Siemens SIMATIC MV440 Operating Instructions Manual page 45

Figure 4-3
It is, however, important that the measuring procedure and marking quality are suitable for
the marking method used. With direct part marking (DPM), the data matrix code is applied
directly to the surface of the object: In contrast to the standards of DPM verification,
conventional standards can lead to incorrect alarms or to serious marking errors being
overlooked.
Depending on the particular requirements, there are several test standards. Data matrix
codes on labels can be tested with test systems according to ISO/IEC 16022. For directly
marked parts, however, a verification tailored to this purpose is necessary.
SIMATIC MV420 / SIMATIC MV440
Operating Instructions, 04/2013, A5E02371045-06
Sequence involved in marking quality when using a verifier
Image processing
4.2 Code verification
43