Subject to reasonable modifications due to technical advances. © Pepperl+Fuchs, Printed in Germany
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Issue date: 17.4.2009
AS-Interface
Advanced Diagnostics for AS-i Masters
10.3 Offline Phase for Configuration Errors
The AS-i masters with advanced diagnostics offer the possibility to set them-
selves into the offline phase when a configuration error occurs and thus are able
to transition the AS-i network into a safe operational state. This ensures a quick
reaction to a configuration error and the host can be relieved from this task. If any
problems occur on the AS-i network, the AS-i masters can independently switch
the AS-interface into a safe state.
There are two different ways to parameterize the AS-i master for this feature:
• Any configuration error occurring on AS-i switches the master from regular
operation in protected mode into the offline phase.
• o . A list with the addresses of slaves that can potential initiate the off-line
phase is defined (list of offline slaves LOS).
The user can decide how the system should react to a configuration error on
AS-i. Thus, the AS-i master can be set to the offline phase for critical AS-i slaves,
whereas for less critical slaves only the error message is sent to the host, but
AS-i is still running.
Like the advanced diagnostics, the parameterization "offline phase on configura-
tion error" is also supported by "AS-i-Control-Tools"
(Command | Characteristics | Offline because of configuration error).
There are two options to reset the error message "OFFLINE BY LOS:
1. Deleting the complete LOS list on the affected AS-i network ("CLEAR ALL").
2. Power reset on the affected AS-i network.
10.4 Functions of the AS-i Fault Detector
10.4.1 Duplicate address detection
If two slaves on an AS-i network have the same address, a duplicate address ex-
ists. Since the master cannot communicate individually with these slaves any
longer, this is considered an error. Because the two slave replies interfere, it is im-
possible for the master to recognize the slave responses. This results in extreme-
ly unstable network behavior.
The duplicate address detection function is used to safely recognize a duplicate
address and to display it on the screen and in AS-i Control Tools.
A duplicate address causes a configuration error and is displayed on the screen.
Attention!
If a power reset occurs on the AS-i network 1 the complete double gateway will
be shut down.
Information!
Duplicate addresses can be recognized only on an AS-i segment directly connected to
the master.
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