Yokogawa DAQWORX - Manual (Page 117)

3-4 IM WX103-01E
• Synchronization may take time depending on the number of divided files and the number of
data points in the divided files.
• It is recommended that synchronization be performed on a hard disk with adequate free
space.
• Even when synchronization is performed, the files before synchronization (.mxd extension)
are not deleted.
• Performing synchronization on the Viewer or loading a file with a great number of data
points while data monitoring/computation is in progress on the Logger of the MXLOGGER
or the Integration Monitor of the MX100 Standard Software may adversely affect the data
monitoring and computation (such as data dropouts).
• If you change the PC’s time while data is being monitored on the Logger of the MXLOGGER
or the Integration Monitor of the MX100 Standard Software, the error in the clock counter
value per millisecond of the PC used in the synchronization process will become large. If the
error in this value is greater than or equal to 2% when synchronizing the data file created at
the time PC’s time was changed, the clock counter value of 1 millisecond is considered to
be 1 for the purpose of synchronization.
• If communication is disrupted temporarily due to power failure or network failure during the
recording operation, the PC time of the data measured by the MX100 while communication
is disrupted (see “Details of Synchronization” above) is recorded as the old PC time before
communication was disrupted in the file created immediately after communication recovers.
If you attempt to synchronize this file, a dialog box with the message “Some channels do
not have enough information to synchronize.” appears. In this case, synchronization is
performed with the premise that the MX100 measured the data using the logical (estimated)
record interval.
Data Fles Created by Synchronzaton
The data file created by synchronization takes on the same file name with .mxs
extension.
When synchronizing, if the backup file is placed in the same folder, data dropout from
the recording file is embedded in the backup file (data saved to the CF card), and
synchronization of channel data is performed. Also, the between channel delay in the
medium speed modules is compensated during synchronization.
Synchronized files created by the synchronization process are created in the same
directory as the data file normally displayed. The file name is “the name of the file being
displayed (excluding the .mxd extension)” + “mxs extension” However, if the destination
storage medium is write-protected, the file is created in the temporary file directory. The
temporary file directory is displayed in an error message dialog box.
Jonng of Dvded Fles
When divided data files are loaded, they are joined by the synchronization process.
If a file that can be joined to the displayed data exists and you synchronize the data,
the existing synchronized file is overwritten. If the existing synchronized file cannot be
overwritten (set to read-only attribute, for example), a new synchronized file is created.
A sequence number is added to the name of the new synchronized file (“the name of the
file being displayed” + “sequence number” + “mxs extension” For example, if the existing
synchronized file name is “data-0000.mxs” the new file name is “data-0000- 1.mxs”
The following limitations exist in the joining of files through synchronization.
• If any of the divided data files are missing, the data files after (or before) the missing
file are not joined.
• If the total number of measured data points in the divided data files exceeds 5 million
(including data that is dropped due to power failures and other failures), files that
would not cause the total number of displayed data points to exceed 5 million are
joined.
3.1 Loadng Data Fles