Siemens S5-135U/155U Manual De Usuario
B-2
System Manual
C79000-G8576-C199-06
B.1
What is ESD?
All electronic modules are equipped with large-scale integrated ICs or
components. Due to their design, these electronic elements are very sensitive
to overvoltages and thus to any electrostatic discharge.
components. Due to their design, these electronic elements are very sensitive
to overvoltages and thus to any electrostatic discharge.
These Electrostatically- Sensitive Devices are commonly referred to by the
abbreviation ESD.
abbreviation ESD.
Electrostatically-sensitive devices are labeled with the following symbol:
!
Caution
Electrostatically-sensitive devices are subject to voltages that are far below the voltage
values that can still be perceived by human beings. These voltages are present if you
touch a component or the electrical connections of a module without previously being
electrostatically discharged. In most cases, the damage caused by an overvoltage is not
immediately noticeable and results in total damage only after a prolonged period of
operation.
values that can still be perceived by human beings. These voltages are present if you
touch a component or the electrical connections of a module without previously being
electrostatically discharged. In most cases, the damage caused by an overvoltage is not
immediately noticeable and results in total damage only after a prolonged period of
operation.
Definition
Guidelines for Handling Electrostatically-Sensitive Devices (ESD)