Siemens SIMATIC Rack PC 840 V2 Operating Instructions Manual page 156

ESD Guidelines
18.1 ESD Guidelines
Electrical charge
Anyone who is not connected to the electrical potential of their surroundings can be
electrostatically charged.
The figure below shows the maximum electrostatic voltages that can accumulate in a person
who is operating equipment when he/she comes into contact with the materials indicated.
These values correspond with specifications to IEC 801-2.
Figure 18-1
Basic protective measures against discharge of static electricity
• Ensure good equipotential bonding:
•
18-2
Electrostatic voltages on an operator
When handling electrostatic sensitive devices, ensure that your body, the workplace and
packaging are grounded. This helps you avoid static charge.
As a general rule, only touch electrostatic sensitive devices when this is unavoidable
(e.g. during maintenance work). When you touch modules, make sure that you do not
touch either the pins on the modules or the printed conductors. This prevents any
discharge of static electricity to sensitive component and thus avoids damage.
Discharge electrostatic energy from your body before you perform measurements on a
module. To do so, touch a grounded metallic object. Always use grounded measuring
instruments.
Operating Instructions, Edition 05/2006, A5E00248055-04
SIMATIC Rack PC 840 V2