General Technical Specifications
1-6
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
1.2 Electromagnetic Compatibility
Introduction
In this section you will find details of the noise immunity of S7-300 modules and
details of radio interference suppression.
The S7-300 modules satisfy, among other things, the requirements of the law
applicable to EMC on the European domestic market.
Definition of “EMC”
Electromagnetic compatibility (EMC) is the ability of an electrical installation to
function satisfactorily in its electromagnetic environment without interfering with
that environment.
Pulse-shaped interference
The following table shows the electromagnetic compatibility of modules compared
to pulse-shaped disturbance variables. A requirement for this is that the S7-300
system complies with the specifications and directives on electric design.
Table 1-2 Pulse-Shaped Interference
Pulse-Shaped Interference
Tested with Satisfies
degree of
severity
Electrostatic discharge
according to IEC 61000-4-2
Discharge in air:"8 kV
Contact discharge: "4 kV
3
Bursts (fast transient bursts) to
IEC 61000-4-4
2 kV (supply cable)
2 kV (signal cable > 3 m)
1 kV (signal cable < 3 m)
3
Energy-rich single impulse (surge) according to IEC 61000-4-5
External protective circuit required (refer to the manual
S7-300 Programmable Logic Controller, Hardware and Installation,
Chapter “Lightning Protection and Overvoltage Protection”)
• Asymmetrical coupling 2 kV (supply cable)
Direct voltage with protective
elements
2 kV (signal/
data cable only > 3 m) possi-
bly with protection elements
3
• Symmetrical coupling 1 kV (supply cable)
Direct voltage with protection
elements
1 kV (signal line only > 3 m)
possibly with protection ele-
ments
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