RF600 system planning
4.10 Guidelines for electromagnetic compatibility (EMC)
SIMATIC RF600
System Manual, 06/2019, J31069-D0171-U001-A22-7618
101
IInterference sources
In order to achieve a high level of electromagnetic compatibility and thus a very low level of
disturbance in a plant, it is necessary to recognize the most frequent interference sources.
These must then be eliminated by appropriate measures.
Table 4- 21
Interference sources: origin and effect
Interference source
Interferrence results from
Effect on the interference sink
Contactor,
electronic valves
Contacts
System disturbances
Coils
Magnetic field
Electrical motor
Collector
Electrical field
Winding
Magnetic field
Electric welding device
Contacts
Electrical field
Transformer
Magnetic field, system disturbance,
transient currents
Power supply unit, switched-
mode
Circuit
Electrical and magnetic field, system
disturbance
High-frequency appliances
Circuit
Electromagnetic field
Transmitter
(e.g. professional mobile
radio)
Antenna
Electromagnetic field
Ground or reference potential
difference
Voltage difference
Transient currents
Operator
Static charge
Electrical discharge currents, electrical
field
Power cable
Current flow
Electrical and magnetic field, system
disturbance
High-voltage cable
Voltage difference
Electrical field
What interference can affect RFID?
Table 4- 22
Interference sources: Causes and remedies
Interference source
Cause
Remedy
Switched-mode power supply Interference emitted from the
current infeed
Replace the power supply
Interference injected through
the cables connected in
series
Cable is inadequately shield-
ed
Better cable shielding
The reader is not connected
to ground.
Ground the reader