Operating Instructions
Chapter
4
CLV 42x bar code scanner
Installation
8 009 981/O078/16-08-2004
©
SICK AG · Division Auto Ident · Germany · All rights reserved
4-11
Table 4-2: Permissible range values for the polling reflectors
Explanation
When reflector polling is used, the CLV activates the laser diode with every 20th scan and
checks whether it detects the reflector. If the reflector is visible, the CLV repeats the
procedure after the next 20 scans. If the reflector is concealed by an object entering the
reading field, the CLV starts the reading pulse. This pulse ends when the CLV detects the
reflector again. Following this, the CLV repeats the above procedure. When the CLV is
switched on, the polling reflector must be visible before the first reading pulse can start. The
CLV does not output the data content of the polling reflector in "Reading" mode.
Note
This pulse mode is
not
suitable for applications where time is critical. The max. delay
between the reliable detection of the reflector and the start of the internal reading interval
is approx. 25 ms at a scanning rate of 800 Hz.
Adjusting the polling reflector roughly
1.
Connect the CLV to the CDB 420 or CDM 420 connection module and switch on the
power supply to the module (
see
Chapter 5.5.3 Connecting the power supply,
).
Fig. 4-11:
Line scanner: installation location of the polling reflector
15
°
Polling
reflector
white
blue
50 mm = 1.97 in / 144 mm = 5.67 in
Device type
Reflector
Range
CLV 420
white
100 to 320 mm (3.94 to 12.6 in) with
scanning frequency
≥
800 Hz
blue with film
420 to 500 mm (16.5 to 19.7 in) with
scanning frequency 1000 Hz.
450 to 650 mm (17.7 to 25.6 in) with
scanning frequency 1200 Hz
blue without film
450 to 550 mm (17.7 to 21.7 in) with
scanning frequency 1000 Hz.
500 to 700 mm (19.7 to 27.6 in) with
scanning frequency 1200 Hz
CLV 421
white
200 to 600 mm (7.88 to 23.4 in) with
scanning frequency
≥
600 Hz
blue with film
1000 to 1200 mm (39.4 to 47.3 in) with
scanning frequency
≥
600 Hz
blue without film
1200 to 1450 mm (47.3 to 57.1 in) with
scanning frequency
≥
600 Hz
CLV 422
white
blue with film
blue without film
not specified