Image processing
4.2 Code verification
SIMATIC MV420 / SIMATIC MV440
42 Operating Instructions, 04/2013, A5E02371045-06
4.2 Code verification
4.2.1 Overview
Verification
A generally accepted axiom in the implementation of traceability says: The data matrix code
will never be better than it was at the time it left the marking device.
During the marking process, verification ensures that the marking is correctly applied.
Verification makes sure that corrections can be made to the marking procedure before it
leaves a range of tolerance and produces unusable or incomplete markings.
Marking quality
To recognize and ensure the readability and quality of a marking, a verifier is required
instead of a pure code reader.
A simple code reader outputs the result read or not read and does not provide any data to
identify trends relating to the marking device or the operator or to inform the operator of
potential read errors.
0DUNLQJTXDOLW\
1XPEHURIPDUNHGSDUWV
1RWUHDG
Figure 4-2 Sequence involved in marking quality when using a reader
The verifier assigns a quality grade from 4 to 0 to the readable markings. This grade informs
the marking device or operator when preventive maintenance is required. Based on this
knowledge, maintenance can be planned at a suitable time before the machine actually
becomes defective.
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