Allen-Bradley · PLC-3 Memory
Allen-Bradley 1775-ME8 PLC-3 32K Memory Module
32K-word PLC-3 memory for applications that exceed the 16K capacity class.
Product Overview
Positioned above the 16K option, the 1775-ME8 provides 32K words of memory for a PLC-3 processor chassis.
The exact capacity is 32,768 words, shared by the controller program and its data-table organization rather than reserved entirely for instructions.
The 1775-ME8 catalog must stay distinct from similarly named PLC-2 memory products because its system role and chassis relationships belong to PLC-3 architecture.
Technical Data
| Technical Item | 1775-ME8 |
|---|---|
| Brand | Allen-Bradley |
| Product Type | PLC-3 Memory Module |
| Brand Country | United States |
| Controller Family | PLC-3 |
| Memory Capacity | 32K words |
| Exact Word Count | 32,768 words |
| Compatible Chassis Family | 1775-A1 / 1775-A2 / 1775-A3 |
| Smaller Family Option | 1775-ME4 |
| Larger Family Options | 1775-MEA / 1775-MED |
32K Application Capacity
Logic allowance
The expanded capacity supports more controller instructions than the 16K member when other allocations remain comparable.
Operating data
Data tables and I/O-related words remain part of the same 32,768-word limit.
Growth margin
Leave documented free space for tested maintenance changes instead of filling the module to its practical boundary.
Memory Addressing
For 1775-ME8, memory addressing must be reviewed with the installed controller hardware and saved application rather than treated as an isolated catalog-number change.
- Export or document the complete memory image.
- Check that the target module provides 32K capacity.
- Validate addresses and I/O after restoration.
Practical Questions
How many words does 1775-ME8 provide?
The rated capacity is 32K, equal to 32,768 words. Program instructions and controller data both draw from that resource.
Why can a 1775-ME8 application run out of memory before 32,768 instructions?
The word count is not an instruction-only allowance. Data tables, I/O image information and other controller structures reduce the space left for program logic.
Can 1775-ME8 be substituted for a PLC-2 memory module with a similar name?
No; this catalog belongs to the PLC-3 memory family and its chassis relationship is different. Match the complete catalog and controller architecture.
What data should accompany a request for 1775-ME8?
Provide the target PLC-3 chassis, processor catalog and the size of the saved application. Include the visible module revision when a like-for-like maintenance replacement is required.
What is the main risk when restoring a program to 1775-ME8?
An incorrect data-table boundary or incomplete image can leave addresses unresolved or shift controller behavior. Verify the saved layout and compare the restored controller status before enabling outputs.
When should 1775-MEA be considered instead of 1775-ME8?
Consider the 64K family member when the complete application and planned growth exceed 32,768 words. Confirm processor and system compatibility before moving to the larger capacity.
Maintenance Spares Planning
Moore Automation
Build a clearer reserve for critical installed assets
Moore Automation supports buyers assembling planned spare holdings for mature control platforms. Requests can include several exact processor, memory and communication catalogs without collapsing them into a generic family description.
The result is a more usable quotation for engineering review and a cleaner purchasing trail for future maintenance work.
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