Commissioning
EL6201
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Version: 2.2
5.4
Functionality of the AS-i master
The AS-i functionality is only mentioned briefly in this chapter. Further details can be found in the book
AS-
Interface
by Kriesl/Madelung, published by Hanser (essentially Chapter 4.1). Further information can also be
found on the website of the AS-Interface Association (
http://www.as-interface.net
).
5.4.1
AS-i status machine
First, an overview of the status machine is provided. Details of the individual operating phases can be found
below.
Fig. 144: Status machine overview
Initialization
Offline phase: During initialization, there is no AS-i data traffic.
Start-up
Detection phase
During detection phase, the AS-i master initially looks for existing slaves - irrespective of whether they are
currently projected or not. This phase is only exited once at least one slave has been found.
Activation phase
During this phase, the slaves that were found are activated depending on the operation mode:
• Protected mode: All detected and currently projected slaves are activated, if the I/O ID and ID code of
the detected slaves match the currently projected data.
• Configuration mode: All detected slaves are activated by the master.
Normal operation
Data exchange phase
Cyclic data exchange between the AS-i master and the activated slaves.
