Dotcodes; One-Dimensional Codes - Siemens SIMATIC MV500 Operating Instructions Manual

• The error correction codes (in other words, the lower part of the barcode) must not be
covered.
• At the minimum bar width, each symbol column requires 51 pixels. Along with the four
start and stop patterns, the width of the code with n code columns is at least:
Width = 51 x (n + 4) pixels.
Due to the limited image resolution, codes can be read as follows:
– SIMATIC MV500 S up to 50 code lines and up to 8 code columns.
– SIMATIC MV500 H up to 85 code lines and up to 17 code columns.
– SIMATIC MV500 U up to 90 code lines and up to 29 code columns.
– SIMATIC MV500 X up to 90 code lines and up to 30 code columns.
3.1.2.5

DotCodes

The recognition process of the optical reader allows reliable and fast reading of printed dot
codes of good quality.
Range of application
• The range of image sizes is from 4 to 40 pixels per cell. The range is static.
• The cells are isolated.
• The distortions are minimal, for example due to installation of the optical reader at an
angle.
• There are no or only a few foreign objects in the area of the code.
• There are no interference patterns (grooves, granularity) in the area of the code.
• Fluctuations in contrast are slight.
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 the code type "Code 39" is not supported.
– To read this code type with the optical reader, use code type "Code 39".
– To obtain the original text with the additional "Full ASCII" characters, you need to post-
SIMATIC MV500
Operating Instructions, 03/2021, C79000-G8976-C494-05
edit the textual read result.
Image processing
3.1 Code reading (1D/2D codes)
41