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1775-ME4

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Allen-Bradley 1775-ME4 is a PLC-3 error-detecting-and-correcting memory module providing 16K, or 16,384 words, of controller memory.
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Technical specifications for 1775-ME4

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1775-ME4
  • Product Family:
    PLC-3
  • Product Type:
    PLC-3 16K EDC Memory Module
  • Stock:
    1
  • Product Family:
    PLC-3
  • Module Type:
    Error-detecting-and-correcting memory module
  • Memory Capacity:
    16K / 16,384 words
  • Single-Module Position:
    Thumbwheel 1
  • Multiple-Module Rule:
    Consecutive positions beginning at 1
  • Tariff Code:
    Please confirm the destination before shipping
  • Country of origin:
    USA
  • Place of shipment:
    Xiamen,Fujian,China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Project Fit Module Addressing Chassis Handling Product Applications

Features:

  • 16K PLC-3 memory capacity
  • Error-detecting-and-correcting storage
  • Consecutive thumbwheel addressing
Allen-Bradley 1775-ME4 contributes 16,384 words to the memory available in a PLC-3 processor chassis.

Its EDC role is storage for the ladder program and controller data, separate from the CPU and I/O-scanner functions.

Position 1 is the starting point for both a single-board installation and the ordered address sequence of a multi-board set.

Apter Power can assist with 1775-ME4 capacity records, label review, official literature, and quotation coordination.
1775-ME4 PLC-3 16K EDC Memory Module Manuals, Datasheets, Links Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
  • The documented capacity is 16K, equal to 16,384 words of PLC-3 memory.
  • Program and data demand must both fit the available tier before the board is selected.
  • Expected project growth belongs in the memory plan rather than being left for the outage team to infer.
  • Use thumbwheel position 1 when the controller has one memory module.
  • Keep positions consecutive from 1 when the chassis contains several memory boards.
  • Photograph the sequence before removal so the original order can be restored without guesswork.
  • Remove processor-chassis power before inserting or removing the memory board.
  • Guide the module through the upper and lower plastic tracks without forcing its card edge.
  • Secure the chassis latch before the controller is returned to service.
  • Stores PLC-3 programs whose confirmed demand fits the 16K memory tier.
  • Holds controller data used by an installed modular PLC-3 system.
  • Supports planned repair of a documented PLC-3 memory configuration.
Description
For a PLC-3 project that fits the 16K tier, 1775-ME4 provides 16,384 words of Allen-Bradley error-detecting-and-correcting memory. It stores controller program and data inside the processor chassis but does not execute logic or scan I/O.

The address of 1775-ME4 comes from its place in the memory set. A single board uses position 1; when several memory modules are fitted, their thumbwheel positions continue consecutively from 1 so the processor can interpret the installed order.

Before 1775-ME4 is disturbed, the saved project should open successfully and the module order should be photographed. If the application no longer fits 16K, the next step is an engineered memory review, not an assumption that a larger board will behave as a transparent substitute.
Alternative Names
Allen-Bradley 1775 ME4 16K Memory Rockwell 1775ME4 PLC-3 Memory PLC-3 16K EDC Memory Module
Technical notes
An unreadable backup is the highest service risk for 1775-ME4 because the board holds PLC-3 program and data. Open the archive before shutdown, photograph the slot and thumbwheel order, isolate chassis power, and postpone removal if the project cannot be restored or the installed memory sequence cannot be reconstructed with confidence.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
Is 1775-ME4 suitable when the archived project is larger than 16K?
No. Compare the complete program and data requirement with 16,384 words. If it does not fit, revise the supported memory architecture before ordering another catalog.
How do I preserve the thumbwheel address of 1775-ME4 during repair?
Photograph the board order and every thumbwheel before removal. Reinstall the set consecutively from position 1 and do not start the processor while any address remains uncertain.
What should I do if 1775-ME4 does not slide smoothly into the chassis?
Stop and inspect the upper and lower guide tracks rather than forcing the board. Correct the alignment with power isolated, then make sure the latch secures the module.
Can a higher-capacity PLC-3 board replace 1775-ME4 without project changes?
Do not assume that it can. A capacity change needs processor support, an approved memory layout, a restorable project, and a revised hardware record before installation.
Why does the physical order around 1775-ME4 matter after service?
The PLC-3 memory set uses consecutive thumbwheel positions beginning at 1. Changing the order without updating the configuration record can leave the installed memory map different from the restoration plan.
What should I send with an enquiry for 1775-ME4?
Include the full catalog label, confirmed 16K requirement, processor-chassis identity, current module order, and clear board and connector photographs. These details help match the spare to the actual installation.