Technical data

Technical data
6.1 General technical data
RS 485 Repeater
30 Manual, 02/2011, A5E03382072-01
6.1.2 Electromagnetic Compatibility
Definition
Electromagnetic compatibility (EMC) is the ability of an electrical installation to function
satisfactorily in its electromagnetic environment without interfering with that environment.
The S7-300 modules also satisfy requirements of EMC legislation for the European domestic
market. Compliance of the S7-300 system with specifications and directives on electric
design is prerequisite.
Pulseshaped disturbance
The table below shows the EMC compatibility of S7 modules in areas subject to pulse-
shaped disturbance.
Pulse-shaped disturbance Test voltage corresponds with degree
of severity
Electrostatic discharge
according to IEC 61000-4-2
Air discharge: ± 8 kV
Contact discharge ± 4 kV
3
2
Burst pulses (high-speed
transient disturbance)
to IEC 61000-4-4.
2 kV (power supply lines)
2 kV (signal lines > 3 m)
1 kV (signal lines < 3 m)
3
3
High-energy single pulse (surge) to IEC 61000-4-5
External protective circuit required
(refer to operating instructions SIMATIC S7-300, CPU 31xC and CPU 31x:
Installing (http://support.automation.siemens.com/WW/view
/en/13008499)
in Chapter "Lightning and overvoltage protection")
 asymmetric coupling
2 kV (power supply lines)
DC with protective elements
2 kV (signal/ data line only > 3 m),
with protective elements as required
 symmetric coupling
1 kV (power supply lines) DC with
protective elements
1 kV (signal/ data line only > 3 m),
with protective elements as required
3
Additional measures
When connecting an S7-300 system to the public network, always ensure compliance with
Limit Value Class B to EN 55022.