What does category 2 and category 4 mean?
The safety category foresees the devices ability to detect a defect that can provoke a safety function loss during functioning. The category 2 foresees that the autodiagnostic function can be effected in 3 typical moments: at the first machinery start-up, at each device intervention and lastly when the user requests it externally by means of the TEST inputs. The category 4 foresees instead that the autodiagnostic function is continuously and automatically effected within the device’s response time.
