Method of verifying an extension area sensor controller, master controller of area sensors, and cover to be used when no slave controller is added

摘要

In a method of verifying the addition of a slave controller (5) to the master controller (4) of more than one area sensor by electrical means of recognizing its extension, a cover (64) is mechanically connected to said master controller (4) when no slave controller (5) is added, thereby ensuring that not only the extension but also the non-extension of a slave controller (5) can be verified.