Appendix
A.1 Planning and installation of UHF read points
SIMATIC RF650R/RF680R/RF685R
Configuration Manual, 03/2018, C79000-G8976-C386-06
317
● Reader ↔ reader influence: Several readers influence or disturb each other during
transponder identification.
Approaches to solutions:
– "Interconnect" neighboring readers so that they do not send at the same time
– Enable intermissions ("Settings - General" menu item)
– Channel management
● Reader ↔ transponder influence: A reader communicates with a transponder that is also
in the identification area of another reader.
Solution approaches:
– "Interconnect" neighboring readers so that they do not send at the same time
● Other sources of disturbances that can lead to restriction of transponder identification.
Other sources of disturbances can occur if there are devices with similar frequency bands
(for example 900 MHz) in the vicinity of the reader. The diagnostics corresponds to the
influence of one reader on another. Mobile phones can also disturb identification. This is
the case if a reader of the type FCC or CMIIT is operated in Europe.
Solution approaches:
– The disturbances can be eliminated by temporarily turning off the suspected source of
interference or its shielding. Interference can also occur with devices in other
frequency bands if these are located in the immediate vicinity of the RFID antenna
(e.g. DECT telephone directly in front of the RFID antenna). Common industrial
interference mechanisms, such as the harmonics of frequency converters or static
discharge (ESD) can also cause disturbances.
Note
Occurrence of disturbances
Remember that these disturbances can also occur sporadically or in certain combinations.
Measures for eliminating field disturbances
Using shields
To avoid reflections, you can fit UHF absorbent material. To do this, the absorbent material
is mounted at various suspected reflection points until the field disturbance no longer occurs.
Where possible, avoid the use of metal structures (for example housings) and use plastic
instead.
Even with reader-to-reader influence, you can use absorbent plates or shielding sheets.
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