Omron V680S Series User Manual page 224

Section 8
Appendices
V680-D8KF67
 Influence of Metal at Back Surface of RF Tags
The communications range will decrease if there is metal at the back of the V680-D8KF667 RF Tag. If
the RF Tag is mounted on metallic material, use a non-metallic spacer (e.g., plastic or resin). The
following graphs show the relationship between the distance from the RF Tag to the metallic surface
and the communications range.
V680S-HMD64-ETN and V680-D8KF67
(%)
100
90
80
70
60
50
40
30
20
10
0 25
Distance (x) to the metal plate in back of RF Tag
Reader/Writer
Metal
Non-Metallic material
 Mutual Interference of RF Tags
If you use more than one RF Tag, separate them by at least the interval shown below to prevent
malfunctions due to mutual interference.
If the distance between the RF tags is too short, read / write distance will be reduced.
 V680S-HMD64-ETN Reader/Writer
 V680S-HMD66-ETN Reader/Writer
RFID System
222
User's Manual
50 75 100 125
RF Tag
Metal at back surface
Y
Communications
range
X
80mm min.
110mm min.
V680S-HMD66-ETN and V680-D8KF67
(%)
100
90
80
70
60
50
40
30
20
10
(mm) 0 25
Distance (x) to the metal plate in back of RF Tag
Reader/Writer
Metal
Non-Metallic material
80mm min.
110mm min.
50 75 100 125 (mm)
RF Tag
Metal at back surface
Y
Communications
range
X