As a leading manufacturer in the field of man-machine communication, RAFI has a few categories of command and signalling devices in its portfolio. In terms of voltage, most key switches use 230 V. The key-operated switches of the different series usually offer up to four switching positions. Due to the shape of the keys, up to 10,000 different closures are thus possible. In addition, there is the additional function "authorization key": Depending on the key used, different switch positions can be keyed, i.e. only certain persons can reach the lock positions 1, 2, 3 or 4 of the control unit.
In a fictitious production plant, this could look as follows: The plant operator starts the plant at the beginning of his shift by turning his authorization key to the maximum possible position 1. In the course of the shift, an unforeseen malfunction occurs. The plant operator calls the foreman for help. He uses his key of the next higher authorization level to call up a specific program within the plant control system in which he can diagnose the fault. There, he recognizes from the information displayed that a part is jammed. To remove the part, the shift supervisor must put the plant into maintenance mode with authorization key level 3. Once the part is then removed, work can continue for the plant operator. A possible level 4 here could be a master key that resets the entire plant and its controls to default settings if it is to be disposed of or rebuilt. These exemplary possibilities show well how variable the switches can be used in everyday work.
Another advantage of the key switch is its simple integration into HMI systems such as plant control systems, elevator control panels or alarm systems. Thanks to its practical dimensions, the product can be easily placed behind the front panel or flush-mounted. Added to this is the increasingly important design aspect. Key-operated switches that you purchase from a manufacturer that carries other control and signaling devices such as pushbuttons, switches or signal lamps ensure a harmonious appearance in combination with the other articles in the series. This is particularly important if the Human Machine Interface is not only to function perfectly and safely, but also to convey a uniform brand message. Of course, the easiest way to achieve this is to find a partner who accompanies you throughout the entire process and also has all the technologies in its portfolio: Touchscreens, housings, software, computers, joysticks, electromechanical systems, pushbuttons, illuminated pushbuttons, key switches and signal lights.
In summary, the advantages of key switches are as follows: Security through key-lock mechanism, additional security through long-term available key forms and spare keys, multitude of individually determinable functions, authorizations tailored to users, surface or flush mounting options, simple integration into complex operating systems and the matching appearance to further command and signaling devices. Translated with www.DeepL.com/Translator (free version)