Omron V680S Series User Manual page 222

Section 8
Appendices
V680-D1KP58HTN
 Influence of Metal at Back Surface
You must consider the influence of the mounting location when mounting RF Tags.
The communications range of an RF Tag may be reduced by the influence of the surrounding objects.
The amount that the communications range decreases will depend on the materials and shapes of the
surrounding objects. As reference data, this section shows the influence of metal at the back surface of
an RF Tag.
 Influence of Metal Objects
The following figure shows the percentage of decrease in the communications range when there is a
metal object at the back surface of an RF Tag.
The X axis gives the distance between the RF Tag and a metal plate. The Y axis shows the relative
communications range taking the communications range with no metal plate as 100% (i.e., it shows the
percentage of decrease in the communications range).
V680S-HMD64-ETN and V680-D1KP58HTN
(%)
100
90
80
70
60
50
40
30
20
10
0 20
V680S-HMD66-ETN and V680-D1KP58HTN
(%)
100
90
80
70
60
50
40
30
20
10
0 20
Material: Steel (thickness: 1.5 mm)
Shape: 295  295 mm
RFID System
220
User's Manual
40 60 80 100 120 140
Distance (x) to the metal plate in back of RF Tag
40 60 80 100 120 140
Distance (x) to the metal plate in back of RF Tag
Reader/Writer
Communications
range
Metal
Non-Metallic material
160 180 (mm)
Reader/Writer
Communications
range
Metal
Non-Metallic material
160 180
(mm)
RF Tag
Metal at back surface
Y
X
RF Tag
Metal at back surface
Y
X