GE Fanuc IC655MEM521 Series Five 4K EEPROM Memory Cartridge
A removable CPU cartridge that combines electrically erasable program storage with the standard 4K Series Five register arrangement.
Electrically Erasable Storage at the CPU
IC655MEM521 is the 4K EEPROM cartridge listed for the GE Fanuc Series Five programmable controller. It stores the user logic program and I/O configuration in the removable cartridge installed behind the CPU's large hinged door, immediately beside the 8-pin OIU connector.
Unlike the UV-erasable EPROM variants, IC655MEM521 is electrically erasable. It belongs to the memory-cartridge group with a protection function, allowing stored information to be guarded against unintended writing when the cartridge protection arrangement is selected.
The CPU is supplied with 4K registers, with 3,999 available to the user for general use; that standard register arrangement remains associated with the 4K EEPROM selection.
IC655MEM521 Specifications
What IC655MEM521 Restores at Power-Up
IC655MEM521 cartridge
Series Five CPU
At every power-up, cartridge-held information is loaded into the CPU so the controller can reconstruct the saved program and operating configuration. Register data is separate and remains in the RAM device mounted on the CPU board.
Cartridge Size, Installation and Protection
Install only with power removed
Open the CPU's large hinged door, orient the PULL marking toward the top, and slide the cartridge into the guides until it firmly engages the connector at the rear of the slot.
Write protection affects store operations
Program and configuration information can be stored only when the cartridge is not write protected. A protected EEPROM can also trigger the nonblank/write-protection diagnostic during copy or erase work.
IC655MEM521 FAQ
Can IC655MEM521 be erased without ultraviolet equipment?
Yes. IC655MEM521 uses EEPROM and is electrically erasable. That is the core service difference from the IC655MEM512 and IC655MEM513 UV-erasable EPROM cartridges.
Why might IC655MEM521 reject a copy or erase operation?
First check the memory-protection state. The OIU's nonblank-cartridge diagnostic covers attempts to copy to or erase a protected RAM or EEPROM cartridge and directs the user to restore the unprotected position.
What must accompany an IC655MEM521 spare to reproduce the installed machine program?
Keep both the user program and the CPU configuration. The configuration record includes the I/O assignment map, I/O module map and watchdog setting, while the program record contains the user source and related program data.
Does IC655MEM521 require the 16K register-expansion procedure?
No. The manual associates IC655MEM521 with the standard 4K register arrangement. The separate 16K RAM replacement and EXPAND-jumper procedure is tied to the 16K memory selections, including IC655MEM513.
How should IC655MEM521 be replaced without damaging the cartridge or CPU?
Put the CPU in STOP, remove system power, pull the cartridge from the marked strip, and insert the replacement through the slot guides with PULL at the top. Do not insert or remove a cartridge while power is applied.
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