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IC655MEM501

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General Electric IC655MEM501 is a 4K RAM Memory Module for editable application storage in supported Series Five CPUs and program work with IC655APU500.
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Technical specifications for IC655MEM501

  • Manufacturer:
    General Electric
  • Part Number:
    IC655MEM501
  • Product Family:
    GE Intelligent Platforms
  • Product Type:
    4K RAM Memory Module
  • Stock:
    1
  • Memory Technology:
    Battery-backed CMOS RAM
  • CPU Program Capacity:
    4K
  • APU500 Program Capacity:
    24K
  • Data Retention:
    Dependent on host battery backup
  • Write Protection:
    Jumper selectable
  • Programming Method:
    Editable in compatible host
  • Compatible Host Roles:
    Series Five CPU or IC655APU500
  • Service Priority:
    Backup before removal or battery disturbance
  • Estimated shipping dimensions:
    7.2 × 5.1 × 1.3 cm
  • Tariff Code:
    8538900000
  • 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 Host Use RAM Retention Write Protection Module Exchange

Features:

  • Editable RAM supports controlled program development and commissioning.
  • Battery backup retains the installed image while the host support remains healthy.
  • A write-protect jumper helps secure a validated application.
IC655MEM501 is interpreted differently by a Series Five CPU and by IC655APU500, so capacity must be stated with the host role.

RAM offers convenient editing but requires disciplined backup. Battery support and write protection should be checked before maintenance.

The plug-in format simplifies replacement only when the correct program image and jumper state are available.

For General Electric IC655MEM501 4K RAM Memory Module pricing and official technical documentation, contact Apter Power.
GE Fanuc IC655MEM501 4K RAM 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.

How capacity changes with the installed host

  • Series Five CPU: The module provides a 4K editable program resource.
  • IC655APU500: The same option is used as 24K BASIC program memory.
  • Image format: A CPU application and BASIC program are not interchangeable.
  • Compatibility: Confirm the exact host before moving the module.

Protecting data held in battery-backed memory

  • Battery support: Retention depends on the host backup source.
  • Power-down work: Create a verified external copy before service.
  • Storage risk: Do not assume an unplugged RAM module preserves data indefinitely.
  • Recovery file: Keep the correct program and checksum with maintenance records.

Controlling changes to a validated program

  • Jumper state: A hardware selection enables or blocks writing.
  • Development: Allow edits only during controlled commissioning.
  • Production: Protect the verified image after approval.
  • Replacement: Copy the intended jumper state to the new installation.

Steps before restoring a replacement memory device

  • Identify host: Confirm whether the module serves a CPU or APU500.
  • Save program: Export and verify the existing application.
  • Inspect contacts: Check the connector and seating surfaces.
  • Reload and prove: Restore the image and validate operation before release.
Description
General Electric IC655MEM501 is a 4K RAM Memory Module for compatible Series Five CPUs and for program work with IC655APU500. The CPU addresses it as 4K of application storage, whereas the ASCII/BASIC module uses the same device as a 24K program-memory option.

Editable CMOS RAM makes IC655MEM501 suitable for development and controlled application changes. Its write-protect jumper should be recorded with the program release so a replacement neither blocks an intended update nor leaves a validated image unintentionally writable.

Program retention for IC655MEM501 depends on the battery arrangement in the host rather than on the plug-in memory alone. The application must be backed up and battery condition confirmed before power removal or relocation of the module.

Host role changes the interpreted capacity and program format of IC655MEM501. Moving it between a Series Five CPU and IC655APU500 therefore requires confirmation of the destination hardware, memory map, software image, and backup instead of assuming that a readable module contains the correct type of program.
Alternative Names
IC655-MEM501 IC655MEM-501 IC 655 MEM 501 GE Fanuc IC655MEM501 General Electric IC655MEM501 GE Fanuc Series Five IC655MEM501 IC655MEM501 4K RAM Memory Module 1C655MEM501
Technical notes
Back up IC655MEM501 before removal, then record its host module, write-protect jumper, program image, and battery condition.
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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.
Why must IC655MEM501 be backed up even though it is battery-backed?
When testing IC655MEM501, battery condition, handling, or loss of host backup power can erase RAM; retain an external verified copy before disturbing the module.
Why does IC655MEM501 show a different capacity in IC655APU500?
In service work involving IC655MEM501, the ASCII/BASIC module uses the memory device as a 24K program resource, whereas the compatible Series Five CPU addresses 4K for its program role.
What should be checked when a program cannot be changed in IC655MEM501?
Before returning IC655MEM501 to operation, inspect the write-protect jumper and host programming state before assuming the RAM has failed.
Can IC655MEM501 be moved directly from a CPU into an APU500?
While diagnosing IC655MEM501, do not assume interchangeability of the stored image; confirm host compatibility, memory format, and the intended application before moving the device.
Why may a replacement IC655MEM501 appear blank?
When commissioning IC655MEM501, a RAM module does not arrive with the site application; restore the correct backed-up image and verify host battery support.
What should be documented before removing IC655MEM501?
During an IC655MEM501 replacement review, record the host model, jumper position, software checksum or version, backup file, and battery condition.
How can accidental edits to a validated IC655MEM501 program be reduced?
At the IC655MEM501 field connection, after verification, apply the documented write-protect setting and control access to the authoritative backup.

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