Definition View Trend Items Table - Metasys - LIT-12011942 - "" - Software Application - Metasys Open Data Server - 10.1

Metasys Open Data Server Help
Product
Building Automation Systems > Databases and Data Servers > Metasys Open Data Server
Document type
User Guide
Document number
LIT-12011942
Version
10.1
Revision date
2019-10-14

The Trend Items table appears at the bottom of the Definition view. The Trend Items table displays the list of the Trend Study’s trend items.

Table 1. Trend Items Table

Button

Name

Description

Historical Trend Icon

Indicates the trend was selected from the ODS Historical Database folder.

Add

Opens the Select Item dialog box and allows you to add trend items to the Trend Study. This button only enables when the view is in edit mode.

Note: All items and navigation trees appear in the Select Item window; however, you can only select trends. All other items appear dimmed.

Remove

Allows you to remove a trend item from the Trend Study. This button only enables when the view is in edit mode.
 

Name

Displays the name of the trend item.
 

Reference

Displays the trend item’s reference information.
 

Aggregate Function

Allows you to select the aggregate function to use on the trend sample data (NONE, Average, Minimum, Maximum, Standard Deviation, Range, Sum, and Variance). You can sample the same point for different aggregate functions and display them on a single chart. Aggregate functions group multiple values together to construct a single value that has significant meaning or measurement. Descriptions of available aggregate functions are as follows:

  • Average: the sum of values divided by the total number of values
  • Minimum: the lowest value of a set of values
  • Maximum: the highest value of a set of values
  • Standard Deviation: the amount of variation or dispersion of a set of data values
  • Range: the difference between the lowest and highest values on a particular scale
  • Sum: the addition of two or more numbers
  • Variance: the quantity equal to the square of the standard deviation

The aggregate functions of the trend study apply to information in the Historical Data at the ODS server and do not apply to data in the NAE buffer.
 

Aggregate Interval

Specifies the time, in minutes, over which the aggregate function should be applied (for example, 60 for an hourly calculation, or 1,440 for a daily calculation).
 

Plotting Style

Allows you to select the plotting method for the trend item.

  • Continuous - straight line between data samples. Continuous plotting connects samples with the shortest possible line, giving an appearance of a set of diagonal ramps as samples change value.
  • Discrete - line stays at the same value until the next data sample is taken (good for binary data). Discrete plotting has 90-degree angles at the time when samples change value. The chart appears to be a series of steps.