Siemens CPU 313C Hardware And Installation Manual page 128

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• Module type of MMC is not a user module.
• MMC has not yet been formatted.
• MMC is defective.
• Content of MMC is invalid.
The content of the MCC was identified as invalid.
• The /RDG XVHU SURJUDP operation was aborted by a power OFF.
• The 3URPPLQJ operation was aborted by a power OFF.
• Error during evaluation of module content during memory reset.
• Error during formatting, or formatting could not be performed.
If one of these errors has occurred, the CPU prompts you for another memory
reset after a memory reset operation has been performed. The card content is
retained until the MMC is formatted, except when the Load user program or
promming operations are interrupted by a power OFF.
The MMC is only formatted if a reason for formatting exists (see above) and not, for
example, when you are prompted for a memory reset after a module replacement.
In this case, a switch to MRES triggers a normal memory reset for which the
module content remains valid..
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If the CPU is prompting you for a memory reset (slow flashing of STOP LED),
format the MMC using the following switch inputs:
1. Turn the switch to MRES position and hold it there until illumination of the STOP
LED is steady (about 9 seconds).
2. Release the switch within the next 3 seconds and then turn it to MRES position
again. The STOP-LED now flashes during the formatting.
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Make sure to perform the steps in the specified time. Otherwise, the MMS will not
be formatted and will instead return to the memory reset prompt state.
9-16
S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
A5E00105492-03