Alarm faults and quality indicators
Alarm faults and their qualities appear in the
Quality Details
row in the Details
pane of an alarm table. An alarm indicates good quality if all alarm conditions (High High, High, Low, Low Low, ROC Positive, ROC Negative, Deviation High, Deviation Low, TRIP, and TRIP_L) are in good quality. Fault | Cause of Fault | Quality Indicator | Affected alarm conditions |
No fault | N/A | Good | All |
Status from controller not read yet | Abnormal Conditions | Bad | All |
Instruct fault only (specific fault not set) | Configuration | Bad | All |
In faulted | Configuration | Bad | All |
Severity invalid | Configuration | Bad | All |
Alarm limits invalid | Configuration | Bad | High High, High, Low, Low Low |
Deadband invalid | Configuration | Bad | High High, High, Low, Low Low |
ROC Positive limit invalid | Configuration | Bad | ROC Positive |
ROC Negative limit invalid | Configuration | Bad | ROC Negative |
ROC period invalid | Configuration | Bad | ROC Positive, ROC Negative |
Old Logix firmware | Abnormal Conditions | Bad | All |
Controller in Program mode | Abnormal Conditions | Bad | All |
Major controller program fault (recoverable) | Abnormal Conditions | Bad | All |
Communication failure (last value known) | Abnormal Conditions | Bad | All |
Communication failure (no last value known) | Abnormal Conditions | Bad | All |
Connection with controller lost | Abnormal Conditions | Bad | All |
Major controller program fault (unrecoverable) | Abnormal Conditions | Bad | All |
Failed to subscribe to controller | Abnormal Conditions | Bad | All |
Detected hazard of overwriting old notifications in Alarm Log | Abnormal Conditions | Bad | All |
Arithmetic overflow | Abnormal Conditions | Bad | All |
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