SICK CLV 420, Operating Instructions Manual

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Operating Instructions Chapter 8
CLV 42x bar code scanner
Troubleshooting
8 009 981/O078/16-08-2004
©
SICK AG · Division Auto Ident · Germany · All rights reserved
8-7
8.5.3 Malfunctions in reading mode: result output errors
Check whether the "Device Ready" LED illuminates.
If the LED does not illuminate, follow Table 8-3, Page 8-5 .
For the following, the number of bar codes to be read is 1.
Malfunction Possible cause Remedy
1. The "Result" LED
(default setting: "Good read") does not
light up at the end of the reading pulse.
– The "Result 2" switching output
(default setting: "Good read") is
not outputting a pulse
– The CLV outputs the status ST = 2
in the reading result on the host
interface (if ST is enabled for the
separator; this is not selected in
the default setting)
•
Read not successful, since there was no
bar code in the reading field during the
reading pulse
•
Scan line positioned incorrectly
•
Evaluation range of the scan line is
limited improperly (CP values)
•
Bar code presented at incorrect reading
distance
•
The bar code is tilted excessively with
respect to the scan line
•
The reading angles at which the bar code
appears to the CLV are too large
•
Bar code is in total reflection zone
•
Synchronize reading with an object in the
reading field.
See Chapter 8.5.2 Malfunctions in
reading mode: reading pulse errors,
Page 8-6
.
•
Align CLV.
Is bar code at center of scan line?
In the CLV Setup program: check reading
quality. Choose P
ERCENTAGE
E
VALUATION
.
See Chapter 6.5.2 Percentage evalua-
tion, Page 6-17 .
•
In the CLV Setup program: Check by
choosing the R
EADING
C
ONFIGURATION
tab,
C
ODE
P
OSITION
group: are the min. and
max. code position values correct?
Check with S
HOW
CP-
LIMITS
.
See Chapter 6.5.4 Show CP-limits,
Page 6-19 .
•
Check: reading distance of bar code in
specified reading range?
•
Align bar code accordingly.
•
In the CLV Setup program: Start
P
ERCENTAGE
E
VALUATION
, select D
ISTANCE
C
ONFIGURATION
(if used).
Monitor reading quality (reading quality
>70 %!).
Realign CLV if necessary.
•
Optimize CLV alignment (scan line should
strike the bar code at an skew of approx.
15
°
).
In the CLV Setup program: check reading
quality. Start P
ERCENTAGE
E
VALUATION
. See
Chapter 6.5.2 Percentage evaluation,
Page 6-17
.
Table 8-5: Troubleshooting: result output errors in reading mode