Installation and EMC guidelines
1.17 ESD Directives
SIMATIC TDC hardware
System Manual, 08/2017, A5E01114865-AL
35
1.17
ESD Directives
Almost all of the SIMATIC TDC modules contain highly integrated components. Due to their
technology, these components are highly sensitive to overvoltage and, therefore, to ESD.
ESD
The abbreviation stands for electrostatic discharge
Modules equipped with such components are identified by the following warning label on
component side:
Electrostatic sensitive components can be destroyed by voltages and power levels far below
human perception. Components or modules are possibly exposed to such voltages when
touched by humans who have not been not electrostatically discharged. Following such
voltage peaks, it is usually impossible to identify malfunction of the component immediately,
as it needs an extended operating time before such malfunctions are disclosed.
Handling ESD modules
●
As a matter of principle, you should never touch electronic modules unless this is
unavoidable in the course of work to be carried out on the component.
●
Do not touch components unless
–
you are continuously grounded by means of an ESD bracelet, or
–
or by wearing ESD shoes, or ESD shoe grounding strips.
●
Always discharge your body before you touch an electronic module. This can be done
quite simply by touching a conductive, grounded object immediately before you handle
the component (e.g. bright metal parts of the control cabinet, water pipe etc.)
●
Modules may not come into contact with highly insulating materials that are subject to
electrostatic charge, e.g. plastic foils, insulating table plates, clothing made of artificial
fiber.
●
Modules must always be placed onto conductive surfaces (table with ESD mat,
conductive ESD foam rubber, ESD packaging bags, ESD transport containers, cardboard
or paper mats).
●
Modules may not be brought close to data terminals, monitors, or television sets.
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