Yokogawa PC-Based MX100 - Manual (Page 85)

3-4 IM MX180-01E
The following limitations exist in the joining of files through synchronization.
• If any of the divided files are missing, the files after (or before) the missing file are not
joined.
• If the total number of measured data points in the divided files exceeds 5 million, only
files that would not cause the total number of displayed data points to exceed 5 million
are joined.
When synchronizing files that exceed the 5 million point range, a specified file is used
as the start file and succeeding files are joined. If 5 million points is not exceeded
when the last file is joined, files before the start file are searched for in order, and files
that would not cause 5 million points to be exceeded are also joined. In this case,
because the files before the start file are also joined to the previous synchronized file,
two synchronized files for this file would exist. If you open a file before the start file and
perform synchronization, the viewer displays the first file the OS finds (either of the
two existing synchronized files). In such cases, it is recommended that the files you
wish to join are selected so that the limit is not exceeded, copied to the user’s working
folder, and synchronized there.
• Divided files can be joined up to the point in which the size of the joined file reaches 2
GB.
Note
• Details of Synchronization
Given M recorded data points of a given channel of a data file that has not been
synchronized, synchronization (linear interpolation) is carried out as follows:
1. From the record start/stop time and record interval, determine N, the number of data
points that will result after synchronization of the relevant channel.
2. From the record start time and record interval, determine Stn (n=0, ... , N–1), the PC time
after synchronization of each data point.
3. From the record start/stop time and the PC millisecond clock counter values at record
start/stop, determine PCcntPerms, the clock counter value per millisecond.
4. From the PC millisecond clock counter values recorded with the data before
synchronization and PCcntPerms, determine Rtm (m=0, ... , M–1), the PC time of the
data before synchronization.
5. Determine m such that the expression Rtm–1 ≤ Stn < Rtm is satisfied and retrieve the
data values before synchronization VRtm–1 and VRtm at the PC time of Rtm–1 and Rtm.
6. Determine the data values after synchronization from the expression VStn = (Stn – Rtm–1)
× (VRtm – VRtm–1)/(Rtm – Rtm–1) + VRtm–1 where (n=0, ... , N–1 and m=0, ... , M–1).
7. Determine the data values after synchronization for N data points, and then write them to
the synchronized file.
Rt m–2
VRt m–2
VRt m–1
VSt n
VRt m
VRt m+1
Rt m–1 S tn R tm Rt m+1 PC time
Data value
• When loading a data file saved by the MX100 to the CF card, synchronization is not possible
because the PC time information needed in the data synchronization is not present.
• With the /DS option, when loading a data file saved by the MX100 to the CF card,
synchronization is not possible because the PC time information needed in the data
synchronization is not present.
• Synchronization may take time depending on the number of data points in the divided files.
• It is recommended that synchronization be performed on a hard disk with adequate free
space.
3.1 Loadng Data Fles