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Building Technologies
Basic documentation: Communication via the KNX bus
CE1P3127en
HVAC Products
Appendix
30.08.2007
9 Appendix
9.1
Faults and errors
Various events cause faults and errors which then trigger error messages. This
document deals only with communication errors (see also the tables on the next
page).
Type of error
Examples
•
Failure
•
No bus power supply
•
System time failure
•
Setting error
•
More than 1 system time master defined
•
More than 1 room master defined in the same
"geographical zone"
•
Addressing error (e.g. two bus devices with the same
device address)
Device errors such as sensor errors, faults in the extension module or plant faults
such as fan overload, burner fault, dirty filters, frost conditions etc. are described in
the basic documentation.
9.1.1
Bus fault status message
All faults messages are distributed over the KNX bus. In this process, the fault with
the highest priority or, in the case of equal priority, the oldest fault, can be displayed
on the "Fault status message bus" operating page (access via Service level).
Main menu > Faults > Fault status message bus
The "Fault status message bus" operating page can be selected at all access
levels.
The operating lines on the "Faults" operating page, namely "Faults current" and
"Fault history" relate to the faults associated with that controller (i.e. not to faults
from other devices transmitted over the KNX bus).
The faults are arranged in order of priority. However, "Fault 1" (the "Fault 1" line
displayed on the RMZ790 and RMZ791 operator units or the "Fault 1" menu line in
the ACS menu tree) and the highest-priority fault are not necessarily identical.
Communication errors
Notes
Fault status message bus
Dev. addr: 0.2.5
>1 identical geogr. zone [1]
Fault no.: 5402
05.06.2003 17:46
