Data retrieval limits

Error code -11091 indicates that a single query initiated by a PI DataLink function attempted to retrieve more recorded values from Data Archive than allowed by the ArcMaxCollect tuning parameter.

Because this limit applies to recorded values retrieved from Data Archive, even functions that return small numbers of values can exceed the limit posed by this tuning parameter. For example, the value of the PI point sinusoid constantly varies between 0 and 100. You might create a function that returns sampled values of sinusoid every 30 seconds over a year with a filter to exclude values less than 95. This function might return a relatively small number of values, but will retrieve many more recorded values from the archives to process the query.

If you receive this error, consider modifying your search criteria to reduce the data retrieved. For example, you might reduce the time period over which the function retrieves data.