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4.0 KiB
| Hi H, How do you format or reset an MMC (Micro Memory Card) for SIMATIC S7-300 CPUs? Instructions: 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. 1. The MMC is slotted in the bay of the CPU. Your CPU requests an overall reset (slow blinking of the STOP LED). 2. Set the switch to MRES and hold it there (approx. 9 seconds) until the STOP LED lights continuously. 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. If the MMC continues to request an overall reset after the procedure described above, then it is defective. Note: 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. So try it to delete all the data on the MMC in another (non Failsafe) CPU with the three points above. |
| I hope that the answer will help, if you have still questions, don't hesitate to ask me. All the best, Late Never say never, think in solutions, not in trouble...... |