Siemens SIMATIC ET 200AL System Manual page 2174

Time-based IO basics
2.2 Time behavior of Time-based IO
Accuracy
Accuracy is crucial for the performance capability of Time-based IO.
The accuracy is a property of the TIO modules and indicates the deviation with which the
required response is achieved. For Time-based IO, the accuracy and reproducibility of the
response is in the millisecond range.
Response time
In addition to a very high accuracy, a minimum response time to an input event can result
depending on the configuration.
The response time is the time between the input event and the required output event.
For the minimum response time:
3 × application cycle T
16
APP
High-precision input/output with Time-based IO
Function Manual, 11/2019, A5E33454822-AC