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Image processing
3.1 Code reading (1D/2D codes)
3.1.2.6
One-dimensional codes
The recognition process of the optical reader allows reliable and fast reading of printed one-
dimensional codes of good quality.
● If the code type has a checksum, the checksum is also transferred in the read result
(text).
● Do not work with variable string lengths with "Interleaved 2/5" or "Code 39".
To avoid incomplete codes being read, set the "Number of bars" parameter to "Saved" in
the decoder options ("Program > Decoder step > Decoder options").
● The "Full ASCII" coding of "Code 39" code type is not supported.
– To read this type of code with the optical reader, use the "Code 39" code type.
– To obtain the original text with the additional "Full ASCII" characters, you need to post-
Reliable reading of Pharmacode
● Because of the simple structure of Pharmacode, set the following parameters to
"Dynamic" in the decoder options ("Program > Decoder step > Decoder options").
– Height
– Length
– Number of bars
– Min. quiet zone length
– Sample spacing
● Save the program before reading. For the program to be successfully saved, the
Pharmacode to be saved must have both narrow and wide elements. This avoids reading
errors due to the absence of the error correction of this code type.
● Since an upside-down pharmacode cannot be detected automatically, select the code
type "Pharmacode (0°)" or "Pharmacode (180°)".
● Standard code generators allow a maximum of 63 bars for a Pharmacode. The integrated
Pharmacode decoder is therefore also limited to maximum of 63 bars per code.
Range of application
Boundary conditions:
● The codes can have any alignment in the image.
● The code can be printed both dark on a light background and light on a dark background.
● Codes with a height of 25 pixels and height/length ratio ≥ 0.15 are read.
● The viewing angle of the sensor to the surface can be between 80° and 90°.
● The codes must not be printed on a curved surface.
● The quiet zone around the code must be undisturbed.
38
edit the textual read result.
Operating Instructions, 05/2019, C79000-G8976-C494-02
SIMATIC MV500
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