SICK CLV 420, Operating Instructions Manual

Page: 84 / 146

Chapter 8 Operating Instructions
CLV 42x bar code scanner
8-6
©
SICK AG · Division Auto Ident · Germany · All rights reserved 8 009 981/O078/16-08-2004
Troubleshooting
8.5.2 Malfunctions in reading mode: reading pulse errors
Prerequisite The "Device Ready" LED lights up. If not, see Table 8-3, Page 8-5 .
Malfunction Possible cause Remedy
1. Pulse mode:
sensor input
(external sensor).
The CLV cannot be pulsed:
– the "Laser On" LED does not light up
– the scan line does not appear
•
Incorrect reading pulse source
parameterized on the CLV
•
Polarity of switching input inverted
•
Sensor not connected or connected to
incorrect switching input
•
If sensor supplied by CLV: sensor not
connected to ground potential
•
Photoelectric switch not aligned with the
reflector (photoelectric switch/inductive
sensor not dampened)
•
In the CLV Setup program: Select the
D
EVICE
C
ONFIGURATION
tab and click the
R
EADING
T
RIGGER
P
ARAMETERS
button.
R
EADING
T
RIGGER
S
OURCE
group: sensor
input selected?
•
Active high: reading pulse starts when
power applied
•
Connect sensor to "Sensor 1" switching
input.
Check sensor wiring ( Fig. 5-4, Page 5-8 ).
Measure output signal on sensor.
•
Insert jumper between pin 5 and pin 15
•
Align sensor. Check functioning.
2. Pulse mode:
Reflector polling
The CLV cannot be pulsed:
– the "Laser On" LED flickers but does
not light up constantly
– the scan line is very faint
•
Incorrect reading distance (polling
reflector)
•
Incorrect reflector type used
•
Incorrect pulsing sequence (reflector is
not blocked to start the reading interval
on the CLV)
•
Check: reading distance of reflector in
specified reading range?
•
Check reflector type, Table 4-2,
Page 4-11 .
•
Check sequence:
Read: 1. Block reflector, 2. Read bar
code, 3. Unblock reflector.
3. Pulse mode:
Serial Interface
The CLV cannot be pulsed:
– the "Laser On" LED does not light up
– the scan line does not appear
•
Incorrect reading pulse source
parameterized on the CLV
•
The CLV is not receiving any command
string to start the reading interval on the
data interface
•
In the CLV Setup program: Select the
D
EVICE
C
ONFIGURATION
tab and click the
R
EADING
T
RIGGER
P
ARAMETERS
button.
In the R
EADING
T
RIGGER
S
OURCE
group: is
serial interface selected?
Group S
ERIAL
I
NTERFACE
: is trigger type
correct?
•
Check data connection to host.
In the CLV Setup program: Select the
H
OST
I
NTERFACE
tab.
In D
ATA
F
ORMAT
group: are the correct
interface type (hardware) and data
format selected?
Group: I
NTERFACE
P
ROTOCOL
: are the
correct start and stop characters
selected?
•
Use the CLV Setup program to check the
host command strings: Choose A
UXILIARY
I
NTERFACE
tab. Choose M
ONITOR
H
OST
I
NTERFACE
function. See Chapter 6.5.7
Monitor host interface, Page 6-21.
Download temporarily to the CLV.
4. CLV does not respond to an external
signal that ends the reading pulse
(sensor input, reflector polling, serial
interface)
•
Incorrect end of reading pulse
parameterized on the CLV
•
No sensor signal
•
In the CLV Setup program: Check by
choosing the D
EVICE
C
ONFIGURATION
tab,
click the R
EADING
T
RIGGER
P
ARAMETERS
button. E
ND OF
R
EADING
I
NTERVAL
group: is
"Generated by Trigger Source"
selected?
•
See Malfunction 1, Remedy
Table 8-4: Troubleshooting: reading pulse errors in reading mode