User Manual

Operating Reference
Trends
3
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Quality Attributes
The Trend View can display a number of state attributes, referred to as quality
attributes, along with the trend data. These enable you to identify problems with the
data point being recorded, and assist with the diagnosis of plant conditions. With
the reduced display, not all quality attributes can be displayed. In order to display
all quality attributes, limit the time period. Only the highest priority displays in the
Trend View if several states are active. The priority sequence in the previous
quality attributes table is read in descending order (highest to lowest priority). The
following table describes these quality attributes:
Quality Attributes
Symbol BACnet Status Description
DRIVER_FAILED
(Bit=1)
No connection Indicates that no connection exists to the
logged data point.
DRIVER_FAILED
(Bit=0)
Connected Indicates that the connection exists to the
data point.
ERROR_IN_LOG
Error Indicates an error in the Trendlog object.
T_LOG_ENABLE
(Bit=0)
Trend disabled Indicates that the Trendlog object is
disabled. Text display for the last known
value.
T_LOG_ENABLE
(Bit=1)
Trend enabled Indicates that the Trendlog object is
enabled.
T_PURGED
Buffer deleted Indicates that the buffer in the Trendlog
object is deleted.
T_ROLLOVER
Buffer full Indicates that the Trendlog buffer is full.
T_TIME_SHIFT
Time change Indicates that the time in the automation
station was changed (displayed in table
only).
LOG_INTERRUPTED
Power fail Indicates that the automation station has
been set to state Log_interrupted in the
trend buffer (for example: in the event of a
power outage, application program stop,
change of data point log type). This may
cause trend data from not being logged.
OUT_OF_SERVICE
(Bit=1)
Out of Service
switched on
Indicates that the Out of Service property is
switched on.
OUT_OF_SERVICE
(Bit=0)
Out of Service is
normal
Indicates that the Out of Service property is
switched off.
FAULT
(Bit=1)
Trendlog object
error
Indicates that a data point error exists in the
Trendlog object (values may not be usable
for follow-on evaluation).
FAULT
(Bit=0)
Return from
Trendlog error
Indicates that the data point error returns to
the normal state.
ALARM
(Bit=1)
In alarm state Indicates that the data point is in the alarm
state.
ALARM
(Bit=0)
Return from the
alarm state
Indicates that the data point has returned
from the alarm state.
OVERRIDDEN
(Bit=1)
Into override
(module)
Indicates that the data point on a module is
overridden.
OVERRIDDEN
(Bit=0)
Return from
overridden
(module)
Indicates that the data point's override on
the module is removed.