User Guide

Trends
Trends Reference
7
219 | 393
Siemens
User Guide Version 3.0
A6V10415471
Building Technologies
2017-11-30
Quality attributes:
With the reduced display, not all quality attributes can be displayed. In order to
display all quality attributes, limit the time period.
7.2.5.6 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. 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.