Siemens SIMATIC Ident System Manual

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Planning the RF300 system4.3 Installation guidelinesSIMATIC RF30064 System Manual, 07/2016, C79000-G8976-C345-0xMounting of several readers on metal frames or racksAny reader mounted on metal couples part of the field to the metal frame. There is normallyno 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 datatransfer times or sporadic error messages at the communication module are the result.Table 4- 31 Mounting several readers on metal frames or racksRepresentation DescriptionProblem:Interaction between readersRemedy: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 millimeterthickness between the reader and the iron frame. Thiswill significantly reduce the induction of stray fields onthe rack:4.3.3 Effects of metal on different transponders and readersMounting different transponders and readers on metal or flush-mountingCertain conditions have to be observed when mounting the transponders and readers onmetal or flush-mounting. For more information, please refer to the descriptions of theindividual transponders and readers in the relevant section.