SiemensSM 374
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How do I reset the S7-300 CPU and MMC?
How do I reset the S7-300 CPU and MMC?
SiemensSM 374
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Top answer
You need to know that all the data on the MMC will disappear.
- The MMC is slotted in the bay of the CPU. The CPU requests an overall reset (slow blinking of the STOP LED).
- Set the switch to "MRES" and hold it there until the STOP LED lights continuously (approx. 9 seconds).
- Within the next 3 seconds, you must let the switch go and set it back to "MRES". The STOP LED now blinks during the delete procedure.
If, after all, the CPU still requires a reset, the MMC is damaged.
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