Siemens SIMATIC MOBY D System Manual page 73

What interference can affect RFID?
Interference source
Switched-mode power supply Interference emitted from the
Interference injected through
the cables connected in
series
HF interference over the
antennas
MOBY D
System Manual, 01/2010, J31069-D0147-A6-7618
Cause
current infeed
Cable is inadequately
shielded
The reader is not connected
to ground.
caused by another reader
from external noise sources
(frequency converters,
fluorescent lamps, etc.)
Planning the MOBY D system
4.5 EMC Guidelines
Remedy
Replace the power supply

Ferrite in the supply line

Better cable shielding
Ground the reader
Position the antennas further

apart.
Erect suitable damping materials

between the antennas.
Reduce the power of the readers.

Please note the instructions in the
Installation
Section
guidelines/reducing the influence of
metal
Minimize sources of noise

Shield

Compensation

Point-to-point grounding

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