Siemens PANEL PC 877 Benutzerhandbuch

 

SIMATIC Panel PC 877 
Operating instructions, Release 07/2006, A5E00877780-01 

B-1

 

B 

ESD directives 

B

B.1 

B.1 

ESD guideline 

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 plate. The rating plate is described in the chapter 

"Planning use."