PI tags from devices often have negative or values indicative of the process being down or the device malfunctioning. When this data is being used as inputs for analysis it must be filtered out. Which requires a "filtering" analysis and and intermediate filtering tag. It would be a helpful to have an option on the input attribute "clamp" the data. Basically check clamp and AF would do a "live" filter of the data and only allow the "good" data to pass to the analysis.
Originally posted on UserVoice