> 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/prozessanbindung/provider/providerid/variablengruppe/register_mew-archivierung.md).
# Measured value archiving tab
Configuration of data types for measured values and of variables for service recording
### Measured value archiving
When enabled, the external measurement variables are polled by the ACRON Provider from the corresponding control system/PLC driver cyclically in order to obtain the measurement data.
Note
It should only be enabled if the external variable is to be assigned to a process variable, as otherwise the Provider will record the data unnecessarily.
Note
If the external variable is used for one or more process variables, it is not possible to disable measured value archiving.
### Data type
Data type to be used for measured value archiving.
#### Integer 32 bit unsigned (0 ... 4294967295)
* Integer numbers in the value range from 0 to 4294967295 are accepted
* Decimal places are discarded
* Negative numbers are not possible
* The memory requirement per value is 8 bytes
#### Integer 32 bit signed (-2147483648 ... 2147483647)
* Integer numbers in the value range from -2147483648 to 2147483647 are accepted
* Decimal places are discarded
* The memory requirement per value is 8 bytes
#### Integer 16 bit unsigned (0 ... 65565)
* Integer numbers in the value range from 0 to 65565 are accepted
* Negative numbers are not possible
* Decimal places are discarded
* The memory requirement per value is 6 bytes
#### Integer 16 bit signed (-32768 ... 32767)
* Integer numbers in the value range from -32768 to 32767 are accepted
* Decimal places are discarded
* The memory requirement per value is 6 bytes
#### Integer 1 bit
* The stored value can only be 0 or 1
* All number not equal to 0 are recorded with the value 1
* The memory requirement per value is 5 bytes
#### Floating point 32 bits 7 significant digits (-1.0e+35 ... 1.0e+35)
* All numbers in the value range from -1.0e+35 to 1.0e+35, with any number of decimal places, are accepted
* Only the first 7 digits of the number are mapped exactly; the following digits have random values
* The memory requirement per value is 8 bytes
#### Floating point 64 bits 14 significant digits (-1.0e+35 ... 1.0e+35)
* All numbers in the value range from -1.0e+35 to 1.0e+35, with any number of decimal places, are accepted
* Only the first 14 digits of the number are mapped exactly; the following digits have random values
* The memory requirement per value is 12 bytes
#### Text ASCII
* This data type can include text in ASCII format
* One byte is used per letter
* For most languages the ASCII data set is adequate. Only languages with a very large number of characters, such as Chinese, cannot be represented by the ASCII character set
* The memory requirement per value is 5 bytes + the number of characters in the text
#### Text Unicode
* This data type can include text in Unicode format
* Two bytes per character are used
* The Unicode character set can represent all languages
* The memory requirement per value is 6 bytes + 2 bytes per character in the text
### Data recording range from/to
Value as from/up to which changes to it necessitate a check of the variable.
Note
The entries in this range depend on the selected data type.
### Recording type
Selection of the value to be recorded at the end of the interval
* Instantaneous value
Only the momentary measured value at the end of the recording interval is recorded. This setting is advisable for count values.
Note
When applying the instantaneous value, [Delta Event recording](/acron-9.3/en/acron_der_anlagenchronist/datenaufzeichnungsverfahren.md#deltaeventaufzeichnung) can also be used.
* Average value
At the end of the respective recording interval an average value of all values measured in this interval is calculated and transmitted to ACRON.
Note
When applying the average value, the [lowest](#minimum) and/or the [highest value](#maximum) can additionally be recorded.
### Minimum
The lowest value is recorded in addition to the [average value](#mittelwert).
### Maximum
The highest value is recorded in addition to the [average value](#mittelwert).
### Period of validity
For historical data, only cyclic recordings in the form of an individual period of validity in seconds are possible. The validity period may be 0 seconds.
### Interval for cyclic recording in seconds
Recording interval in seconds
Note
For online values the recording interval must not be 0 if Delta Event 1 recording is active. In this case no cyclic control values are recorded. So values are only recorded when the value has changed according to the Delta Event setting.
### Delta Event recording 1-3
Values are only recorded when the absolute value change is greater than or equal to the defined value.
#### Value range from/to
Value as from/up to which changes to the variable's value are to be checked.
Note
The value range specified here must not be included in the next highest Delta Event recording, otherwise it will not be applied.
#### Recording in case of absolute value change >=
If a change in two consecutive values is greater than or equal to the value specified here, recording takes place.
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