Siemens SIMATIC IPC627C Instructions d'exploitation télécharger pdf (Page 187)

SIMATIC IPC627C

Operating Instructions, 11/2010, A5E02669068-02

187

ESD guidelines

Definition of ESD

All electronic modules are equipped with large-scale integrated ICs or components. Due to

their design, these electronic elements are highly sensitive to overvoltage, and thus to any

electrostatic discharge.

The electrostatic sensitive components/modules are commonly referred to as ESD devices.

This is also the international abbreviation for such devices.

ESD modules are identified by the following symbol:

CAUTION

ESD devices can be destroyed by voltages well below the threshold of human perception.

These static voltages develop when you touch a component or electrical connection of a

device without having drained the static charges present on your body. The electrostatic

discharge current may lead to latent failure of a module, that is, this damage may not be

significant immediately, but in operation may cause malfunction.

Electrostatic charging

Anyone who is not connected to the electrical potential of their surroundings can be

electrostatically charged.

The figure below shows the maximum electrostatic voltage which may build up on a person

coming into contact with the materials indicated. These values correspond to IEC 801-2

specifications.

1 2 ... 182 183 184 185 186 187 188 189 190 191 192 ... 209 210

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Siemens SIMATIC IPC627C Instructions d'exploitation Page 187