The most interesting functionality is related to recording capability, however. As shown in the previous image, the production line is governed by a Programmable Logic Controller (PLC), which is interfaced to several actuators and sensors. Of course, the line may be subject to different kinds of faults. The most severe—for instance, a major mechanical failure—can lead to the automatic stop of the line. Thanks to the aforementioned sensors, the PLC is aware of such faulty conditions. In the occurrence of these events, it raises an alarm signal directed to the video recording system. Whenever an alarm is detected, the recording system stores on a mass storage device high-frame-rate footage showing what happened right before and right after the alarm event. This footage will be used later on for post-mortem analysis. In other words, automation engineers and maintenance personnel can leverage this fine-grained sequence of frames to analyze in detail the framed scene around the alarm event moment.

===Alarm mode===