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4.4.8
Summary of the properties of IO routing
Read
Both IO controllers can read input submodules 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 to 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 submodule- and byte-oriented over the IO-Base user programming
interface.
Note
The IO controller for the process level may not write to output submodules in the process
image that are configured fully for write access by the IO controller for the control level.
Data status
Note the following about the data status of a submodule if two IO controllers write to it:
Note
The local data status of a submodule written to by two IO controllers only has the status
"GOOD" if the local status of both writes is "GOOD".
4.4.9
Configuring IO routing
Description
You configure the IO router in the "STEP 7 Professional (TIA Portal)" program.
In principle, the IO router is configured as follows.
Step
1
2
CP 1626
Operating Instructions, 11/2018, C79000-G8976-C434-03
Description
Configure the CP 1626:
As I-device for the IO controller of the control level.
•
As IO controller for the process level.
•
Configure the IO router
Operating hardware
4.4 IO routing
63
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