Basic Rules - Siemens SIMATIC RF600 System Manual

EMC can be broken down into three different areas:
● Intrinsic immunity to interference:
● Immunity to external interference:
● Degree of interference emission:
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
RTTE guidelines. 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
guidelines 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 guidelines; 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.
4.7.3

Basic rules

It is often sufficient to follow a few elementary rules in order to ensure electromagnetic
compatiblity (EMC).
The following rules must be observed:
Shielding by enclosure
● Protect the device against external interference by installing it in a cabinet or housing.
● Use metal plates to shield against electromagnetic fields generated by inductances.
● Use metal connector housings to shield data conductors.
SIMATIC RF600
System Manual, 05/2012, J31069-D0171-U001-A13-7618
immunity to internal electrical disturbance
immunity to external electromagnetic disturbance
emission of interference and its effect on the electrical environment
The housing or enclosure must be connected to the chassis ground.
4.7 Guidelines for electromagnetic compatibility (EMC)
RF600 system planning
83