Optimization Of Robustness Of Tag Data Accesses For Readers That Are Operated Simultaneously - Siemens SIMATIC RF600 System Manual

4.3.7.3 Optimization of robustness of tag data accesses for readers that are operated
simultaneously
Parameter data access reliability
If several readers are to be operated simultaneously in an environment, then the following
settings affect the reliability of the reader's access to transponder data:
● Electromagnetic environment (see Chapter The response of electromagnetic waves in the
UHF band (Page 51))
● Type of transponder (see chapter Transponder/tags (Page 205))
● Number of transponders to be detected by an antenna at a time
● Type of antenna (see Chapter Antennas (Page 153), Chapter Guidelines for selecting RFID
UHF antennas (Page 181), and Chapter Planning application (Page 84))
● Transponders' distance from and orientation toward antennas (see Chapter Transponder/
tags (Page 205))
● Distances and orientation of antennas of different readers to each other
● Radiated power of antennas
The robustness of tag data accesses is improved for readers whenever distances to adjacent
readers are increased, radiated power is reduced, and a channel plan (for ETSI readers) is
implemented. Adjacent readers are parameterized in the channel plan such that they cannot
use the same channels.
A channel plan can be created for ETSI readers; for FCC readers, it is assumed that the
probability of two readers accidentally using the same channel is very low.
SIMATIC RF620R reader
The RF620R has an integrated, circular polarized antenna. This means that the type of antenna
cannot be freely selected.
Note
Rotation of the reader through 90° around the z axis
Since the horizontal electrical opening angle of the RF620R antenna is greater than the
vertical electrical opening angle, the effects on adjacent readers can be reduced by rotating
the reader through 90° around the z axis (see coordinate diagram in Chapters Antenna
diagram for RF620R (ETSI) (Page 85) and Antenna diagram for RF620R (FCC)
(Page 88)).
SIMATIC RF670R, RF630R or RF660R reader with SIMATIC RF660A antenna
The electrical opening angles (vertical and horizontal) of the RF660A antenna are identical.
Therefore, the robustness of the readers' access to transponder data cannot be optimized
further by rotating them around the antenna axis.
SIMATIC RF600
System Manual, 06/2010, J31069-D0171-U001-A10-7618
Draft Version 02.06.2010
RF600 system planning
4.3 Antenna configurations
49