I need to take an process analog input into a PLC and "learn" the waveform for a known good manufactured part. The signal amplitude will vary during the machine cycle. When the machine goes into production mode, I need to compare that real-time signal against the learned curve and alarm if it is plus/minus 5%. Anyone have a suggestion how to accomplish this? This is a job shop so new parts will frequently need to be "leaned."

If I use SCADA historian software, I don't think the response is fast enough, so I'm thinking I must do it in the PLC. Any suggestions?