Creating virtual Math element
Content
Introduction
The virtual "Math" sensor allows you to calculate the value according to the data of arbitrary sensors. For example, the diesel volume of an uneven tank can be calculated using a formula, some static data, and a level sensor data.
All Vutlan monitoring systems support adding a Math element.
Adding the Math virtual element
To create a "Math" element, press add button "" inside the "Group tree" or "System tree" menu. Then choose "Math sensor". A modal window will appear:
Click on the "Math sensor". Math element form will be opened:
Fields in the form available for change:
# | Name | Description |
|---|---|---|
1 | Name | Created element name |
2 | User-defined type | Defines the icon to be displayed in the "System tree" |
3 | Units of measurement | The unit of measure in which the value is displayed in the "System tree" |
4 | Minimum value | Determines the minimum measurement range, when the value is out of range, the sensor goes into the "Not connected" state |
5 | Maximum value | Determines the maximum measurement range, when the value is out of range, the sensor goes into a "Not connected" state |
6 | Alarm and warning levels | Defines the alarm and warning thresholds, as for other sensors, see Sensor configuration |
7 | Hysteresis | Option of setting the hysteresis state, see Sensor configuration |
The configuration of data sources is available in the "Additional" tab:
Fields in the form available for change:
# | Name | Description |
|---|---|---|
1 | Expression | Function of the form f (x). To calculate the indirect value of the sensor is possible to use an arbitrary expression, which are permissible "(", ")", as well as:
For example: "0.1*x+0.5" |
2 | Polling period | Defines the update time of the sensor value |
3 | Add variable | Allowaddingdd a new variable |
4 | Variable | Specifies a unique variable name A - Z, names cannot be repeated |
5 | Corresponding sensor | Determines the sensor whose value is used in the calculations |
6 | | Delete the variable |
You can use up to 26 variables with the names A - Z as upper case. Each variable can be associated with its own sensor, including the Math sensor.
Warning
If any of the sensors used as a variable source is not available, then the Math sensor will be in a "not connected" state.
Upper case vs lower case letter
You can use up to 26 variables with the names A - Z as upper case. Each variable can be associated with its own sensor, including the Math sensor. For example:
e is a mathematical constant, approximately equal to 2.71828, that is the base of the natural logarithm and exponential function. It is sometimes called Euler's number.
E is your variable.