Name: GE Fanuc IC655MEM501 / IC655MEM503 Series Five RAM Memory Cartridges
Brand: GE
SKU: 2906109
Price: 1 USD
Availability: InStock

GE Fanuc IC655MEM501 / IC655MEM503 Series Five RAM Memory Cartridges Item NO.: 2906109

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Common ground first

Shared Role, Then Model Differences

IC655MEM501 / IC655MEM503

Battery-backed RAM cartridges providing 4K or 16K program memory and different register-expansion implications.

Shared technical scope

Both cartridges store Series Five user logic in battery-backed RAM and include a write-protect jumper. They differ in capacity and in the register-memory hardware supplied for the CPU.

Difference boundary

IC655MEM501 provides 4K RAM. IC655MEM503 provides 16K RAM and is supplied with a separate 16K register RAM that replaces the CPU’s standard 4K register device; the CPU register-size jumper must then be moved to EXPAND.

Verified technical data

Common Specifications and Model-Specific Data

Shared cartridge features

Memory typeBattery-backed RAM

InstallationRemovable CPU memory cartridge

ProtectionInternal WRITE UNPROTECTED / MEMORY PROTECT jumper

BatteryRetains contents only while backup is maintained

Service ruleDo not insert or remove with power applied

Capacity differences

IC655MEM5014K RAM program memory

IC655MEM50316K RAM program memory

Register memory with 501Standard 4K registers; 3999 available for general use

Register expansion with 503Separate 16K RAM installed in CPU

CPU jumper with 503Move to the 16K / EXPAND position

Functional position

Program Memory and Register Memory Are Separate Checks

Moving to the 16K cartridge does not finish the job. The CPU register RAM and its jumper must agree with the application’s register use.

IC655MEM501

Confirm 4K program and standard register arrangement.

IC655MEM503

Confirm 16K program plus fitted 16K register RAM.

Both

Verify battery, write protection and a controlled backup.

Controlled replacement

Records to Preserve Before Removal

Step 1

Create and verify a controlled program backup before opening the CPU.

Step 2

Record cartridge label, write-protect position, battery status and register size.

Step 3

Remove power before inserting the cartridge or changing register RAM.

Manual-driven decisions

Technical Questions

Which memory-cartridge characteristics link IC655MEM501 / IC655MEM503?

Both are battery-backed RAM memory cartridges for the Series Five CPU and include a write-protect jumper.

How do capacities differ for IC655MEM501 / IC655MEM503?

IC655MEM501 provides 4K RAM; IC655MEM503 provides 16K RAM.

What extra hardware accompanies IC655MEM503 within IC655MEM501 / IC655MEM503?

A separate 16K register RAM is supplied to replace the CPU’s standard 4K register device.

Which jumper checks apply to IC655MEM501 / IC655MEM503?

Check the cartridge write-protect jumper; with IC655MEM503 also confirm the CPU register-size jumper is set for 16K EXPAND.

Can IC655MEM501 / IC655MEM503 be removed while powered?

No. The manual warns against inserting or removing a memory cartridge with power applied.

How should IC655MEM501 / IC655MEM503 be accepted after installation?

Verify the program, memory indicators, battery condition, write-protect state and all application register ranges.

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Product Name	GE Fanuc IC655MEM501 / IC655MEM503 Series Five RAM Memory Cartridges
Item NO.	2906109
Weight	0.1 kg = 0.2205 lb = 3.5274 oz
Category	GE
Brand	GE
Creation Time	2026-09-07