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.

可以格式化。不过首先是PLC认为MMC需要格式化，表现为STOP灯持续闪烁。
另外还需要按照上面的步骤操作，先保持9秒，然后松开后3秒内再次拨到MRES位置。