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Hi Kurt Peters,
What is your use case for writing a NULL value to a tag via PI Manual Logger?
One approach that may work for you is to write a System Digital State value, such as 'No Data' or 'No Lab Data', to the tag during a tour run. It is also possible to add a new state to the System Digital State Set or edit an existing state to have a State Name of 'NULL'; just be sure not to edit any of the states that are reserved by PI Data Archive (193-320). Article KB01016 details how to set up PI Manual Logger to write System Digital States.