Siemens SIMATIC PC RI25/45 Technical Description page 10

System Unit
Before Opening
The following rules are mandatory when carrying out any work on the open
the Unit unit, and should be read carefully before opening the unit:
Tools
Use a suitable Philips or Torx screwdriver to remove or install components.
1-6
Before you disconnect the power supply cable, discharge any electrostatic
charge on your body. You can do this by touching metallic parts, such as
screws, on the rear panel of the PC.
Discharge any electrostatic charge from tools that you are using.
Wear a grounding wrist strap if you are handling components.
Leave components and modules in their packing until you are ready to
install them.
Disconnect the PC from its power supply before plugging in or removing
any modules or components.
Touch components and modules only on their edges. Above all, do not
touch the connecting pins and printed conductors.
Do not operate the PC with the cover open.
SIMATIC PC RI25/45, Technical Description
C79000-G7076-C808-01