<< Click to Display Table of Contents >> Manual > Server Creation Guide > Action Edition > Action Reference > Summary Actions (Logging/Counting/Daily Reports) > Explanation by Function > Logging Function > Operational specifications during abnormal conditions (such as communication errors)

Operation when a communication error occurs

In the summary action logging function, if a communication error occurs during logging and the tag quality becomes other than GOOD, a blank value will be saved in the historical data.

 

A null value means that in the case of CSV, nothing is stored between the commas.

Also, in the case of ODBC, if the database supports NULL values, a NULL value will be written.