MEA?
It provides 64K, equal to 65,536 words. Those words are shared by program and controller data requirements.
Can 1775-MEA be selected only because a program file is larger than 32K?
Review the complete memory image, processor and chassis before selecting it. File size alone may not represent the controller's actual word allocation or compatibility needs.
What should be checked before moving from 1775-ME8 to 1775-MEA?
Confirm that the processor system accepts the 64K member and that the restored application uses the intended addressing. Then test memory diagnostics and I/O behavior under controlled conditions.
Why should free capacity be documented on 1775-MEA?
A recorded reserve helps engineers judge whether later logic and data-table additions will fit. It also prevents an apparently large 64K module from being treated as unlimited.
Which processor chassis are associated with 1775-MEA?
The PLC-3 processor-chassis family includes 1775-A1, 1775-A2 and 1775-A3. Verify the actual installed system and memory position before replacement.
Multi-Brand Automation Supply
Moore Automation
One contact for mixed control-system requirements
A single maintenance request may involve PLC, DCS, HMI, drive, sensor and protection products from different brands. Moore Automation can combine this wider sourcing scope with exact model handling for each line item.
Mixed-brand coverage is useful when shutdown work depends on several unrelated components arriving through a coordinated commercial process.
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