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How to

How to


Products: Automation Server, AS-B, Enterprise Central, Enterprise Server, AS-P, Virtual Project Servers
Functionalities: User Management
Product version: 2.0, 2.1, 3.0, 3.1
10/30/2018

Adding a Unit Conversion Exception

You add unit conversion exceptions to override the selected unit conversion system. If you have selected to display units as configured in object, the unit conversion exceptions feature is disabled.

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The EcoStruxure Building Operation software supports both the SI metric system and the US Customary System for units of measurement.

There are four optional ways to display units:

  • As MS Windows

  • As configured in object

  • International System of Units (Metric)

  • United States Customary Units (US)

For example, the temperature 42,82 °C is stored in the EcoStruxure Building Operation software. A WorkStation on an operating system with the US Customary System converts the temperature and displays it as 109.08 °F.

As MS Windows

By default, values are converted into the unit given by the regional settings of the operating system.

As configured in object

Units displayed as configured in the object means that no conversion is done. The unit the user selected when creating, for example, a trend log is displayed regardless of regional settings. When this option is selected, the unit conversion exceptions feature is disabled.

International System of Units (Metric)

Values displayed in International System of Units means that the values are converted into metric unit regardless of the unit the object was given when created.

United States Customary Units (US)

Values displayed in United States Customary Units means that the values are converted into US unit regardless of the unit the object was given when created.

When you select a different unit system, the values are converted immediately.

Values are not converted in the following WorkStation screens:

  • Alarms and trend logs in wizards

  • Customized alarm views

  • Alarm and trend log properties panes

Delta Temperature Conversion

Important:

  • The EcoStruxure Building Operation software converts the unit of a variable independent of its context. To correctly convert a delta temperature, the unit of the delta value must belong to the unit category Temperature Diff.

The conversion between ​Celsius and Fahrenheit or ​Fahrenheit and Kelvin is not a simple ​coefficient (multiplier) like other unit categories as for example length, pressure, currency, and Energy. Due to the conversion formula when for example converting an absolute ​Fahrenheit temperature to Celsius​, T​°F=T​°C x 9/5 + 32, ​ you have both a multiplier and an offset to consider. To correctly convert a delta temperature from ​​Fahrenheit to ​Celsius​ you have to use the formula ΔT°F = 9/5 ΔT°C.

For more information, see Delta Temperature Conversion .

To add a unit conversion exception

  1. In WorkStation, in the System Tree pane, select the EcoStruxure BMS server you want to configure.

  2. Click the Control Panel tab.

  3. Click Domains .

  4. In the Domains list, select a domain for the unit conversion exception.

  5. Click Unit Conversion Exceptions .

  6. In the Unit Conversion Exceptions view, click Add

     
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    .

  7. In the Unit Selection dialog box, select the unit for which you want a conversion exception.

  8. Click Select .

  9. In the Unit Conversion Exceptions view, in the SI Display Unit column, select the unit to be displayed in an SI metric system.

  10. In the US Display Unit column, select the unit to be displayed in a US customary system.

  11. Click the Save button

     
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    .

The unit conversion exception takes effect immediately unless unit conversion is disabled.

See Also

  • Units
  • Control Panel Tab
  • Unit Conversion Exceptions View
  • Select Unit Dialog Box
  • Removing a Unit Conversion Exception