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S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
A5E00105492-03
9-11
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1. Switch the CPU to STOP mode.
2. Is an MMC already inserted?
If yes, ensure that no write operations are running on the PG (such as loading a
block). If you cannot ensure this state, disconnect all communication lines of the
CPU.
Now, push in the ejector and remove the MMC.
To you to remove the micro memory card, the module slot has an ejector device
(see the &38'DWDReference Manual, figure in the chapter entitled (OHPHQWV
DQG$VVHPEO\RIWKH&38).
Use a small screwdriver or ball-point pen to remove the MMC.
3. Insert the ("new") MMC into the MMC slot with the bevelled edge of the MMC
pointing towards the ejector.
4. Gently insert the MMC into the CPU until the MMC clicks into place.
5. Reset the memory of the CPU VHH5HVHWWLQJ0HPRU\YLD0RGH6HOHFWRURI
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CPU
Figure 9-5 Insert the micro memory card into the CPU
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If you replace MMCs while the power is switched off, the CPUs
• will recognize a physically identical MMC with changed content
• a new MMC with the same content as the old MMC
After POWER ON, they request a memory reset.
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Refer also to the section on SIMATIC Micro Memory Card (MMC) in the CPU Data
Manual, Chapter &RQILJXUDWLRQDQG&RPPXQLFDWLRQ)XQFWLRQVRID&38[&.
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