Siemens SIMATIC RF300, Системное руководство

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Table 4-36 Flush-mounting of transponders and readers
Representation Description
Non-metallic spacer Sheet
Metal
Metal
Readers
Problem:
Flush-mounting of transponders and
readers is possible in principle. How‐
ever, the size of the transmission win‐
dow is significantly reduced. The fol‐
lowing measures can be used to
counteract the reduction of the win‐
dow:
10-20 mm
x > 100 mm
Reader
Remedy:
Enlargement of the non-metallic
spacer below the transponder and/or
reader.
The transponder and/or reader are 10
to 20 mm higher than the metal sur‐
round.
(The value x ≥ 100 mm is valid, e.g.
for RF310R. It indicates that, for a dis‐
tance x ≥ 100 mm, the reader can no
longer be significantly affected by
metal.)
a
a
b
b
Reader
Remedy:
Increase the distances a, b to metal.
The following rule of thumb can be
used:
• Increase a, b by a factor of 2 to 3
over the values specified for met‐
al-free areas
• Increasing a, b has a greater ef‐
fect for readers or transponders
with a large limit distance than for
readers or transponders with a
small limit distance.
Mounting of several readers on metal frames or racks
Any reader mounted on metal couples part of the field to the metal frame. There is normally no
interaction as long as the minimum distance D and metal-free areas a, b are maintained.
However, interaction may take place if an iron frame is positioned unfavorably. Longer data
transfer times or sporadic error messages at the communication module are the result.
Note that antenna cables should not be coiled (cable coil = antenna) and should not be mounted
directly on metal when coiled to avoid coupling. Antenna cables should be laid separately in a
Planning the RF300 system
4.3 Installation guidelines
SIMATIC RF300
System Manual, 02/2021, C79000-G8976-C345-09
67