Image processing
3.1 Code reading (1D/2D codes)
SIMATIC MV500
42 Operating Instructions, 03/2021, C79000-G8976-C494-05
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 error correction of this code type.
• Since an upside-down Pharmacode cannot be detected automatically, select the code type
"Pharmacode (0°)" or "Pharmacode (180°)", depending on requirements.
• 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 50° and 90°.
• The codes must not be printed on a curved surface.
• The quiet zone around the code must be undisturbed.
• Code and background must have a homogeneous brightness.
• The following limit values for the bar width must not be exceeded:
– Code 39: 8 pixels
– Code128: 12 pixels
– Int. 2/5: 5 pixels
– EAN 13/UPC-A/UPC-E/EAN 8: 12 pixels
– Code 93: 14 pixels
– Codabar: 9 pixels
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