Siemens SIMATIC PANEL PC 877 Operations Instructions download pdf (Page 15)

Safety

1.3 ESD directives

SIMATIC IPC677C

Operating Instructions, 05/2010, A5E02722710-01

1.3 ESD directives

What does ESD mean?

Almost all electronic modules are equipped with highly integrated components and elements

in MOS technology. For technological reasons, these electronic components are very

sensitive to overvoltages and, consequently, to electrostatic discharge. These components

are therefore marked as follows:

● ESD: Electrostatically Sensitive Devices

● ESD: Internationally recognized marking for components and modules susceptible to

electrostatic discharge

The following symbols on switch cabinets, module carriers or packaging indicate their

susceptibility to electrostatic discharge:

ESD components are destroyed by voltage and energy far below the limits of human

perception. Voltages of this kind occur as soon as a device or an assembly is touched by a

person who is not electrostatically discharged ESD components which were subject to such

voltage are usually not recognized immediately as being defective, because the malfunction

does not occur until after a longer period of operation.

Note

More information is located on the rating label. The rating label is described in the chapter

"Planning use."

Precautions against electrostatic discharge

Most plastics can be charged easily. Therefore, keep plastics away from ESD components!

When working with electrostatically sensitive components, make sure that the person, the

workstation and the packaging are properly grounded. Conduct the electrostatic charge

away from your body by touching the mounting plate for the interfaces, for example.

Handling ESD modules

As a rule: Only touch ESD components if unavoidable due to necessary tasks.

Only touch the components when the following holds true:

● You are permanently grounded by means of an ESD armband.

● You are wearing ESD shoes or ESD shoes grounding protective strips in connection with

ESD floors.

Before you touch an electronic assembly, your body must be discharged. Touch a

conductive object immediately beforehand, e.g. a bare metal part of a switch cabinet or the

water pipe.

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Siemens SIMATIC PANEL PC 877 Operations Instructions Page 15