Effects Of Metal On Different Transponders And Readers - Siemens SIMATIC RF200 System Manual

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.
Table 4- 20 Mounting of several readers on metal frames or racks
Representation
4.3.3

Effects of metal on different transponders and readers

Mounting different transponders and readers on metal or flush-mounting
Certain conditions have to be observed when mounting the transponders and readers on
metal or flush-mounting. For more information, please refer to the descriptions of the
individual transponders and readers in the relevant section.
SIMATIC RF200
System Manual, 07/2017, J31069-D0227-U001-A9-7619
Planning the RF200 system
Description
Problem:
Interaction between readers
Remedy:
Increase the distance D between the two readers.
Remedy:
Introduce one or more iron struts in order to short-
circuit the stray fields.
Remedy:
Insert a non-metallic spacer of 20 to 40 millimeter
thickness between the reader and the iron frame. This
will significantly reduce the induction of stray fields on
the rack:
4.3 Installation guidelines
53