Siemens SIMATIC RF640A, Системное руководство

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RF600 system planning
4.3 Antenna configurations
SIMATIC RF600
48
System Manual, 11/2018, J31069-D0171-U001-A21-7618
Antenna spacing with portal configuration
In the portal configuration, multiple antennas are connected to one reader. In this case, the
antennas must not exceed the maximum distance to one another.
Table 4- 2 Maximum antenna spacing of the external antennas with a portal configuration
Antenna
configuration
Antenna alignment Maximum distance (D)
RF600 reader with
RF615A/RF620A
RF600 reader with
RF640A/RF642A
RF600 reader with
RF650A/RF660A/RF680
A
B Pointing at each other 2.0 m 8.0 m 8.0 m
1)
Portal spacing of up to 10 m is possible. The probability of a read must be checked.
Optimization of the antenna arrangement
With the RF685R reader (with internal antenna)
The RF685R reader has an integrated switchable antenna (circular or linear polarization).
With the RF640A/RF642A/RF660A antennas
The electrical aperture angles (vertical and horizontal) of the RF660A antenna are identical,
with the RF640A/RF642A antennas they are similar. Therefore, the robustness of the
readers' access to transponder data cannot be optimized for the RF660A and with the
RF640A/RF642A it can be optimized only to a limited extent by rotating around the antenna
axis.
4.3.6 Read and write range
The read/write range between the reader/antenna and the transponder is influenced by the
following factors:
Table 4- 3 Factors on the read/write range
Factors Description
Transmit power of the reader The higher the transmit power of the reader, the larger the
reading range.
Transponder size and design The larger the transponder antenna, the larger the power
input area and therefore the larger the reading range.
Absorption factor of the materials The higher the absorption of the surrounding material, the
smaller the reading range.
Manufacturing quality of the tran-
sponders
The better the transponder has been matched to the oper-
ating frequencies during manufacturing, the greater the
reading range.