Siemens 620 appendix What does ESD mean?, Definition

Guidelines for handling electrostatic

A.1 What does ESD mean?

Definition

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All electronic components are equipped with high–integrated modules or components. Conditioned by their technology, these electronic components are extremely sensitive to overvoltages and therefore to discharges of static electricity.

The short term ESD has been adopted for these Electrostatic Sensitive Devices/ assemblies.

Electrostatic sensitive assemblies are identified by the following symbol:

Caution

Electrostatic sensitive devices can be destroyed by voltages which are far below the limit of perception of human beings. These voltages occur when you touch a component or the electrical connections of a assembly without being electrostatically discharged. The damage which arises in a assembly as a result of overvoltage cannot usually be detected immediately, but only becomes apparent after a lengthy operating period.

A-2	SIMATIC Box PC 620 Manual
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