QUESTION 4 : 31X型PLC插入MMC卡后，STOP灯不停闪烁，怎么办？ 或 如何格式化MMC？
Why does the STOP LED flash on my CPU 31xC when the MMC (Micro Memory Card) is slotted? The CPU does not behave like this with other MMCs.
ANSWER:
The MMC in your CPU is not formatted or contains data that cannot be interpreted by this CPU (e.g. the configuration of a different CPU type or an operating system not compatible with the CPU).
WARNING:
When you format the MMC all the data that is located on the MMC is deleted!
Proceed as follows to format the MMC.
1. Your CPU requests an overall reset (slow flashing of the STOP LED).
2. Put the switch into the MRES position and hold it there until the STOP LED lights permanently (approx. 9 seconds).
3. You must then release the switch within the next 3 seconds and then put it back into the MRES position. The STOP-LED now flashes during formatting.
If the MMC cannot be formatted as described above, then the MMC is defective.
NOTE:
It is only possible to format the MMC if there is data located on the MMC that is invalid for the CPU. Otherwise the MMC is only initialized through the steps described.
More information on the MMC is available in Entry ID: 8861901


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