Installing the S7-400
2-31
S7-400 and M7-400 Programmable Controllers Hardware and Installation
A5E00069481-04
2.13
Fitting Memory Cards in the CPU
Memory Expansion
With the CPU 417-4 and CPU 417-4 H you can expand the work memory with
memory submodules.
The following points are important:
1. If only one submodule is inserted, l must be in slot 1.
2. You may only insert a second submodule if a 4 Mbyte-submodule is inserted in
slot 1.
The following combinations are then possible:
Slot 1
Slot 2
2 Mbytes
-
4 Mbytes
-
4 Mbytes
2 Mbytes
4 Mbytes
4 Mbytes
Note
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
Proceed as follows:
1. Remove the cover from the left side of the CPU by loosening the three screws.
2. Push the first memory card down through an angle of approximately 45
o
into
slot 1 (see Figure 2-3). Note the cutout at the front of the card (polarity reversal
protection).
3. Push the memory card down until the tabs in the slot slide into the
corresponding cutouts on the side of the card. Make sure that the metal flag at
the end of the card lies on the metal edge of the module.
4. If necessary, insert the second memory card in slot 2 in the same way (see
Figure 2-3).
