Internal Memory; Function Of The Diskette Drive/Data Carrier Change Function - Endress+Hauser memo-graph Version II Betriebsanleitung

Internal memory

The saved measured values indicate signal changes and give access to previous
sequences. The large internal memory operates as a ring memory. If this is full then
the oldest data is overwritten. This means that the latest data is always available. The
measured values are not lost on power failure (internal memory buffer).
Hint:
• The memory is deleted after operating parameter changes and the memory is then
filled with new data.
• If the old data is required this should be read out either by using the serial link and
PC software or by storing it on diskette and removing this before changing any
parameters.
Funktion of the diskette drive/data carrier change function
Without influencing the internal memory, data packages are copied in blocks (block
size 8 Kbytes) to the diskette (3 1/2", 1,44 MB, PC formatted). A test is always done to
see if the data has been transmitted fault free to the diskette. The same occurs on
storing the data to PC using the software package available as an accessory.
The ATA flash memory card function is the same as a normal diskette.
Hint:
• Always use formatted labelled diskettes.
• All data on diskette is overwritten once it has been placed into the unit.
• In normal operation the amount of diskette memory used is displayed in the top right
hand corner of the screen ("Disk: xx %" or "ATA: xx.x%").
• Lines "-" in the disk display mean there is no diskette in the drive.
• Always operate the push button marked "Diskette" before removing the disk. The
actual data block is finished and then copied to the diskette. This makes sure that
all data up to the last storage is available.
• Dependent on the unit configuration (see "Setting up unit - Set up") a message is
displayed on the screen before the diskette is 100 % full. This message must be
acknowledged.
• Update and change the diskette before changing any unit parameters.
Reason: The internal unit memory and the diskette data is deleted and overwritten
with new data when parameters are changed.
• The unit remembers what data has been transferred to the diskette. If the diskette
has not been changed on time or a new diskette has not been placed in the drive
the new diskette is filled with the missing data, so long as it is still available.
Because measured value recording has highest priority it can take up to 15 min. to
copy 1MB of data to diskette (approx. 20 sec. when using the ATA flash disk).
• The drive LED is illuminated during data save to the ATA flash memory card. The
ATA flash memory card must not be removed during this procedure!
• There is no automatic data save (can be ended bymanual initialisation) for a period
of 5 minutes after inserting the ATA flash memory card. This gives the possibility to
test the ATA flash memory card "contents" ("ATAFlash —> Info"), or to save /load a
parameter file. For this time during normal operation "*ATA" is displayed in the top
right header.
6. Handling in operation
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