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The following image shows the default form to edit a trending.Image Removed

...

* indicates a required field.

Following configuration items dealing with the recording of the data:

Field

Description

Enabled

Enable (default) or disable the trending.

A disabled trending

 

When a trending is disabled:

  • It does not log any values

until it is enabled again.Name*The name of the trending (mandatory)

  • .

  • Its name is displayed in italic font.

  • In the Trending app / plot view, the trending name is extended by " - disabled"

  • In the Metering app / calculation chart, the trending name is extended by " - disabled"

Name

Name of the trending.

Description

Trending description.

Item *

Item

Select an item from the item tree. The trending logs the values of this item.

Type *

Type

Type of the trending

(Mandatory).

:

  • All:

Log all

  • All value changes of the item are logged. 

  • Average:

 Log the

  •  The average value of the item

. 

  • over a given period of time is recorded.

  • COV:

 Log the

  •  The value of the item is logged when it

changes. 

  • exceeds a given absolute or relative threshold.

  • Delta:

 Log the delta (

  •  The difference

)

  • of the

item's value

  • current value to the previous value is recorded in intervals of the given time period. 

  • Max:

 Log the

  •  The maximum value of the item

. Meter sampling: Log data in a predefined interval between 5 minutes and 1 hour

  • over a given period of time is recorded.

  • Min:

 Log the

  •  The minimum value of the item

. 

  • over a given period of time is recorded.

  • Pulse:

 Log the

  •  The number of received item values.

  • Sampling: For each interval of the given time period the current value of the item is logged.

Sampling: Log data in a definable interval.

Notes:

  • For items of data type String, only the trending types All and Sampling are available. (since 4.2.2010)

  • Depending on the selected trending type, additional form fields may

appear.

  • be shown.

Schedule at full hour

Enabled: The recording schedule starts at the full hour and repeats at the given interval.

Disabled: The recording schedule starts when the trending is saved or the server has been restarted and repeats at the given interval. 

Max age [days]

Max age of trending data

Trending data older than the given age in days will be deleted.

0 (default): Ignore age of data.

Select a number how many days to keep the data of the trending. Older data will be deleted.

Interval [s]

Interval [min]

Time interval in seconds.

Time interval in minutes.

COV type

In a COV trending,

Absolute (default):

 Defines

 Specifies the threshold

value

as absolute value.

Percentage:

 Defines

 Specifies the threshold

value

as relative value.

Threshold

Log data in the trending when the change of value is grater than the threshold

In a COV trending, when the threshold is exceeded then the current item value is logged.

Scaling

Disabled (default):

Scaling is turned off

No scaling of the item value.

Enabled:

Scaling is turned on and a scaling function appears for configuration

 The item value is linearly scaled according to the given coefficients before being logged. Additional form fields appear.

Min-Max Validation

Disabled (default):

Validation is deactivated

No validation.

Enabled:

Validation is activated. Values

 Values outside the given min-max range are ignored and not logged

to the trending

. Additional form fields appear.

Min allowed value

Minimum value.

Max allowed value

Maximum value.

Time program

Disabled (default): Time program is

deactivated

disabled.

Enabled:

Time program is activated. The trending logs data in the period defined by Start date/time and End date/time

 Data is only logged during the specified period of time.

Start date/time

Start of time

range

program.

End date/time

End of

time range.

time program.

These fields control how the data gets displayed. The configuration of these fields are the default ones when the data gets shown as plot or table. In the plot or table you can change these settings, but each time you open it again, the default values will be taken as preconfiguration of the plot or table.

Field

Description

Chart

Graphical presentation type of the trending data.

Range

Default time range

to view

in

chart

plot view: Day, Week, Month, Year, Custom.

Color

Color

Trending color.

of the graph.

Decimals

Specifies the precision of values (trending and trendline) shown in table view or plot view.

Select the number of decimals to show:
0, 1 (default) to 6, All

Y axis scaling

Dynamic (default):

The system will define the best scaling depending

Based on the

values. This is a relative representation of the values

displayed values, the range of the Y axis is dynamically adjusted.

0-based:

All trending values appear in an absolute representation

The X axis intersects the Y axis at 0.

Y axis label

Label of the

y

Y axis.

Aggregation

Enabled (default):

Aggregated values appear in the chart. The aggregated value is the average value for a certain

 Values are average-aggregated in order to display a well-readable number of values, e.g. 1 value per hour in a day period.

Disabled:

All values appear

 The recorded raw values are shown in the

chart - without aggregation

plot.