Troubleshooting and fault elimination
8-3
48XX/49XXSHB0399
8.2 Fault analysis with the history buffer
With the history buffer, faults can be traced. The fault messages are stored in the
history buffer in the order of their occurrence.
8.2.1 Structure of the history buffer
( The history buffer has eight memory locations, which can be retrieved
- under C065, C066 and C067 at the operating unit
- via the LECOM interface under codes C161 to C168 for TRIP messages.
( The first memory location is written only after the elimination or
acknowledgement of the active fault. The eighth from last fault is eliminated
in the history buffer and can no longer be read.
( The memory locations 1-8 contain information about the last to eighth from
last fault.
Code C0168
C063 Active message
C066 Active warning
C067 Active TRIP
C161 Memory location 1
C162 Memory location 2
C163 Memory location 3
C164 Memory location 4
C165 Memory location 5
C166 Memory location 6
C167 Memory location 7
C168 Memory location 8
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