Data Logging at Runtime SECTION 11 Data Logging
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11-3-1-5 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:
CV500[1999030712].dlv
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 29th December
1999 with a period of 1 Day, the following files will be created:
Batch1[1999122923].dlv
If the system is left running the Data Logging directory will contain the
following files:
Batch1[1999122923].dlv
Batch1[1999123000].dlv
Batch1[1999123100].dlv
Batch1[2000010100].dlv
….
….
The first file will only contain 1 hour of data, all subsequent files contain
the full 24 hours of data.
3. Data Set period = Months
If a Data Set named Shifts starts logging at 22:00 on 29th February 2000
with a period of 2 Months, the following file will created:
Shifts1[2000032922].dlv
If the system is left running the Data Logging directory will contain the
following files:
Shifts[2000050100].dlv
Shifts[2000070100].dlv
….
….
The first file will only contain 1 month and 2 hours of data, all subsequent files
contain the full 2 Months of data.
11-3-2 Data Records
There are two types of records that are stored in a Data Log file for each Item
logged these are Events (or breaks) and the Actual Data.
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