Siemens SIMATIC Rack PC 840 Manual page 56

SIMATIC Rack PC 840 Expansions
Caution
The electronic components of the printed circuit boards are extremely sensitive to
electrostatic discharge. Certain precautionary measures are therefore necessary
when handling such components. These measures are explained in the guidelines
for handling electrostatically sensitive devices (ESD) in Appendix A.
Installing the SDRAM Cards
To plug in expansion submodules, proceed as follows:
1. Open the unit as described in Section 4.1.
2. Plug the cards into the slots. Note the safety recess on the connector side of
the SDRAM card.
3. Push the card down applying light pressure until it locks into place.
4. Close the unit.
Caution
Make sure that the cards sit securely in the slots, otherwise they can fall out and
be damaged.
Installation
The memory configuration is detected automatically. When you switch on the unit,
the distribution of base and extended memory is displayed on the screen.
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SIMATIC Rack PC 840 Manual
A5E00104826-03