Siemens Simatic S7-200 System Manual page 148

CPU Memory: Data Types and Addressing Modes
Restoring the Program and Memory with a Memory Cartridge
To transfer the program from a memory cartridge to the CPU, you must cycle the power to
the CPU with the memory cartridge installed. As shown in Figure 7-21, the CPU performs the
following tasks after a power cycle (when a memory cartridge is installed):
The RAM is cleared.
The contents of the memory cartridge are copied to the RAM.
The user program, the CPU configuration, and the V memory area (up to the maximum
size of the permanent V memory area) are copied to the permanent EEPROM.
Note
Powering on a CPU with a blank memory cartridge, or a memory cartridge that was
programmed in a different model number CPU, causes an error. Remove the memory
cartridge and power on again. The memory cartridge can then be inserted and
programmed.
RAM
User program
CPU configuration
V memory
M memory
Timer and counter
current values
Figure 7-21
7-18
User program
CPU configuration
V memory (up to the maximum size of
the permanent V memory area)
All other areas of
memory are set to 0.
User program
CPU configuration
V memory (permanent area)
Restoring Memory on Power On (with Memory Cartridge Installed)
EEPROM (Permanent)
User program
CPU configuration
V memory
(permanent area)
M memory
(permanent area)
Memory
Cartridge
S7-200 Programmable Controller System Manual
C79000-G7076-C230-02