Siemens S7-300 Installation And Operating Manual page 63

Pulse-shaped interference
The table below shows the EMC of fail-safe modules in terms of pulse-shaped interference.
The S7-300/M7-300/ET 200M system must comply with electrical installation specifications
and guidelines.
Note
Not suitable for use in residential areas.
Use in residential areas is possible if suitable additional measures are taken to achieve limit
class B.
Electrostatic discharge to
IEC 61000-4-2 (DIN VDE 0843 Part 2)
Burst pulse (high-speed transient
interference) to IEC 61000-4-4
(DIN VDE 0843 Part 4)
Surge pulse to IEC 61000-4-5 (DIN VDE 0839 Part 10)
No external protective circuit required (cf. operating instructions
CPU 31xC and CPU 31x: Installation
voltage protection")*
Asymmetrical coupling
Symmetrical coupling
*External protective circuit required for severity level 3. Test value for asymmetrical coupling = 2 kV;
for symmetrical coupling = 1 kV.
Fail-safe signal modules
Installation and Operating Manual, 01/2010, A5E00085586-10
Pulse-shaped interference Test voltage
8 kV
6 kV
2 kV
(power supply lines)
2 kV
(signal line)
, chapter "Lightning and surge
1 kV
(power supply lines)
1 kV
(signal line)
data line)
0.5 kV
(power supply lines)
0.5 kV
(signal line)
data line)
General technical data
7.3 Electromagnetic Compatibility
Degree of severity
3 (air discharge)
3 (contact discharge)
3
4
S7-300,
2*
63