Yaskawa MP900 Series MPLOGGER - Manual (Page 99)

7 Log Database Configuration
7-8
7.5 Accessing Log Data Example
Suppose that the tag values from 13:00 to 15:00 contained in tag Group A on November 20,
1998 are required.
1. Open the data logging database and look at the change history.
Sort the GroupIDTable by CreateDate and check which CreateID applies to 13:00 on
November 20, 1998.
2. Look at the GroupTable in the data logging database and identify records with the Cre-
ateID found in Step 1. From these records, the one with name GroupA is the desired
record. Check the GroupID of this group.
3. Look at the TagTable in the data logging database and search for the GroupID found in
Step 1. The record with this GroupID is the desired tag in GroupA.
Check the TagID array and the tag name.
Close the data logging database.
4. Open the log database for November 20, 1998.
Search the log data for items with the TagID found in Step 3. Identify items with a Log-
icalTime between 13:00 and 15:00. This is the desired data.