Time-based IO basics
2.6 Technical implementation
High-precision input/output with Time-based IO
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Function Manual, 11/2019, A5E33454822-AC
IPO model (application cycle factor = 1)
The user program is started after the delay time. Start by updating the corresponding
process image partition of the inputs in the user program by calling the SYNC_PI system
instruction. Processing is started next (for example, calculation of the time stamps). The
corresponding process image partition of the outputs is updated at the end of the user
program in the CPU by SYNC_PO.
Properties of the IPO model:
●
Supports shorter response times
●
The application cycle must not be greater than the send clock.
This gives the application less time than with the OIP model.
Summary of Contents for SIMATIC ET 200AL
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