Internal variables
Internal user-defined variables provide the possibility to save data
temporarily in the EXTER panel, allowing, e.g. a package of data to
transferred to the PLC at once instead of sending each value alone. If the PLC
does not have a data register, the operator terminal’s internal variables can be
used instead.
Internal variables can be used and selected in the same way as different drivers. A number of volatile and non-volatile user-defined variables can be selected. When a value is changed, the non-volatile variables are saved in the flash memory to be read at the next start-up. The system variables are fixed. These can be used to display e.g. poll intervals and for toggle functions.