Siemens SIMATIC Rack PC 840 - Installing Memory Expansion Submodules

SIMATIC Rack PC 840 Expansions
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SIMATIC Rack PC 840 Manual
A5E00104826-03
4.2 Installing Memory Expansion Submodules
The motherboard has 3 slots for 144 pin SDRAM memory submodules. This allows
you to expand the memory capacity of your Rack PC to a maximum of
512 Mbytes.
Either one, two or three modules can be installed.
Memory Modules
64 Mbytes 128 Mbytes 256 Mbytes
64 Mbytes 1 – –
128 Mbytes 2 – –
128 Mbytes – 1 –
192 Mbytes 1 1 –
192 Mbytes 3 – –
256 Mbytes 2 1 –
256 Mbytes – 2 –
256 Mbytes – – 1
384 Mbytes – 1 1
384 Mbytes 2 – 1
512 Mbytes – – 2
512 Mbytes – 2 1
Memory expansion
Figure 4-4 Position of the SDRAM Memory Modules