Siemens SIMATIC ET 200AL, System Manual

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Functions
5.7 Isochronous mode
PROFINET with STEP 7
Function Manual, 05/2021, A5E03444486-AL
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Example: Measuring at multiple measurement points with isochronous mode
Automation task
A camshaft production process requires precise measurement of the camshafts for quality
assurance purposes.
Feature
For this purpose, a component is needed that can synchronously measure the positions and
displacements of the cam during a rotation of the camshaft.
Solution
Figure 5-71 Measuring of camshafts
With use of isochronous mode, the measured values are simultaneously acquired at the
various measuring points at fixed times. This results in the following workflow:
•
Continuously rotate the camshaft
• During continuous rotation, synchronously measure the positions and cam displacements
• Process the next cam shaft
Thus, during a single rotation of the camshaft, all the positions of the camshaft and the
associated measured values (red) are measured synchronously. The machine cycle time
improves with the same or better measuring accuracy.
Advantage and benefits
The time required for measurement is reduced.