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Quantity variable |
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Quantity variable |
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One queried quantity can be assigned to the variable (e.g. electric power, output, consumption, etc.).
To select the desired quantity open the hub indicated by the name of the given measuring instrument, then select the desired quantity.
Setting possibilities:
| • | Name: this will be the name of the variable, as reference in the expression (should be unique in the given group). |
| • | Measurement unit: in can be given manually or can be queried from the resource database. |
| • | Multiplier: number (integral), by which the queried quantity will be automatically multiplied at the time of evaluation. |
| • | Summarizing method: here we can specify by which operation the program will determine the value of the given variable: |
- Consumption: the system calculates a consumption value from the stored data samples (last value - first value)
- First value: the system will give the first data sample of the queried interval as the value of the variable
- Last value: the system will give the last data sample of the queried interval as the value of the variable
- Summary of all the data: addition of all the samples in the given interval
- Average: the average of samples in the given interval
- Sample number: number of samples found in the interval
| • | Can have a zero value: in case the system is not able to evaluate the variable for any reason, it will give a 0, or nothing value. |
See also:
Setting the data base connection (for quantity variables)
