Leuze
electronic
Device Description
Leuze electronic
Technical description BCL 90
17
T
N
T 35/
7-
24V
3
Device Description
3.1
The Function of the Device
The BCL detects bar codes using a scan line and decodes them. The BCL transmits the data via the
serial host interface to a host/PC for further processing. An overview of the functions of the BCL is
shown in Figure 3.1.
Figure 3.1: Block diagram: functions of the BCL
The BCL offers two decoders:
• the CRT decoder for decoding bar codes with small code heights, of bar codes with damaged or
dirty print and for reading extremely tilted bar codes (azimuth angle)
• the tried-and-tested standard decoder of the BCL series
The BCL derives from the read processes useful diagnosis data which can be transferred to the host,
and also contains operation data that can be called up. The read quality can be checked in the oper-
ating mode percentage evaluation.
The BCL needs a suitable trigger to start a read process as soon as an object is in the reading field.
The trigger causes a time window ("scan gate time") to open in the BCL for the read process. In the
basic setting, triggering takes place through an external reading cycle sensor. Alternatively, free-os-
cillating operation or a command via the host interface can also serve as triggers.
Four LED status displays provide optical information on the current operation status.
When triggered externally through a sensor, the switched input "SE 1" informs the BCL when it should
start reading. As an alternative to the autofocus function, focus positions can be switched event-driven
through the five switched inputs "SE 2 … SE 6", and the inputs "SE 5" and "SE 6" can additionally be
assigned special functions. The four switched outputs "SWO 1 … SWO 4" can be assigned various
output functions of the event status and activate external devices, e.g. a PLC.
"SE 1"
"SE 2"
"SE 3"
"SE 4"
"SE 5"
"SE 6"
"SWO 1"
"Host"
"Service "
"SWO 2"
"SWO 3"
"SWO 4"
Scanner
Decoder
Interface
V
S
BCL 90
Terminal
Operation
Parameterization
etc.
HOST
Further processing of
the read result
Status display
e.g. Device Ready
e.g. Good read
e.g. No read
e.g. Match 1
Light barrier
Reading cycle
Signal*
Focus position
switching
Trigger one-shot
Path length increment
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