Yokogawa PC-Based MX100 - Manual (Page 92)

4-4 IM MX100-01E
Save mode: The following two modes are available for the save operation
when communication is disconnected.
Rotary:
In this mode, the most recently measured data is retained. Saving
is carried out while securing free space. When new files are
created, data files are saved while up to 30 files are deleted in
order starting from the file with the oldest time stamp in the root
directory (subdirectories are not applicable). Deleted data are not
necessarily MX100 files. If free space cannot be secured, or when
securing of free space takes extended time, an error is indicated
on the 7-segment LED (see “Media-Related Errors” in section 3.1).
FullStop:
In this mode, the oldest measured data is retained. Stops saving
when there is no more free space on the CF card.
Status detection: There are two types of statuses.
CF card inserted: Yes/No, CF card usable: Yes/No
• When the CF card is not inserted:
Inserted: No, Use: No
• When the CF card is inserted:
Inserted: Yes, Use: Yes
• When an error occurrs*:
Inserted: Yes, Use: No
• After pressing the access stop switch **:
Inserted: Yes, Use: No
* If a media-related error occurs and the card can no longer be used,
further data storage is stopped. To clear this condition, press the
access stop switch (see section 2.8) and eject the CF card. Check
the contents of the CF card and log file on the PC, and insert the
CF card again.
** If you press the access stop switch and the card can no longer be
used, further data storage (excluding the creation of a log file) is
stopped. The status is automatically cleared the next time recording
is started.
Timeout time: Initial value 60 s (settings can be changed using the MX100/
DARWIN API (sold separately))
To save the data so that no dropouts occur, the timeout time*
must be set appropriately. If the setting is inappropriate, an error
is indicated on the 7-segment LED (see “Media-Related Errors” in
section 3.1), and the data storage is not performed.
* Timeout time setting (guideline)
Timeout time [s] < 2 [MB]/(data size per second) – 20 [s]
Data size per second is the total for all measurement intervals.
Data size per second for each measurement interval = Time 16
[bytes] + (measured value 4 [bytes] × the number of channels)/
measurement interval [s]
(Ex.)
Measurement interval: 10 ms (1 type), no. of channels: 60
Data size = (16 bytes + (4 bytes × 60))/0.01 [s]) = 25600 [bytes]
Thus, the timeout time is
(2 [MB] / 25600 [bytes]) – 20 [s] = 61.9 [s] > 60 [s]
Saved channels: Measurement channels monitored on the PC
(not channels set for recording)
Save interval: 60 s (automatically saves using the timeout time as the save interval)
File size: Approx. 5 MB/file (for a file with minimum measurement interval)
Data size per channel: 4 bytes
4.2 Main Module (MX100-E) Specifications