5 lines
4.0 KiB
Markdown
5 lines
4.0 KiB
Markdown
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| Hi H,<br><br>How do you format or reset an MMC (Micro Memory Card) for SIMATIC S7-300 CPUs?<br><br>**Instructions:** <br>It is not possible for users to format an MMC. All you can do is "reset" an MMC, which **deletes all user data**. Proceed as follows.<br><br>1. The MMC is slotted in the bay of the CPU. Your CPU requests an overall reset (slow blinking of the STOP LED).<br>2. Set the switch to MRES and hold it there (approx. 9 seconds) until the STOP LED lights continuously.<br>3. Within the next 3 seconds you must let the switch go and set it again to MRES. The STOP LED now blinks during the delete procedure.<br><br>If the MMC continues to request an overall reset after the procedure described above, then it is defective.<br><br>**Note:** <br>It is only possible to reset the MMC if it contains data that is invalid for the CPU. Otherwise the MMC is only initialized by the procedure described.<br><br>**So try it to delete all the data on the MMC in another (non Failsafe) CPU with the three points above.** |
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| I hope that the answer will help, if you have still questions, don't hesitate to ask me. <br> <br>All the best, Late <br>Never say never, think in solutions, not in trouble...... |
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