Siemens SIMATIC MV500, Руководство по эксплуатации, Страница: 62 / 294

Image processing
3.2 Code verification
SIMATIC MV500
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Operating Instructions, 03/2021, C79000-G8976-C494-05
• Unused error correction:
Proportion of error correction information not used for correction of the read result.
• Angle of distortion:
Difference between the two solid edges of the data matrix and the vertical edges
measured in degrees.
Table 3- 6 Assignment of the numeric grade of Siemens DPM to the quality grades
Quality features
(abbreviation)
Quality grades Comment
4 3 2 1 0
Cell size (CS_) ≥ 10 ≥ 9 ≥ 7 ≥ 5 < 5 In pixels
Center offset (CO_) ≤ 2.5 ≤ 5.0 ≤ 7.5 ≤ 10.0 > 10.0 Without unit
Size offset (SO_) ≤ 2.5 ≤ 5.0 ≤ 7.5 ≤ 10.0 > 10.0 Without unit
Cell modulation (MOD) ≥ 90% ≥ 80 % ≥ 70 % ≥ 60 % < 60 % --
Border match (BM_) ≥ 95 % ≥ 90 % ≥ 85 % ≥ 80 % < 80 % --
Symbol contrast (SC_) ≥ 70 % ≥ 55 % ≥ 40 % ≥ 20 % < 20 % --
Axial non-uniformity (AN_) ≤ 6 % ≤ 8 % ≤ 10 % ≤ 12 % > 12 % --
Print growth (PG_) ≤ 10 % ≤ 20 % ≤ 30 % ≤ 40 % > 40 % --
Unused error correction (UEC) ≥ 62 % ≥ 50 % ≥ 37 % ≥ 25 % < 25 % Code words in ECC 200
Angle of distortion (AOD) ≤ 2 % ≤ 4 % ≤ 6 % ≤ 7 % > 7 % --
3.2.5.6 Graphical support for analysis of verification errors
Searching for cause of marking problems
The information used by the reference decoder can be displayed to simplify troubleshooting
for marking problems.
You enable the details view in the WBM under "Settings > Options > Extras > Verification >
Verification details". You can read out the results in the user interface if the display of the
"Features" is enabled in the result display and via the "Monitor" link on the device start page.
The displayed information contains:
•
The grid lines by which the cells are separated.
• The incorrectly marked cells (shown in red).
• The correctly marked cells (shown in green).
Note
Quality parameters that cause lowering of the grade are not displayed
The identification of the incorrectly marked cells only takes into account cells that were
recognized as being incorrectly set based on the error correction information. Other
quality parameters that cause lowering of the grade, such as inadequate modulation or
errors in the quiet zone, are not displayed.