Design And Function Of The Memory Cards; Figure 5-4 Design Of The Memory Card - Siemens SIMATIC S7-400H System Manual

5.5

Design and function of the memory cards

Order numbers
The order numbers for memory cards are listed in the technical specifications, see section
Technical data of memory cards (Page 431).
Design of a memory card
The memory card is slightly larger than a credit card and is protected by a strong metal
casing. It is inserted into one of the slots on the front of the CPU. The memory card is
designed so that it can only be inserted one way.
Figure 5-4
Function of the memory card
The memory card and an integrated memory area on the CPU together form the load
memory of the CPU. During operation, the load memory contains the complete user
program, including comments, symbols, and special additional information that enables
decompilation of the user program, as well as all module parameters.
Data stored on the memory card
The following data can be stored on the memory card:
● The user program, i.e. OBs, FBs, FCs, DBs, and system data
● Parameters that determine the behavior of the CPU
● Parameters that determine the behavior of I/O modules
● The full set of project files on suitable memory cards.
S7-400H
System Manual, 03/2012, A5E00267695-11
Design of the memory card
Assembly of a CPU 41x–H
5.5 Design and function of the memory cards
65