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 8-1
8 Troubleshooting
8.1 Overview of errors and malfunctions which could occur
8.1.1 Installation errors
• CLV aligned incorrectly with the object carrying the bar code (e. g. masking)
• Reading pulse sensor positioned incorrectly
8.1.2 Electrical connection errors
• Interfaces on the CLV connected incorrectly (wiring error in CDB 420 or CDM 420)
8.1.3 Parameterization errors
• Functions not adjusted to local conditions, e. g. communication parameters on the host
interface are set incorrectly
• Technical limits of the device exceeded, e. g. relationship between the scanning
frequency and the reading distance
8.1.4 Malfunctions during operation
• Laser timeout for laser diode elapsed
• Device error (hardware/software)
8.2 Monitoring errors and malfunctions
The CLV is self-monitoring:
• After the power supply has been switched on, the CLV automatically carries out a self-
test, in which it checks important hardware components, before it is initialized (loading
of parameter set and initializing of device functions). The self-test can be repeated at
any time by canceling reading mode. For calling up, see
Chapter 6.5.9 Self-test,
Page 6-23.
• If the CLV detects an error during the self-test or at any other time, it outputs the error
status ST=3 via the host interface. Prerequisite: the error status is enabled for
transmission. By default, transfer is blocked.
The CLV displays the diagnosed error as a numeric combination in the fourth field from
the left on the bottom, in the status line of CLV Setup (
Table 8-1).
• While it is in operation, the CLV constantly monitors the laser diode and speed of the
polygon mirror wheel. In addition, a watchdog circuit responds to error statuses.
• A timer automatically deactivates the laser diode 10 minutes (default setting) after a
continuous reading pulse is initiated in reading mode with switching input pulse modes
"Sensor Input" and "Serial Interface". In this case, the CLV outputs the message: "
Laser
safety timeout
". The reading pulse must be terminated by resetting the pulse signal. The
laser diode is activated again by the next reading pulse.
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