Rockwell-automation 56RF RFID System User Manual Manual de usuario descargar pdf (Pagina 46)

46 Rockwell Automation Publication 56RF-UM001A-EN-P - October 2011

Chapter 5 Mechanical Installation

Spacing Next to Metal

Surfaces

For the square transceiver, the communication distance will drop significantly

when the distance between the transceiver and any surrounding metal is 30mm

(1.2 in.) or less. For the rectangular transceiver, the communication distance will

drop significantly when the distance between the transceiver and any

surrounding metal is 50mm (2 in.) or less.

Figure 13 - Tranceiver Spacing with Metal Surfaces

Transceiver Field Maps

The transceiver has a three-dimensional RF field emanating from its sensing

surface. The field consists of a main center lobe and a secondary side lobe.

The RF tags must enter the RF field once, stay long enough to complete the read

and write cycles, and then to leave the field smoothly and efficiently.

Ideally, the RFID tag should pass through the widest section of the main lobe.

This maximizes the time the transceiver has for reading and writing. Avoid the

top of the field, and avoid the side lobes.

The preferred direction of travel is for the tag to pass across the RFID sensor

surface. The tag can also approach the sensor surface directly and then move away

directly backwards or to the side.

Figure 14

shows the field map of the 65mm x 65mm transceiver.

(30 mm)

or more

Metal

(50 mm)

or more

Metal

Square Transceiver Rectangular Transceiver

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Rockwell-automation 56RF RFID System User Manual Manual de usuario Pagina 46