Guidelines for Handling Electrostatic Sensitive Devices (ESD)
D-3
S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
D.2 Electrostatic Charging of Persons
Charging
Every person with a non-conductive connection to the electrical potential of its
surroundings can be charged electrostatically.
Figure D-1 shows you the maximum values for electrostatic voltages which can
build up on a person coming into contact with the materials indicated in the figure.
These values are in conformity with the specifications of IEC 61000-4-2.
Voltage in kV
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
(kV
)
510
20 30 40 50 60 70 80 90 100
Relative air
humidity in %
1
3
1 Synthetic material
2
Wool
3
Antistatic material,
for example, wood
or concrete
2
Figure D-1 Electrostatic Voltages which Can Build up on a Person
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