Operating Instructions
Chapter
4
CLV640 Bar Code Scanner
Product description
8011975/0000/2008-04-14
©
SICK AG · Division Auto Ident · Germany · All rights reserved
31
4.6.2
Object trigger control
In order to start an object-related reading process, the bar code scanner requires an appro-
priate external signal (trigger source) for reporting an object in the reading area. The start
signal is emitted via an external reading pulse sensor (e. g.
photoelectric reflex switch
) as
standard. As soon as an object has passed the reading pulse sensor, a time window opens
in the bar code scanner (“reading gate“) for the reading process.
Alternatively, a command activates the reading process via a data interface or the CAN-SEN-
SOR network. In Automatic Cycle mode, the actual bar code scanner generates the reading
gate internally with an adjustable mark-space ratio.
The reading pulse can be ended in a number of ways: With external triggering by the reading
pulse source or a command, internally by a timer or an evaluation condition to be met.
4.6.3
Switchable focus position
The focus position can be changed for the CLV640 thus covering a wide reading area.
You can define up to 8 reading areas for the distance configuration which can be started in
any order by the lens in reading operation.
Fig. 4-4:
Switching the focus for CLV640: Division of the entire reading area in distance
configurations
The focus is shifted by changing the object position (e. g. when reading downwards: detec-
tion of object height).
Note
The trigger source can be configured using the SOPAS-ET configuration software:
P
ROJECT
T
REE
, CLV640, P
ARAMETER
, R
EADING
C
ONFIGURATION
, O
BJECT
T
RIGGER
C
ONTROL
, register
tab S
TART
/S
TOP
OF
O
BJECT
T
RIGGER
