Fault Buffer - Leroy-Somer digitax st User Manual

11.12

Fault Buffer

The fault buffer provides a list of acknowledged and unacknowledged faults, the buffer
contains eight elements numbered from 0 to 7, of which the first element (0) contains
the active fault (if any). The remaining elements (1 to 7) contain the acknowledged faults
in reverse order of occurrence, and therefore element 1 is the most recent
acknowledged fault (last fault) and element 7 is the oldest acknowledged fault (first
fault).
Acknowledged faults are faults which have been cleared by resetting the drive when a
fault is acknowledged; the fault number will be placed in element 1 of the buffer, any
existing recorded faults will be moved up (numerically) one element.
If element 7 already contains a fault number then this will be over-written with the value
from position 6, the existing fault number is subsequently lost.
Unacknowledged faults are faults which have not been cleared, currently LEROY-
SOMER drives only support one fault of this type, the active fault in Pr 10.20.
The PROFIdrive fault buffer mechanism is shown in Figure 11-3.
Figure 11-3 DP-V1 Fault Buffer
Read
PNU 944
Fault Message
Counter
Fault
Reaction
SM-PROFIBUS DP-V1 User Guide
Issue : a
Fault Present
(Status Word bit 3=1)
+1 0 – Active fault
1 – Most recent acknowledged fault
2 –
3 –
4 –
5 –
6 –
Fault
Message
7 –
www.leroy-somer.com
Read
PNU 947
Fault Number
Unacknowledged fault
Acknowledged faults
Fault
Acknowledged
fault moves to
position 1
Any existing
acknowledged
faults move
down one
position
Any previous
fault in position
7 is lost
71