Lenze Drive PLC Developer Studio 9300 Servo PLC (V8.x) - Manual (Page 119)

9300 Servo PLC
Appendix
3−17
L
9300 Servo PLC EN 5.0
3.5.5 Fault analysis via the fault memory
The fault memory of the PLC consists of 8 memory locations which store the following information
about the active fault and the 7 previous faults in their chronological order of occurrence:
·
No. of system error message ( ^ 3−8)
·
Response to the fault (warning, message, TRIP, etc.) ( ^ 3−8)
·
Time of occurrence (referred to power−on time of the PLC, e.g. "1234567 s")
·
Frequency of successive occurrence
The fault memory information is stored under codes C0168/x ... C0170/x:
C0168 C0169 C0170 Subcode Contains information about
No. of the
system error message
and response
Time
of occurrence
Frequency
of successive
occurrence
1
Active fault
2
Last fault
3
Last but one fault
4
Last but two fault
5
Last but three fault
6
Last but four fault
7
Last but five fault
8
Last but six fault
Tip!
The fault memory works according to the principle of a shift register:
If the current fault is no longer active or has been acknowledged by a TRIP−RESET, all information
is automatically shifted up one subcode in the fault memory.
·
The information concerning the previously active fault is now stored under subcode 2.
·
The information concerning the previous last but six fault is deleted from the fault memory and
cannot be retrieved any longer.
Note!
·
If several faults causing different responses occur simultaneously:
– Only the fault causing the highest−priority response is entered into the fault memory
(priority = TRIP
→ message → FAIL−QSP → warning).
·
If several faults causing the same response occur simultaneously (e.g. 2 messages):
– Only the fault occurring first is entered into the fault memory.
·
If a fault occurs several times in succession:
– Only the time of the last occurrence is entered into the fault memory.