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How to

How to


Products: AS-B, Enterprise Central, Enterprise Server, AS-P, WorkStation, Virtual Project Servers
Functionalities: Trends
Product version: 3.2, 3.3, 2022
10/15/2020

Configuring the Trend Chart Time Zone

You display the time of the records in local time, server time, or in the time of a predefined time zone. By changing the time zone settings you make it easier to interpret the time stamp.

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​In a trend chart, you can present the records of a trend log in different time zones: local time or a predefined time zone.

​A time zone is a region on the earth that has a uniform standard time, usually referred to as the local time. Local time is the UTC time plus the current time zone offset for the considered location. Some time zones also have an offset called DST added during the summer period. The DST offset is typically +1 hour.

Before you set the time zone for a trend chart, you should consider these settings:

  • Computer clock settings​

  • Regional settings

A computer clock displays time that has been set manually or by synchronizing to a time server. The computer clock time shows local time. Regional time displays the time of the selected location. Asynchronous computer clock time and regional time are not uncommon and can cause, for example, unexpected time discrepancies between time stamps on received values and the computer clock time.

​To adjust the automation server time, time zone, and DST, you have to access the automation server through a WorkStation.

Local Time

A trend chart presented in Local time displays trend logs with time stamps adjusted for the client computer time zone.

The client computer does not consider the local time of the EcoStruxure BMS server where the variable is logged. The same variable logged on EcoStruxure BMS servers in different time zones is displayed with matching time stamps for corresponding values.

 
action_zoom_plus_stroke Local time zone, schematic
Figure: Local time zone, schematic

Predefined Time Zone

A trend chart presented in a predefined time zone displays trend logs in the time of the selected time zone regardless of where the EcoStruxure BMS server is located.

The same variable logged on EcoStruxure BMS servers in different time zones are displayed with adjusted time stamps for corresponding values. Use predefined time zone when you need to compare trend logs on EcoStruxure BMS servers located in different time zones.​

 
action_zoom_plus_stroke Predefined time zone, schematic
Figure: Predefined time zone, schematic

To configure the trend chart time zone mode

  1. In WorkStation, in the System Tree pane, select the trend chart you want to configure.

  2. In the trend chart view, on the toolbar, click the Open trend chart settings button

     
    action_zoom_plus_stroke
    .

  3. In the Trend Chart Settings dialog box, in the Time zone box, select a time zone to display the trend chart time stamps in:

    • Select Local time to display the time stamps in real time from the perspective of the client.

    • Select a predfined time zone to display the time stamps in real time from the perspective of the selected time zone.

  4. Click OK .

The x-axis is now set according to the selected time zone.

See Also

  • Time Zone Modes in a Trend Chart
  • Trend Chart Event Icons
  • Trend Chart Settings Dialog Box – Axes Tab