Transponder
7.1 Overview
SIMATIC RF600
System Manual, 11/2018, J31069-D0171-U001-A21-7618
341
7.1.5.2 Effects of the materials of the mounting surfaces on the range
Effects due to antenna mounting
For the RF640A, RF642A, RF650A, RF660A and RF680A antennas, the antenna gain and
therefore the maximum read/write range does not depend on the selected material of the
mounting surface. In contrast to this, the antenna gain of the RF615A and RF620A antennas
and therefore the maximum read/write range of transponders depends on the mounting
surface of the antenna. To achieve the maximum range with an RF615A/RF620A antenna,
the antenna needs to be mounted on a metallic surface of at least 150 x 150 mm.
You will find more detailed information on antenna gain in the subsections of the section
"Antenna patterns (Page 230)".
Effects due to transponder mounting
The maximum read/write range of the transponders depends on the material of the mounting
surface. The specified ranges apply when mounted on non-metallic surfaces, such as paper
or card, with the RF625T, RF630T, RF640T and RF645T when mounted on metal.
Mounting on plastic can reduce the maximum read/write range considerably depending on
the type of plastic (up to 70%). When mounted on wood, the range is furhter reduced the
more moisture the wood contains. Due to the attenuating properties of glass, direct mounting
without a spacer can halve the range.
If the RF625T, RF630T, RF640T, RF645T, RF680T or RF682T transponders are mounted
on metal, this metallic surface acts as a reflection surface. This surface should therefore be
adequately large. To achieve the listed maximum ranges, transponders must be mounted on
a metallic mounting surface with a minimum diameter of 150 mm, for the RF630T and
RF680T 300 mm. If the metallic mounting surface only has a diameter of 65 mm instead of
the required 150 mm, the range is reduced by 65%.
7.1.5.3 Maximum read/write ranges of transponders
Maximum read ranges
The measurements were made under the following conditions:
● Radio profile ETSI
● Maximum possible radiated power of the reader or antenna.
● Optimum transponder alignment and mounting surface
● With antenna connected:
– With a 3 meter long antenna cable with 1 dB cable loss (article number:
6GT2815-0BH30)
– RF615A and RF620A: Mounted on metal.
– RF680A: Circular polarization
● Room temperature of approx. 20 - 25 °C
● Low-reflec
tion environment; Ranges may be smaller or larger depending on the ambient
conditions.
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