The source can be any tag or calculation whose value will change between 0 and a non-zero value.  The count will be increased each time the source changes from 0 to a non-zero. 

Constants are not useful here, but are a standard part of this type of selector.

The counter tag will log its value at the end of each interval specified.  This interval goes by the clock, not by running time.   If, for example, the log interval is set to "Day", the tag's value will be logged at midnight, not at the end of 24 hours of operation.  If the log interval is set to "Hour", the tag's value will be logged each hour on the hour. "Weekly" means midnight Sunday night and "Monthly" means at midnight before the first day of the month.

You can select whether or not the counter should be reset to 0 after its value is logged. 

Text that states what the counter tag is counting (e.g. Starts).

Allows you to specify a tag or calculation to force a reset of the counter.  Note that the current value of the tag will always be logged before a reset.  The reset will occur when this source changes from a 0 or false value to a non-zero or true value.  A change from invalid to true does not cause a reset.