Siemens SIMATIC S7-1500 Function Manual page 17

Use of isochronous mode
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 3-1
With use of isochronous mode, the measured values are simultaneously acquired at the
various measuring points at fixed times. This yields the following sequence of operations:
● Continuously rotate the camshaft
● During the 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.
16
Measuring of camshafts
Isochronous mode
Function Manual, 10/2018, A5E43884988-AA