User Guide

8
Trends
Working with Trends
190
Siemens User Guide Version 2.1 A6V10415471_en_a_21
Building Technologies 2015-07-15
8.4.7 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_INTERRUPTE
D
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.