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Chapter
10
Operating Instructions
CLV 490 Bar Code Scanner
10-86
©
SICK AG · Division Auto Ident · Germany · All rights reserved
8 009 993/O824/20-12-2004
Appendix
Error messages
Messages in
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plain text or coded (3-digit) that are used to identify a malfunction on the
CLV in Reading mode. The messages are output on the terminal interface only. Exception:
ST = 3 (device error), which is also output on the host interface. The error messages can
be displayed in the Terminal emulator in the "CLV-Setup" program.
Error status
Identifier output with the reading result by the CLV for errors that were diagnosed while the
bar code was being read. The entry for the host interface is made in the "Code-Info/Sepa-
rator" block of the
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data output string and must be enabled using the parameters (for the
CLV 490 disabled by default).
Focus position
Distance of the focal point of the emitted laser beam in front of the reading window. Can be
varied using the optical components in the CLV. Creates a distance-specific depth of field
(DOF) in which he bar code can be detected.
Functional interfaces
Switching inputs and outputs on the CLV.
Good Read
The CLV successfully detected a bar code or the required number of bar codes specified by
the evaluation parameters during the
Ö
reading pulse.
Header
Data block in the reading result on the
Ö
host interface. Used as a header in the
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data
output string for the subsequent data content of the bar codes. Contains up to 10 elements,
consisting of reading diagnosis data and/or constants (control characters, letters, digits), de-
pending on the configuration. The "Header" block is empty in the default setting of the
CLV 490.
Host interface
Main data interface on the CLV with configurable data output format. Used to output the
Ö
reading result in telegram form to the host/PLC. Integrates the CLV in the SICK network
(RS 485) or builds a master/slave arrangement. Physically switchable to RS 232 or RS 422/
485. It supports various transmission protocols.
Increment management
Used in certain applications to separate bar codes with identical contents that move during
the reading procedure and assign them to the objects.
Line scanner
Scanner that uses a polygon mirror wheel with paraxial mirrors to deflect a focused laser
beam extremely fast. As a result, it creates a light spot in the reading plane that moves along
a straight line, which appears to the naked eye as a stationary scan line.
Line scanner with oscillating mirror
Line scanner that also deflects the laser beam about a central position, on both sides and
perpendicular to the scan direction using an oscillating mirror. By doing so, the CLV can
search for bar codes in larger areas. In addition to basic deflection with the maximum oscil-