Mitsubishi FX-EEPROM-4 – EEPROM Memory Cassette Card | MELSEC FX Series PLC
Engineering Background
The Mitsubishi Electric MELSEC FX series has been a cornerstone of compact PLC automation since the 1980s, deployed across millions of machine control applications worldwide. Reliable program retention is mission-critical in these environments — power interruptions, battery failures, or accidental overwrites can halt production lines and trigger costly downtime.
Product Positioning
The FX-EEPROM-4 is Mitsubishi Electric’s factory-designated EEPROM memory cassette for the MELSEC FX0, FX0S, FX0N, FX1, FX2, FX2C, and FX2N PLC families. It provides 4K-step non-volatile program storage without requiring a backup battery, making it the preferred solution for OEM machine builders and system integrators who demand zero-maintenance program retention in harsh industrial environments.
Complete Technical Specifications
| Part Number / SKU | FX-EEPROM-4 |
| Manufacturer | Mitsubishi Electric Corporation |
| Series / Platform | MELSEC FX Series |
| Memory Type | EEPROM (Electrically Erasable Programmable Read-Only Memory) |
| Program Capacity | 4,000 Steps (4K Steps) |
| Battery Backup Required | No — non-volatile, battery-free retention |
| Write Endurance | Approx. 10,000 write cycles |
| Data Retention | 10 years (at 25°C, without power) |
| Compatible PLCs | FX0, FX0S, FX0N, FX1, FX2, FX2C, FX2N |
| Form Factor | Plug-in cassette module |
| Operating Temperature | 0°C to +55°C |
| Storage Temperature | -25°C to +75°C |
| Country of Origin | Japan |
| Weight | Approx. 360 g (packaged) |
| Compliance | CE, UL, cUL |
Proven Application Environments
- OEM Machine Control — Permanent program storage for machines shipped to end-users without on-site programming capability
- Food & Beverage Processing — Battery-free retention eliminates maintenance intervals in hygiene-critical areas
- Textile & Packaging Machinery — Reliable program lock-in for high-cycle, continuous-duty equipment
- HVAC & Building Automation — Long-term data retention across seasonal power-down cycles
- Automotive Assembly Lines — Withstands vibration and temperature variation without data loss
- Retrofit & Spare Parts Programs — Drop-in replacement for aging FX-series installations requiring program preservation
Engineering Advantages
- Battery-Free Non-Volatile Storage — Eliminates battery replacement schedules and associated maintenance costs; program survives indefinite power loss
- OEM Factory Part — Guaranteed electrical and mechanical compatibility with all supported FX-series CPU modules; no firmware adaptation required
- Plug-and-Play Installation — Cassette-style form factor allows field installation without tools or special equipment
- 10-Year Data Retention — Exceeds typical machine lifecycle requirements; suitable for long-term archival of critical control programs
- Write-Protect Capability — Prevents accidental program overwrite in production environments
- Compact Footprint — Does not increase PLC panel space requirements
System Architecture & Signal Flow
The FX-EEPROM-4 interfaces directly with the FX-series CPU via the dedicated memory cassette slot located on the front face of the PLC base unit. During normal operation, the CPU reads the ladder program from the EEPROM cassette at power-on and executes it from internal RAM. On program write operations (via GX Developer or GX Works2 programming software), the CPU transfers the compiled program to the EEPROM over the internal bus. The EEPROM’s non-volatile cell array retains the bit pattern without power, ensuring program integrity across power cycles, brownouts, and extended storage periods.
Compatible Programming Software: GX Developer, GX Works2 (FX series project type)
Sourcing & Quality Verification
- All units sourced through authorized Mitsubishi Electric distribution channels or verified OEM surplus with full traceability
- Each unit undergoes incoming inspection: label verification, physical condition check, and functional read/write test where applicable
- Counterfeit screening performed on all FX-series memory modules prior to listing
- Original Mitsubishi Electric packaging preserved where available; repackaged units clearly identified
- Certificate of conformance available upon request for regulated industries
Procurement Process
- Confirm Compatibility — Verify your FX-series CPU model against the compatible PLC list above
- Request Quote — Contact support@konmask.com for volume pricing, lead time, and availability confirmation
- Place Order — Standard checkout via Konmask.com or purchase order accepted for qualified B2B accounts
- Shipping — Ships from Hong Kong; DHL Express, FedEx International, and EMS available; typical transit 3–7 business days worldwide
- Documentation — Commercial invoice, packing list, and HS code declaration provided with every shipment
Technical FAQ
Q: Can the FX-EEPROM-4 replace a battery-backed RAM cassette?
A: Yes. The FX-EEPROM-4 provides equivalent program retention without requiring a battery. Note that EEPROM has a finite write cycle limit (~10,000 cycles); for applications requiring frequent program updates, battery-backed RAM may be preferable.
Q: Is the FX-EEPROM-4 compatible with FX3U or FX5U PLCs?
A: No. The FX-EEPROM-4 is designed for the legacy FX0/FX1/FX2/FX2N families. FX3U and FX5U use different memory cassette formats (FX3U-FLROM-16 / SD card respectively).
Q: Can I read the program back from the cassette to a PC?
A: Yes, using GX Developer or GX Works2 with a compatible programming cable (SC-09 or USB-SC09-FX), you can upload the program from the cassette to your PC for backup or editing.
Q: What happens if I exceed the 10,000 write cycle limit?
A: Write errors or data corruption may occur. Mitsubishi recommends monitoring write cycle counts in high-frequency development environments and replacing the cassette proactively.
Q: Do you provide a warranty?
A: Yes. Konmask.com provides a 90-day functional warranty on all verified OEM parts. Contact support@konmask.com for warranty claims.
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