Applicable Systems
S7-1200
S7-1500
S7-300
S7-400
LOGO!
SINAMICS
Symptoms
The SF LED turns red. The CPU detects an error with the installed SIMATIC memory card. The diagnostic buffer logs a memory card read or write failure.
Possible Causes
- Memory card is physically damaged or worn out
- Memory card was removed while the CPU was writing to it
- Memory card format is corrupted
- Incompatible or counterfeit memory card
Troubleshooting Steps
- Step 1: Power down the CPU and remove the memory card
Safe access to the card without risk of data corruption - Step 2: Inspect the memory card contacts for damage or contamination
Contacts are clean and undamaged - Step 3: Insert the memory card into a card reader and attempt to read it from a PC
Determine if the card is readable or has failed - Step 4: If the card is faulty, replace it with a genuine SIMATIC memory card and re-download the project
CPU recognizes the new card and operates normally
How to Reset
To reset: 1) Replace the faulty memory card with a new genuine SIMATIC memory card. 2. Re-download the hardware configuration and user program. 3. Power cycle the CPU. 4. Clear the diagnostic buffer. Caution: Only use genuine SIMATIC memory cards to ensure reliability and compatibility.
Common Replacement Parts
- 6ES7954-8LP02-00AA0: SIMATIC Memory Card 4MB (Use only genuine Siemens memory cards for guaranteed compatibility)
Frequently Asked Questions
- Q: Can I use a standard SD card instead of a SIMATIC memory card?
No, only genuine SIMATIC memory cards are compatible and reliable for S7-1500 CPUs. Standard SD cards may cause data corruption.
- Q: What happens if I remove the memory card while the CPU is running?
Removing the card during write operations can corrupt data and trigger this error. Always power down the CPU before removing the card.
Source: Siemens S7-1500 System Manual, Edition 08/2023
Category: PLC & VFD