Allen-Bradley · PLC-3 Memory
Allen-Bradley 1775-ME4 PLC-3 16K Memory Module
16K-word memory module for program and data storage in a compatible PLC-3 processor chassis.
Product Overview
With a capacity of 16K words, the 1775-ME4 is the smallest listed memory module in the PLC-3 memory group.
A PLC-3 processor chassis requires memory, and 1775-ME4 provides storage for the application program and the data-table structures used by the controller.
Capacity is stated as 16,384 words, so maintenance planning must compare the saved program and data allocation with that fixed boundary before selecting the module.
Technical Data
| Technical Item | 1775-ME4 |
|---|---|
| Brand | Allen-Bradley |
| Product Type | PLC-3 Memory Module |
| Brand Country | United States |
| Controller Family | PLC-3 |
| Memory Capacity | 16K words |
| Exact Word Count | 16,384 words |
| Compatible Chassis Family | 1775-A1 / 1775-A2 / 1775-A3 |
| System Requirement | One memory module in processor chassis |
| Larger Family Options | 1775-ME8 / 1775-MEA / 1775-MED |
16K Memory Organization
Program area
Controller instructions consume part of the 16,384-word resource.
Data-table area
I/O image, status and application values also require addressable words.
Fit decision
The saved application must be evaluated as a complete memory image before an ME4 is selected.
Chassis Integration
For 1775-ME4, chassis integration must be reviewed with the installed controller hardware and saved application rather than treated as an isolated catalog-number change.
- Remove chassis power before memory work.
- Confirm connector seating and module identity.
- Restore the program and verify processor diagnostics.
Practical Questions
Will every PLC-3 program fit in 1775-ME4?
No; the module provides 16,384 words shared by program and data requirements. Compare the full saved application with the available capacity before approving the module.
Can a PLC-3 processor chassis run normally without 1775-ME4 or another memory module?
The processor chassis requires a compatible memory module for program and data storage. Select the capacity that fits the application rather than operating without system memory.
What should be saved before replacing 1775-ME4?
Back up the application and document its data-table and I/O allocation. Those records are needed to restore the controller and confirm that the 16K image is complete.
How is 1775-ME4 different from 1775-ME8?
ME4 is the 16K, 16,384-word member, while ME8 provides 32K, 32,768 words. The larger catalog should only be chosen after processor-chassis and application compatibility are reviewed.
Which chassis family is associated with 1775-ME4?
The PLC-3 processor chassis family includes 1775-A1, 1775-A2 and 1775-A3. Check the actual system configuration and module position before hardware work.
What confirms a successful 1775-ME4 installation?
The processor should recognize memory without diagnostic errors and accept the restored application. I/O scanning and controlled outputs must also be verified before production resumes.
International Delivery
Moore Automation
Packed and tracked for the destination site
Orders are prepared with protective packaging suited to industrial automation components. Moore Automation can coordinate established international carriers and provide tracking information once the shipment is dispatched.
The delivery record remains connected to the quoted catalog and quantity, helping receiving teams reconcile the package with the original requirement.
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