PROFINET-INspektor® NT is an ideal online diagnostic tool for PROFINET. It can measure PROFINET network load, data throughput, cycle time, telegram missing, jitter and other network quality data in real time, and quantify and visualize the current quality status of PROFINET. Through long-term data accumulation and comparison, the possibility of pre-maintenance of PROFINET network quality is realized, and thus the downtime caused by PROFINET network quality problems is minimized.