Commissioning
61
6.6 Saving measured values
Fig. 55: Schematic display of measured value saving
6.6.1 Internal memory
Measured value saving shows signal changes and provides access to processes which took place long
ago. They are stored (nonvolatile) in a Flash memory which is secure on power failure. This large
internal memory works as a ring memory. If it is full, the oldest data is overwritten (FIFO - first in/
first out principle). As a result, the current data is always available.
6.6.2 Scrolling through measured values
In running operation, you can scroll through the saved measured values in curve display. Use the
arrow keys ( V W ) to move backwards or forwards. Press the ESC key
Z
to return to the current
value display.
6.6.3 How the CompactFlash card works
Without affecting the internal memory, data packages are copied block-by-block to the
CompactFlash card. Tests are also made to determine whether the data has been written onto the
CompactFlash without any errors. The same happens when storing the data on the PC with the PC
software contained in the scope of delivery. The data, monitored against manipulation, is available
here. If you wish, you can export this data into other programs, such as MS Excel
®
, without losing
the protected data basis.
!
Note!
• Only use new, formatted CompactFlash cards recommended by the manufacturer (see
"Accessories", Section 8). Any data on the CompactFlash card is overwritten once the card is
inserted into the slot.
• The CompactFlash memory being written to is shown in normal operation at the top right of the
display ("CF: xx %")
• Dashes "-" on this display mean that no CompactFlash is inserted.
• Before removing the CompactFlash card, select "CompactFlash card functions/Update CF". The
current data block is closed and saved to CompactFlash. This ensures that all current data (until
the last save) is included on it.
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