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CHAPTER 11 – Data Logging
If a session is halted and Data Set Items changed, deleted or new ones added it is not valid to
continue using the existing file. When the session is restarted and Data Set file opened CX-
Supervisor checks to see if there are any differences between the current Data Set and the Data Set
stored in the file. If any differences are detected the System will mark the existing file as invalid by
altering the Timestamp brackets from "[ ]" to "{{ }}" and create a new file.
For example, if a file Batch1[2000032922].dlv is detected as being invalid it will be
renamed Batch1{{2000032922}}.dlv. A new Batch1[2000032922].dlv file will
then be created to log the new data.
If the file Batch1{{2000032922}}.dlv already exists then the current invalid file will be
renamed Batch1{{2000032922}}_1.dlv and so on.
This is most likely to occur during the development of an application when Data items are
continually being amended and tested.
Invalid files are not part of the Data Set files and can not be purged or found by the File Management
'next' or 'previous' searches. The data recorded in these files is not lost and can be viewed using the
Data Log Viewer and exported from them using Export Log. Invalid files can only be deleted using
Windows explorer.
Data Set Period Examples
The following examples show how the specified period (Hour(s), Day(s), Month(s)) is implemented
while the System is running:
1) Data Set period = Hours
If a Data Set named CV500 starts logging at 12:30 on the 7th March 1999 with a period of 6 hours,
the following files will be created:
If the s7stem is left running the Data Logging directory will contain the following files:
CV500[1999030712].dlv
CV500[1999030718].dlv
CV500[1999030800].dlv
CV500[1999030806].dlv
....
....
The first file will only contain 5.5 hours of Data because the minimum resolution is one hour and the
file was created on the half-hour, all subsequent files will contain the full six hours of data.
2) Data Set period = Days
If a Data Set named Batch1 starts logging at 23:00 on the 29
the following files will be created:
Page 182
CV500[1999030712].dlv
th
December 1999 with a period of 1 Day,
OMRON
Release 2.0
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