Time Behavior Of Time-Based Io; Time Behavior Of Standard Technology - Siemens SIMATIC ET 200AL System Manual

Time-based IO basics

2.2 Time behavior of Time-based IO

2.2 Time behavior of Time-based IO
2.2.1

Time behavior of standard technology

The time behavior of the inputs/outputs depends on the following factors for standard
technology:
● CPU program (program structure)
● Bus cycle times (fieldbus, backplane bus)
● Cycle time of the I/O modules
● Internal cycle time of sensors/actuators
A deterministic statement as to
● when an input event (e.g., sensor signal) has taken place
● when the output event has an effect on the input event (e.g., output switches)
will become inaccurate due to the time factors listed above.
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High-precision input/output with Time-based IO
Function Manual, 08/2014, A5E33454822-AB