Fitting Memory Cards In The Cpu - Siemens S7-400 Installation Manual

8.4.3

Fitting Memory Cards in the CPU

Introduction
For the CPUs of the M7-400 automation computer, the MEM 478 memory cards
are supplied separately. Before the module with its expansion modules is inserted
in the rack, the memory cards must be fitted.
Note
With a CPU, a DRAM memory card of the same size must be inserted at Slot 1
and Slot 2.
Only use the memory cards intended for the particular CPU.
Warning
!
The modules can be damaged.
Failure to observe ESD guidelines can result in damage to both the CPU and
memory cards.
Observe the ESD guidelines when fitting memory cards.
Fitting Memory Cards in the CPU
To install a memory submodule in a slot on the central rack, proceed as follows:
1. Remove the cover from the upper left side of the CPU by loosening the three
screws.
2. Insert the first DRAM memory card of the required size at an angle of about 45°
into Slot 1 as far as it will go (see Figure 8-1).
3. Press the protruding side of the DRAM memory card toward the PCB until the
memory card engages with the two lateral retaining springs (see Figure 8-1).
4. Insert the second DRAM memory card of the same size in the same way into
Slot 2 (see Figure 8-1).
5. Fit the cover on the upper left side of the CPU by securing it with three screws.
Note
The connectors to accept the memory cards are coded (see Figure 8-2).
Do not apply force when fitting the memory cards.
S7-400 and M7-400 Programmable Controllers Hardware and Installation
A5E00069481-04
Assembling the M7-400
8-11