Examples Of Defects In The Marking Quality - Siemens SIMATIC MV500 Operating Instructions Manual

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3.2 Code verification
Here, a verification method suitable for DPM must be used. For open applications, a public
standard such as ISO/IEC 15415, ISO/IEC 29158 or AS9132A is normally used, whereby
ISO/IEC 29158 has become the preferred standard in recent years.
For applications with demanding lighting conditions, use ISO/IEC 29158. To obtain an ideal
image of the code to be verified, automatic exposure control is used here, in contrast to all
other verification standards.
Siemens DPM
For closed applications with a focus on checking the marking quality, Siemens DPM
verification is the best choice. Siemens DPM is based on the quality features of ISO/IEC 16022
and AS9132 Rev. A, can be configured very flexibly to test markings applied with a variety of
marking methods on different materials.
Measuring the marking
Each marking is measured based on the quality characteristics defined in the relevant
verification process and assigned to a quality level. Deviations in the quality grade can usually
be attributed to the following causes:
• Changed marking parameters or errors in the marking device
• Changed material concepts or surface structure
• Parts incorrectly secured or traced
• Changes in a disturbed environment such as oil or light on the part
Provided with the data of the verifier, the production line remains operational because
necessary maintenance or modifications to improve the marking can be performed before
the markings become unreadable.
3.2.3.3

Examples of defects in the marking quality

The following pictures show examples of defects in the marking quality:
Figure 3-4
Figure 3-5
48
Incorrect or non-uniform cell size in the marking
Incorrect or non-uniform cell position in the marking
Operating Instructions, 03/2021, C79000-G8976-C494-05
SIMATIC MV500