Expanding The Working Memory Of The Cpu 417-4 H With Memory Modules; Memory Expansion; Fitting Memory Cards In The Cpu - Siemens SIMATIC S7-400H Manual

Installation of a CPU 41x-H
4.5.2 Expanding the Working Memory of the CPU 417-4 H with
Memory Modules

Memory Expansion

The working memory of the CPU 417-4 H can be expanded with memory modules.
The following points are important:
1. When only one module is used it has to be inserted 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:
Combination
1
2
3
4
Note
Only use memory modules designed for the 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
slot 1 (see Figure 4-4). 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 4-4).
5. Fit the cover on the upper left side of the CPU by securing it with three screws.
4-22
Slot 1
2 Mbytes
4 Mbytes
4 Mbytes
4 Mbytes
Automation System S7-400H Fault-tolerant Systems
Slot 2
–
–
2 Mbytes
4 Mbytes
o
into
A5E00068197-07