Siemens Simatic RF300 System Manual page 110

Planning the RF300 system
4.5 Guidelines for electromagnetic compatibility (EMC)
4.5.2 What does EMC mean?
The increasing use of electrical and electronic devices is accompanied by:
● Higher component density
● More switched power electronics
● Increasing switching rates
● Lower power consumption of components due to steeper switching edges
The higher the degree of automation, the greater the risk of interaction between devices.
Electromagnetic compatibility (EMC) is the ability of an electrical or electronic device to
operate satisfactorily in an electromagnetic environment without affecting or interfering with
the environment over and above certain limits.
EMC can be broken down into three different areas:
● Internal immunity to interference:
Immunity to internal (own) electrical disturbance
● External immunity to interference:
Immunity to external electromagnetic disturbances
● Degree of interference emission:
Emission of interference and its effect on the electrical environment
All three areas are considered when testing an electrical device.
The RFID modules are tested for conformity with the limit values required by the CE and
R&TTE directives. Since the RFID modules are merely components of an overall system,
and sources of interference can arise as a result of combining different components, certain
directives have to be followed when setting up a plant.
EMC measures usually consist of a complete package of measures, all of which need to be
implemented in order to ensure that the plant is immune to interference.
Note
The plant manufacturer is responsible for the observance of the EMC directives; the plant
operator is responsible for radio interference suppression in the overall plant.
All measures taken when setting up the plant prevent expensive retrospective modifications
and interference suppression measures.
The plant operator must comply with the locally applicable laws and regulations. They are
not covered in this document.
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System Manual, 07/2017, C79000-G8976-C345-07
SIMATIC RF300