Isochronous Applications - Siemens SIMATIC ET 200AL System Manual

Functions
5.1 Isochronous mode
5.1.3

Isochronous applications

Example: Isochronous measurement at several measuring points
QC requires precise measurement of dimensions within a camshaft production process.
Figure 5-2
Isochronous workflow
By using the system property "isochronous mode" and the associated simultaneous
measured value acquisition, measurement can be performed continuously and the time
required for measurement is reduced. Resultant workflow:
● Continuous turning of the camshaft.
● During the continuous turning, measure the positions and cam excursion synchronously.
● Process the next camshaft.
All camshaft positions and the corresponding measured values (red) are measured
synchronously within a single rotation of the camshaft. This increases machine output and
maintains or enhances precision of the measurement.
64
Measuring of camshafts
PROFIBUS with STEP 7 V13
Function Manual, 12/2014, A5E03775446-AC