6ES7951-0KF00-0AA0 SIMATIC S7 Memory Card
The Siemens SIMATIC S7 6ES7951-0KF00-0AA0 is a Flash EPROM memory card designed for use with SIMATIC S7-300 programmable logic controllers. It belongs to the SIMATIC S7 memory card family and serves as a load memory module, storing the user program, data blocks, and configuration data for the CPU. The card plugs directly into the designated memory card slot on compatible S7-300 CPU modules.
The 6ES7951-0KF00-0AA0 is a 64 KB Flash EPROM card, providing non-volatile storage that retains data without a backup battery. The card supports the standard SIMATIC S7 memory card interface and is compatible with a range of S7-300 CPUs that accept this card form factor. Data written to the card is retained even when power is removed, making it suitable for reliable program storage in industrial environments.
This memory card is widely used in manufacturing automation, process control, and machine tool applications where S7-300 PLCs are deployed. It is particularly suited for applications requiring reliable, battery-free program retention, such as conveyor systems, packaging machinery, and process plant control panels. The card also facilitates easy program transfer and CPU replacement in the field without requiring a programming device.
Technical Specifications
| Memory Type | Flash EPROM |
|---|---|
| Memory Capacity | 64 KB |
| Series/Product Family | SIMATIC S7-300 |
| Interface | SIMATIC S7 memory card slot |
| Data Retention | Non-volatile (no backup battery required) |
| Operating Temperature | 0 °C to +60 °C |
| Storage Temperature | -40 °C to +85 °C |
| Mounting | Direct plug-in to CPU memory card slot |
| Certifications | CE, UL |
| Form Factor | SIMATIC S7 memory card (plug-in module) |
Common Diagnostic Codes
- Fault Code 1
- Memory card not recognized by CPU
Remove and re-insert the memory card. Verify the card is fully seated in the slot. Check for physical damage to the card contacts. - Fault Code 2
- Memory card write error during program download
Ensure the memory card is not write-protected. Try erasing the card using STEP 7 before re-downloading the program. - Fault Code 3
- Program on memory card incompatible with CPU type
Verify the program was compiled for the correct CPU type and firmware version. Re-download the correct program using STEP 7. - Fault Code 4
- Memory card capacity exceeded
Check the size of the user program and data blocks. Reduce program size or use a higher-capacity memory card. - Fault Code 5
- Memory card read error during CPU startup
Replace the memory card. If the error persists, check the CPU memory card slot for damage or contamination. - Fault Code 6
- Memory card erase failure
Attempt the erase operation again using STEP 7. If the card cannot be erased, it may be faulty and should be replaced.
Frequently Asked Questions
Which S7-300 CPUs are compatible with the 6ES7951-0KF00-0AA0 memory card?
The 6ES7951-0KF00-0AA0 is compatible with S7-300 CPUs that accept the standard SIMATIC S7 Flash EPROM memory card format. Refer to the specific CPU manual to confirm memory card compatibility before installation.
Does the 6ES7951-0KF00-0AA0 require a backup battery to retain data?
No, this Flash EPROM memory card retains data without a backup battery. Data is stored non-volatilely and is preserved even when power is removed from the system.
Can the 6ES7951-0KF00-0AA0 be erased and reprogrammed?
Yes, the card can be erased and reprogrammed using the STEP 7 programming software. The erase and write operations are performed via the CPU with the card inserted in the memory card slot.
What is the storage capacity of the 6ES7951-0KF00-0AA0?
The 6ES7951-0KF00-0AA0 provides 64 KB of Flash EPROM storage for user programs, data blocks, and configuration data.
Can this memory card be used to transfer programs between CPUs?
Yes, the memory card can be used to transfer programs from one S7-300 CPU to another compatible CPU, enabling field replacement and program deployment without a programming device.
Troubleshooting
CPU does not recognize the memory card after insertion
Check that the card is fully and correctly seated in the memory card slot. Inspect the card edge contacts for contamination or physical damage.
Clean the card contacts with isopropyl alcohol and re-insert the card firmly. If the CPU still does not recognize the card, test with a known-good card to determine whether the fault lies with the card or the CPU slot.
Program download to memory card fails in STEP 7
Verify the card is not write-protected and that the correct CPU is online. Check available card capacity against the program size.
Erase the memory card using the STEP 7 'Delete' function before attempting a new download. Ensure the program size does not exceed 64 KB.
CPU enters STOP mode immediately after startup with memory card inserted
The program stored on the memory card may be incompatible with the CPU firmware version, or the card data may be corrupted.
Erase the memory card and re-download the correct program using STEP 7. Verify the program is compiled for the correct CPU type and firmware version.
Memory card cannot be erased using STEP 7
The card may have reached its write/erase cycle limit or may be physically damaged. Check STEP 7 diagnostics for specific error messages during the erase operation.
Replace the memory card with a new 6ES7951-0KF00-0AA0 or equivalent. Flash EPROM cards have a finite number of erase cycles and may need replacement after extended use.
Data on memory card is lost after power cycle
Flash EPROM cards should retain data without power. If data is lost, the card may be faulty or the write operation during download may not have completed successfully.
Re-download the program to the card and confirm successful completion in STEP 7. If data loss persists, replace the memory card.
| Condition | Repair, Used, Refurbished, New in box (sealed) |
|---|