Time-based IO basics
2.6 Technical implementation
High-precision input/output with Time-based IO
22 Function Manual, 08/2014, A5E33454822-AB
OIP model (application cycle factor >= 1)
The user program is started after the delay time. In PIP_Mode 0, the TIO_SYNC instruction
updates the process image. In the other modes, you start by updating the corresponding
process image partition of the outputs in the user program by calling the SYNC_PO system
instruction. As a result, the output data that was calculated in the previous network cycle will
become active during the next network cycle (T
O
). Next the corresponding process image
partition of the inputs is updated in the CPU by SYNC_PI. Processing starts after the data is
transmitted (for example, calculation of the time stamps).
Properties of the OIP model:
● The response time is longer than with the IPO model.
● It is one application cycle longer than permitted by the send clock.
This gives the application more time than with the IPO model.
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