Esd Guidelines - Siemens SIMATIC HMI IPC577C Operating Instructions Manual

Burn-in effect on TFT displays
A permanent picture with bright images can lead to a burn-in effect on the TFT LCD.
If a screen saver is activated, please observe the following:
● The liquid crystals in screen savers which actuate active black when the backlighting is
● The following applies to screen savers that turn off the backlighting: Each time the
Consider the following carefully:
● Screen saver
● Switch off the backlighting regularly
● Permanent display of the customer application
2.3

ESD guidelines

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 designation for electrostatic sensitive components and
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. This rating label is described in chapter
Application planning (Page 29).
SIMATIC HMI IPC577C
Operating Instructions, 10/2010, A5E02368074-02
on, for example, "starfield simulation," renew themselves. Pay attention to the length of
time the backlighting is activated
backlighting is turned on, its life is reduced by 50 minutes.
modules.
Safety
2.3 ESD guidelines
15