Siemens Simatic S7-400 - Manual (Page 441)

CPUs for M7-400
11-13
S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
11.3.5 Memory Submodules Suitable for the Main Memory
Introduction
You must order the MEM 478 DRAM memory submodules for the main memory of
the CPUs separately. They are also shipped separately. These memory
submodules must be inserted before plugging into the mounting rack.
Main Memory Expansion
You can see from Table 11-6 which memory submodules you can use in which
CPU.
Table 11-6 Main Memory Expansion Possibilities
MEM478 DRAM Memory
Submodules
CPU 486-3 CPU 488-3
2 x 8 Mbytes, 3.3 V
• •
!
Warning
DRAM memory submodules can be damaged.
If you use memory submodules for the main memory other than the DRAM
submodules designed for the purpose, the submodules can be damaged.
Use only the MEM 478 DRAM memory submodules for the main memory.
Inserting the Memory Submodules
The sections “Installing an M7-400” and “Replacing Modules and Submodules” in
the User Manual explain how to insert or replace the memory submodules.