Siemens SIMATIC S7-1500 Function Manual page 15

What is isochronous mode?
Advantages of isochronous mode
The use of isochronous mode enables high-precision control loops.
● Optimized control loops through constant, calculable dead times
● Determinism, reliable reproducibility of reaction times
● Consistent (simultaneous) reading in of input data
● Consistent (simultaneous) output of output data
● Oversampling for processing of fast processes thanks to higher sampling rates than the
send clock permits
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Isochronous mode
Function Manual, 10/2018, A5E43884988-AA