Siemens Simatic S7-300 CPU 31xC Series Installation And Operating Instructions Manual page 132

Commissioning
8.4 Commissioning the Modules
Inserting/replacing the Micro Memory Card (MMC)
1. Switch the CPU to STOP mode.
2. Is an MMC already inserted?
3. Insert the ("new") MMC into the MMC slot with the beveled edge of the MMC pointing
4. Gently insert the MMC into the CPU until the MMC clicks into place.
5. Reset CPU memory
Inserting and removing an MMC when CPU power is switched off
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
It automatically performs a CPU memory reset after POWER ON.
Reference
•
•
8-8
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, press the ejector and remove the MMC.
The module slot has an ejector device to enable you to remove the micro memory card
(see CPU 31xC and CPU 31x Manual, Technical Data
Elements
).
Use a small screwdriver or ball-point pen to remove the MMC.
towards the ejector.
(see Resetting CPU memory by means of mode selector switch)
C P U
Properties of the Micro Memory Card (MMC)
data
Technical Data of the Micro Memory Card (MMC)
Technical data
Operator Control and Display
, CPU 31xC and CPU 31x Manual, Technical
, CPU 31xC and CPU 31x Manual,
S7-300, CPU 31xC and CPU 31x: Installation
Operating Instructions, Edition 08/2004, A5E00105492-05