Omron V780-Series User Manual page 111

Precautions for Correct Use
• Use the results of communications diagnosis as a guideline. An indication of a stable com-
munication (green) does not necessarily mean that communications are normal.
• An indicator of an unstable communication (yellow), does not necessarily mean that commu-
nications are not possible. It merely means that there is little leeway in communications. If
you want to ensure more stable communications, we recommend that you use the
Reader/Writer so that stable communications (green) are indicated.
• If you enable communications diagnostics, the communications times will be increased by up
to 100 ms.
• Communications diagnostics are performed during single-access communications com-
mands. Diagnosis is not performed for multiaccess commands.
• The communications performance in the UHF band is affected by ambient objects, such as
metal objects. Therefore, perform sufficient testing in advance of actual system operation.
Diagnostics
Communications diagnostics give the following diagnostic results when communications are unsta-
ble.
Notifi-
cation
Diagnostic result
prior-
ity
High A: Insufficient
power to send
B: Insufficient
power to receive
C: Too much noise
D: Insufficient read
data
Low E: Excessive read
data
You can use communications diagnosis to detect deterioration of performance for the following con-
ditions. Use the diagnostic result to infer the cause and implement countermeasures.
Diagnostic
result
A/B Communications performance was
reduced by an excessive communications
distance between the Reader/Writer and
RF Tag.
A/B Communications performance was
reduced because the RF Tag was inclined
in relation to the Reader/Writer.
A/B Communications performance was
reduced because the position of the RF
Tag was offset in relation to the
Reader/Writer.
UHF RFID System V780-series Reader/Writer User's Manual (EtherNet/IP
Description
Indicates that the signal strength of the signal sent from the
Reader/Writer to the RF Tag was weak.
Indicates that the signal strength of the signal returned
from the RF Tag to the Reader/Writer was weak.
Indicates that the noise level around the Reader/Writer
was too high.
Indicates that there was an insufficient number of success-
ful communications with a target RF Tag that entered the
communications range of the Reader/Writer, i.e., that there
is no leeway in distinguishing the target RF Tag.
Indicates that the influence of a non-target RF Tag in
Reader/Writer communications range prevented verifying
the target RF Tag.
Possible cause
TM
Workaround
Place the RF Tag closer to the Reader/Writer.
Mount the RF Tag so that it faces the
Reader/Writer.
Communicate with the RF Tag when it is in front of
the Reader/Writer.
) (Z402)
6 Functions
Remarks
6
Diagnostic process-
ing for these results
is performed only in
Focus Mode.
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