Type BCR 23
Identification of load carrier by reading barcodes.
The figure shows a line scanner.
There are 3 basic models: line scanner, raster scanner & oscillating scanner.
The closer it is, the higher the resolution it can read.
The distance required can be due to a mechanical application issue, e.g.
how easy it is to mount. It is important to take into consideration which
width/height the reader needs to cover; the further away, the wider the
scanner line and therefore also the higher the raster/oscillation. You can
approximatetly say that the reader is covering about the same width/
somewhat lower height than the distance from the reader in mm.
Scanners communicate with each other via a CANBUS, while PROFIBUS
is required to communicate with the control system.
|Code resolution||0.5 mm|
|Code height||30 mm|
|Quality||ISO15416 grade B|
Scans the pattern with a single reading line. A line scanner is used when
the code moves past the reader, i.e. not good for stationary codes. The
orientation of the code shall be in “step orientation”, i.e. the lines of the
code are parallel to the direction of travel.
Scans the pattern with several lines at different heights. Is used when the
code is orientated as “fence orientation”, i.e. when the lines of the code
are at right angles to the direction of motion. There can be some small
variations in the positioning of the code.
Scans with a line that sweeps upwards and downwards is used in the
same situations as a raster scanner, where the code is “fence orientated”
or stationary, but in situations where it cannot guarantee the exact height
position of the code with respect to the reader. The height range is dependant
on the distance between the scanner and the barcode.