> For the complete documentation index, see [llms.txt](https://docs.videc.de/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.videc.de/acron-9.3/en/anlagenkonfiguration/verfahrensgroessen/rechengroesse/register_allgemein.md).

# General tab

The type of calculation variable is defined, as are the calculation basis, the compression level for the calculation result, and the calculation formula.

### Type of calculation variable

Calculation variables are process variables whose values are based on calculations. The bases of the calculations are normally the values of other process variables. When configuring the calculation variable, the data basis for the calculations (e.g. process values) is defined, as is the compression level to which the result is to be compressed. In ACRON there are three different types of calculation variables:

#### Default <a href="#rgstandard" id="rgstandard"></a>

This type essentially corresponds to the auto and manual variables. The value basis for the calculation is defined, as is/are the compression level(s) for which the result is to be delivered. The calculation results are stored on a physical medium.

Note

These calculation variables can be used in reports and diagrams. External process variables are not available here.

#### Temporary <a href="#rgtemporaer" id="rgtemporaer"></a>

The values of these calculation variables exist only temporarily, and are not stored. They serve primarily to make complex calculations simpler in format. To do so, individual calculation steps are transferred out to temporary calculation variables, which are then incorporated into the actual (standard) calculation variable.

Note

The values of the temporary calculation variables are only calculated if values are requested for the associated standard calculation variable.\
They cannot be included in reports and diagrams.

#### Live <a href="#rglive" id="rglive"></a>

This type enables calculations to be performed using values of external process variables. Multiple analysis levels can be selected for the data basis. No compression can be selected – the data basis and calculation result always belong to one compression level.

<details>

<summary></summary>

The calculation variable forms the average value for two process variables \[(PV\_1 + PV\_5)/2]\
The selected analysis levels are Interval and Day.

The calculation variable for interval data and daily data is available in the Production data area of the Reporter. For interval data, the value of the calculation factor is the average of PV\_1.ival and PV\_5.ival; for daily data it is the average of PV\_1.dval and PV\_5.dval.

</details>

As the values of external process variables are only available when the connection to the remote plant is active, these calculation variables can only deliver results then.

Note

Live calculation variables cannot be used in other calculation variables.

#### Option of using the process variables in the calculation formula of the respective calculation variable types

|                                | Auto variable | Manual variable | External process variable | Standard calculation variable | Temporary calculation variable | Live calculation variable |
| ------------------------------ | ------------- | --------------- | ------------------------- | ----------------------------- | ------------------------------ | ------------------------- |
| Standard calculation variable  | x             | x               | -                         | x                             | x                              | -                         |
| Temporary calculation variable | x             | x               | -                         | x                             | x                              | -                         |
| Live calculation variable      | x             | x               | x                         | x                             | -                              | x                         |

### Output format

Selection of the format of data output, from Numerical value or Time;

Selection of the time format (only for data output format Time):

* HH:MM
* HH:MM:SS
* DD:MM:YYYY

### Calculation result is a <a href="#berechnungsergebnis" id="berechnungsergebnis"></a>

Selection of the first compression from

* Interval value
* Daily value
* Monthly value
* Annual value

<details>

<summary></summary>

Calculation result = daily value

Calculation basis = process values

The first compression level is day data created from process values. The compression method required for this is selected on the Compression tab. As are the compression methods for any further compression levels.

Note

Additional compression levels can be activated in Plant Management/Database/[Compression levels](/acron-9.3/en/anlagenverwaltung/register-datenbank.md#verdichtungsstufen).

</details>

### Calculation basis <a href="#berechnungsbasis" id="berechnungsbasis"></a>

Values up to the level of the respective calculation result are available to select the calculation basis:

<table><thead><tr><th width="182"></th><th></th><th></th><th></th><th></th></tr></thead><tbody><tr><td></td><td>Calculation result</td><td></td><td></td><td></td></tr><tr><td>Calculation basis</td><td>Interval value</td><td>Daily value</td><td>Monthly value</td><td>Annual values</td></tr><tr><td>Process values</td><td>x</td><td>x</td><td>x</td><td>x</td></tr><tr><td>Interval values</td><td>x</td><td>x</td><td>x</td><td>x</td></tr><tr><td>Secondary interval values</td><td>x</td><td>x</td><td>x</td><td>x</td></tr><tr><td>Daily values</td><td></td><td>x</td><td>x</td><td>x</td></tr><tr><td>Monthly values</td><td></td><td></td><td>x</td><td>x</td></tr><tr><td>Annual values</td><td></td><td></td><td></td><td>x</td></tr></tbody></table>

<details>

<summary></summary>

Calculation result = daily value

Calculation basis = process values

The first compression level is day data created from process values. The compression method required for this is selected on the Compression tab. As are the compression methods for any further compression levels.

Note

Additional compression levels can be activated in Plant Management/Database/[Compression levels](/acron-9.3/en/anlagenverwaltung/register-datenbank.md#verdichtungsstufen).

</details>

### Key

Any entry capable of serving as a tool for filter conditions in the Form Designer, such as to hide or manipulate specific table rows.

## Calculation formula <a href="#berechnungsformel" id="berechnungsformel"></a>

Selection and assignment of a process variable or input of a fixed value; Input of a function or formula directly or using the [Formula Editor](/acron-9.3/en/intro.md).

Note

The desired component of the assigned process variable can only be selected by manual input or by way of the context menu for the process variable in the Formula Editor. Process variables that cannot be used are grayed-out.

The component (value) 'pval', 'ival' or dval' etc. is selected by default.

If you select a non-usable process variable, an info text is displayed in place of the components (pval, ival, etc.).

## Description <a href="#beschreibung" id="beschreibung"></a>

Detailed description of the process variable


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