Structure of a CPU 41x
2.7 Structure and Functions of the Memory Cards
S7-400 Automation System, CPU Specifications
Manual, 10/2006, 6ES7498-8AA04-8BA0
2-17
2.7 Structure and Functions of the Memory Cards
Order numbers
The order numbers for memory cards are listed in the technical specifications.
Structure
The memory card is slightly larger than a credit card and protected by a strong metal casing.
It is inserted into a front slot of the CPU. The memory card casing is encoded to allow only
one position of insertion.
Front view Side view
Rating plate
Grip
Name of the Memory Card
Order number
Figure 2-4 Structure of the Memory Card
Function
The memory card and an integrated memory area on the CPU together form the load
memory of the CPU. During runtime, the load memory contains the complete user program
including comments, symbols and special additional information that allows the
decompilation of the user program, and all module parameters.
What Is Stored in the Memory Card
The following data can be stored on memory cards:
● User program, in other words, blocks (OBs, FBs, FCs, DBs) and system data
● Parameters which determine the behavior of the CPU
● Parameters which determine the behavior of the I/O modules.
● In STEP 7 V5.1 or higher, all project data on suitable Memory Cards.
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