> 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/variablen-f-hg/register_mew-archivierung_variablen-f-hg.md). # Measured value archiving tab Configuration of the data type for the measured values and the recording parameters ### Measured value archiving Activation of measured value archiving 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. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.videc.de/acron-9.3/en/anlagenkonfiguration/prozessanbindung/variablen-f-hg/register_mew-archivierung_variablen-f-hg.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.