Esd Guidelines - Siemens simatic hmi op27 Equipment Manual

ESD Guidelines

What does ESD
Virtually all present-day modules incorporate highly integrated MOS devices
mean?
or components. For technological reasons, these electronic components are
very sensitive to overvoltages and consequently therefore to electrostatic dis-
charge:
These devices are referred to in German as Elektrostatisch Gefährdeten
Bauelemente/ Baugruppen: "EGB"
The more frequent international name is:
"ESD" (Electrostatic Sensitive Device)
The following symbol on plates on cabinets, mounting racks or packages
draws attention to the use of electrostatic sensitive devices and thus to the con-
tact sensitivity of the assemblies concerned:
ESDs may be destroyed by voltages and energies well below the perception
threshold of persons. Voltages of this kind occur as soon as a device or an as-
sembly is touched by a person who is not electrostatically discharged . Devices
exposed to such overvoltages cannot immediately be detected as defective in
the majority of cases since faulty behavior may occur only after a long period
of operation.
Precautions
Most plastics are capable of carrying high charges and it is therefore impera-
against electro-
tive that they be kept away from sensitive components.
static discharge
When handling electrostatic sensitive devices, make sure that persons, work-
places and packages are properly grounded.
OP27, OP37 Equipment Manual
Release 05/99
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