Siemens SIMATIC MV500, Руководство по эксплуатации, Страница: 175 / 294

Process interfacing via an automation system (PLC, PC)
9.4 Control with FB 79
SIMATIC MV500
Operating Instructions, 03/2021, C79000-G8976-C494-05
175
Note
Requirement for optimum code quality
The code qualities are only output correctly when a program is set with the "Read code" task
with calibrated or uncalibrated verification according to ISO 16022. Otherwise, the quality
codes are not calculated when the code is read and cannot be output.
In the WBM, use the definition of the format string "Format text" under "Program > Result >
Program format text" to output the quality values for other selected verification types. The
quality values are then output according to the parameter settings along with the read result.
Note
Enable data recognition
If no data ID is entered, processing takes place but no data is transferred.
Note that no trigger is required for the "B#16#09" data identifier.
The following table gives you an overview of the contents and data types provided by the
data ID. This requires that the data identifier contains the position or quality characteristics.
The order of the code properties in the table is identical to the order of the code properties in
the data packet. If applicable, the result string is returned after the code properties.
Table 9- 38 Possible contents and data types of the data identifier
Data to be read consists of ... Data type
Position of the data matrix code
1)
•
X position
• Y position
• Roll angle
• Viewing angle
INT
Absolute quality characteristics
• Symbol contrast
• Print growth
• Axial non-uniformity
• Unused error correction
REAL
Quality characteristics as classes
• Symbol contrast
• Print growth
• Axial non-uniformity
• Unused error correction
• Overall grade
CHAR
1)
Viewing angle is only output for DMC quality = "Ambitious"