
General specifications
1.2 Electromagnetic compatibility
S7-400 Automation System Module Data
Reference Manual, Edition 09/2009, A5E00850736-06
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1.2 Electromagnetic compatibility
Introduction
In this section you will find details of the noise immunity of S7-400 modules and details of
radio interference suppression.
All the components of S7-400 automation system meet the requirements of the standards
that apply in Europe provided they are installed in accordance with all the appropriate
regulations (see
Installation Manual, Chapters 2 and 4
).
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.
WARNING
Personal injury or property damage can result.
Installation of expansions that have not been approved for the S7-400 can result in
violations of the requirements and regulations for safety and electromagnetic compatibility.
Use only expansions that have been approved for the system.
Pulse-shaped interference
The following table shows the electromagnetic compatibility of modules with regard to pulse-
shaped interference. Compliance of the S7-400 system with specifications and directives on
electric design is prerequisite.
Table 1- 3 Pulse-shaped interference
Pulse-shaped interference Test voltage Degree of
severity
Electrostatic discharge
conforming to IEC 61000-4-2
Air discharge:
Contact discharge:
±8 kV
±6 kV
3
Bursts (fast transient interference in
accordance with IEC 61000-4-4)
2 kV (power supply lines)
2 kV (signal lines > 30 m)
1 kV (signal lines < 30 m)
3
High-energy single pulse (surge) to
IEC 61000-4-5
Asymmetrical coupling
2 kV (supply line) DC voltage with
protective elements
2 kV (signal/data line > 30 m only),
possibly with protective elements
Symmetrical coupling
1 kV (supply line) DC voltage with
protective elements
1 kV (signal line > 30 m only), possibly
with protective elements
3
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