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Operating hardware
4.3 IO routing
Note
The process controller user program always writes byte-oriented on the IO Base user
programming interface.
Bits 100.0 and 100.1 are, however, replaced by the bits of the IO controller for the control
level by the IO router.
4.3.8
Summary of the properties of IO routing
Read
Both IO controllers can read input modules of the process device at the same time.
Write
An output bit can only be written by one of the two IO controllers.
Two IO controllers can nevertheless write different bits of the same output byte.
Write/read access by the IO controller for the process level to the input/output data of the
process image is module- and byte-oriented over the IO Base interface.
Note
The IO controller for the process level may not write to output modules in the process image
that are configured fully for write access by the IO controller for the control level.
74
Operating Instructions, 02/2017, C70000-G8976-C218-08
CP 1604 / CP 1616
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