76 Unidrive M SI-PROFIBUS User Guide
Issue Number: 3
12.12 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 Control
Techniques drives only support one fault of this type, the active fault in Pr 10.020.
The PROFIdrive fault buffer mechanism is shown in Figure 12-3 on page 77.
980-
989
Defined parameters
list
Array(n)
Unsigned16
RO
Each PNU in the range contains an array
of PNUs and drive parameters available.
Only PNU980 is used and contains an
array of parameters starting with the
PROFIdrive PNUs (excluding PNU980-
989) followed by the drive parameters.
The array elements are assigned in
increasing sequence and consecutively.
If an element contains a value of zero then
the end of the list has been reached.
The array elements are read starting at 0
in increments of 59 elements
1001
Actual value
Unsigned16 RO
Control Techniques specific
1002 Unsigned32 RO
1003
Setpoint
Unsigned16 WO
1004 Unsigned32 WO
PNU Designation Data type Access Explanation
It is beyond the scope of this manual to provide information on the PROFIBUS DP-V1
message frame and PROFIdrive PNUs. For more information please refer to the
PROFIBUS web-site www.profibus.com or contact your local Control Techniques Drive
Centre.
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