Table of Contents
Advertisement
3.2
Code verification
3.2.1
Overview
Verification
The readability of a 1D or 2D barcode will never be better than at the time the barcode
leaves the marking device. With the help of code verification, it is possible to make sure that
the markings are correctly applied during the marking process and that readability is good
enough so that it will remain ensured throughout the entire life cycle. 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 optical reader. A pure optical reader (without verifier) outputs only the
"read/not read" result. This means the optical reader does not provide any trend data to the
marking device.
Figure 3-2
The verifier, in contrast, assigns a quality grade from 4 to 0 to the readable marking. These
levels provide information to the marking device to detect when preventive maintenance is
required. Based on this knowledge, maintenance can be planned at a suitable time before
the device actually becomes defective.
SIMATIC MV500
Operating Instructions, 05/2019, C79000-G8976-C494-02
Course of marking quality when using a reader without a verifier
Image processing
3.2 Code verification
41
Advertisement
Table of Contents
