Operating Instructions

Troubleshooting
Siemens Building Technologies, Inc. 85
Troubleshooting
Reading Faults
• OK FAULT (r0052, bit 3) is a read-only fault status point (0=OK,
1=Fault).
• LAST FAULT (r0947(0)) shows the code for the most recent fault.
Fault history displays according to Figure 40, where:
F1 = The first active fault (not yet acknowledged)
F2 = The second active fault (not yet acknowledged)
F1e = The occurrence of the fault acknowledgement for F1 and
F2.
This moves the value in the two indexes down to the next pair of
indexes, where they are stored. Indexes 0 and 1 contain the active
faults. When faults are acknowledged, indexes 0 and 1 are reset to
0.