E-2
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
E.1 What is ESD?
Definition
All electronic modules are equipped with large-scale integrated ICs or components.
Due to their design, these electronic elements are very sensitive to overvoltages
and thus to any electrostatic discharge.
The abbreviation ESD has been introduced for these Electrostatic Sensitive
Devices/Modules. The designation ESD is used internationally for electrostatic
sensitive device.
Electrostatic sensitive devices are labeled with the following symbol:
!
Caution
Electrostatic sensitive devices are subject to voltages that are far below the
voltage values that can still be perceived by human beings. These voltages are
present if you touch a component or the electrical connections of a module without
previously being electrostatically discharged. In most cases, the damage caused
by an overvoltage is not immediately noticeable and results in total damage only
after a prolonged period of operation.
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