Siemens CP 1626 Operating Instructions Manual page 58

Operating hardware
4.4 IO routing
Data exchange
The data exchange between the input and output data of the IO controller for the process
level and input and output data of the IO controller for the control level is established
automatically by the IO router.
Input data is transferred only submodule-oriented.
If you also use the function for writing outputs bit-oriented, the data from the process
controller user program is "mixed" with the data of the IO controller for the control level
according to the configuration; see Section "Examples of reading and writing (Page 59)".
Note on the IO Base user programming interface
To support IO router functions, there are also two diagnostics services available
(PNIO_CTRL_DIAG_CONFIG_IOROUTER_PRESENT,
PNIO_CTRL_DIAG_CONFIG_OUTPUT_SLICE_LIST). Using these services, all output areas
that can be written by the process controller user program can be identified.
These functions are only available for the process controller.
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Operating Instructions, 11/2018, C79000-G8976-C434-03
CP 1626