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With the update of the Profinet Stack from version 2 .2 to version 2. 3, there was a significant change in the handling of the so-called IO Consumer States (IOCS) and IO Provider States (IOPS). So far, the status flags have been checked and handled within the protocol stack, with the new standard this task has been outsourced from the protocol stack for performance reasons. This step was required with the requirement of a minimum bus cycle of 250 microseconds. Responsibility for the status flags was assigned to the application. Now the status flags are mapped into the process image so that the application can access the status values.
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