Siemens S7-300 Installation And Operating Manual page 67

Emission of radio interferences
Emission of electromagnetic interference to EN 55011:
Limit class A, group 1
from 20 MHz to 230 MHz
from 230 MHz to 1000 MHz
Measured at a distance of 30 m
Interference emission at AC mains to EN 55011:
Limit class A, group 1
from 0.15 MHz to 0.5 MHz
from 0.5 MHz to 5 MHz
from 5 MHz to 30 MHz
Redundant configuration of ET 200M
Note
If you use the ET 200M in a redundant configuration, it must be in a control cabinet with
sufficient damping to ensure compliance with limit class A for radio interferences.
Expanding the field of application
When operating fail-safe signal modules in residential areas, you must ensure limit class B to
EN 55011 in terms of RF radiation.
Measures to be taken in order achieve RF interference limit class B include:
● Installation in grounded cabinets/cubicles
● Installation of filters in the power supply lines
Fail-safe signal modules
Installation and Operating Manual, 01/2010, A5E00085586-10
7.3 Electromagnetic Compatibility
< 30 dB (µV/m)Q
< 37 dB (µV/m)Q
< 79 dB (µV)Q, < 66 dB (µV)M
< 73 dB (µV)Q, < 60 dB (µV)M
< 73 dB (µV)Q, < 60 dB (µV)M
General technical data
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