Siemens SICLOCK TC 400 - Manual (Page 119)

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SICLOCK
® TC 400
ESD Guidelines
B
B.1 Electrostatic sensitive devices
Definition
All electronic modules are equipped with large-scale integrated ICs or compo-
nents. Because of the technology used, these electronic components are very
sensitive to overvoltages and thus to discharge of static electricity.
The acronym ESD has become the established designation for such Electrostatic
Sensitive Devices. This is also the international abbreviation for such devices.
Electrostatic sensitive devices are identified by the following symbol:
Figure B-1 Electrostatic sensitive devices
Caution
Electrostatic sensitive devices can be irreparably damaged by voltages that are
far lower than anything a person can perceive. These voltages occur if you touch
a component or the electrical connection of a module without having previously
discharged any static from your body. Any damage that occurs to a module as a
result of overvoltage is generally not recognized immediately and only comes to
light after the equipment has been operating for some time.