146 Rockwell Automation Publication 1426-UM001J-EN-P - August 2019
Chapter 6 Logging
Data Log Single Record Retrieval
A controller or application can sequentially retrieve records from the Data Log
files by following the process described in this section, following these general
tasks. The tables that are referenced are in Appendix A
.
1. Read the number of log files from the Statistics.Logging
table.
2. Wri te the Configuration.Log_Read
table and read the filename from the
LoggingResults.DataLog_FileName
table until the desired log file is
selected.
3. Write the selected file name into the Configuration.DataLogFile
table.
4. Perform sequential reads of the LoggingResults.Data_Log
table and store
the results in a suitable location.
The Statistics.Logging
file contains the following Data Log information:
• Element 7 and 8, the number of Data Log records
• Element 9, the number of Data Log files
The Configuration.Log_Read
table contains the following elements:
• Element 0. Write a value of 7 to request the next Data Log file name
• Element 1: Write a 0 to return the most recent file name first or a 1 to
return the oldest file name first
The LoggingResults.DataLog_FileName
table returns a string containing the
requested file name. The file name contains the starting date and time of the log
file, as described in File Names
on page 144
26 DataLog_Parameter_21 Values of user-selected or default parameters
27 DataLog_Parameter_22
28 DataLog_Parameter_23
29 DataLog_Parameter_24
30 DataLog_Parameter_25
31 DataLog_Parameter_26
32 DataLog_Parameter_27
33 DataLog_Parameter_28
34 DataLog_Parameter_29
35 DataLog_Parameter_30
36 DataLog_Parameter_31
37 DataLog_Parameter_32
Table 17 - Data Log Logged Parameters
Element Tag Name Description
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