Siemens SIMATIC HMI USB Hub 4 Betriebsanleitung Seite 102

Appendix
A.1 ESD guidelines
Anyone who is not connected to the electrical potential of their surroundings is subjected to
electrostatic charge.
The figure indicates the maximum electrostatic charge anyone is subjected to when
contacting the materials shown. These values correspond with specifications to IEC 801-2.
Figure A-2
①
②
③
Protective measures against discharge of static electricity
CAUTION
Grounding measures
When working with electrostatic sensitive devices, make sure that the person, the
workplace and the packaging are properly grounded. This helps to avoid electrostatic
charge.
As a rule, only touch the ESD if this is unavoidable. Example: for maintenance. When you
touch modules, make sure that you do not touch the pins on the modules or the PCB tracks.
This prevents any discharge of static electricity to sensitive component and thus avoids
damage.
Discharge electrostatic electricity from your body if you are performing measurements on an
ESD. To do so, touch a grounded metallic object.
Always use grounded measuring instruments.
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Electrostatic voltages with which a person can be charged.
Synthetic materials
Wool
Antistatic materials such as wood or concrete
SIMATIC HMI Accessories
Operating Instructions, 09/2007, A5E00471973-02