Q: The S7-300 CPU is powered. The stop light flashes once every 1.5 seconds. It keeps flashing and the CPU can't start. The CP module stop light is always on, the run light flashes once in about 1 second, the network cable is plugged in, the CP light is not on, and the CP is not connected, so you can save the prawn!
A: Regardless of the status, if the STOP light is flashing slowly, the CPU cannot be accessed because the CPU is requesting a reset. And the error is "Cannot find other active partners", which means that there is invalid data in your MMC that needs to be formatted. It is also possible to format the MMC on the CPU only when the STOP light is flashing slowly.
The 1.5DC lamp is always on, not flashing. If the flashing is not normal, check if the 24V power supply is connected properly, and enough 24V voltage.
2. STOP light, when your Rrun/Stop switch hits Stop, it should be always on, not flashing. When it hits Run, it should be flashing until it is always on.
If the Stop light flashes while the Run is still running and the Stop light flashes during the Stop, there is a problem. If other lights (excluding the 5DC light) do not flash or light up, it means that there is a problem with the CPU's MMC card. What you want to confirm at this point is:
A. Is there an MMC card inserted in the MMC slot of the CPU?
B.MMC card has directionality, please pay attention to insert and insert in place. Note: If you want to re-plug, you must turn off the power of the CPU, otherwise the MMC card will be damaged.
C. Is that you have plugged in the MMC card with power, if any, the MMC card is very easy to damage.
D. Is there any MMC card reader (non-Siemens-only) formatted on the PC, if any, this card can not be recognized by the CPU, you need to use the Siemens-specific card reader to format.
E. That is the problem with the MMC card itself. If you can, you can try another MMC card!
1. Turn the mode switch to the MRES position and hold it until the STOP light turns solid (about 9 seconds).
2. After the light is on, the switch must be released back to the STOP position within 3 seconds and the switch will be hit to the MRES position again. At this time, the STOP light will flash quickly, and the MMC is being formatted. When the STOP light changes from flash to steady light, the MMC format is completed, the switch is switched to RUN, and the CPU should be able to run.
If the above steps are correctly performed, the STOP light still flashes slowly, indicating that the MMC is damaged and needs to be replaced.
Note that you must not use a non-Siemens card reader to format the MMC or the MMC will no longer be available! !
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