Patent ID: 8902063

Claim:
Safety detection system comprising: at least one first detector and one second detector, each detector comprising two input terminals connected to its safety logic inputs, two output terminals connected to its safety logic outputs and two supply terminals connected to two electrical supply lines, the two output terminals of the first detector being connected to the two input terminals of the second detector and the two output terminals of the second detector being connected directly, or indirectly via a safety module, to members for controlling the application to be secured, so as to form a detection chain; the safety logic outputs of each detector being activated depending on a surveillance state of said detector, characterised in that: the first detector comprises a diagnostic output interface, and the second detector comprises a diagnostic input interface, connected only to the diagnostic output interface of the first detector, and a diagnostic output interface, so as to form a diagnostic line; the first detector comprises means for generating diagnostic information comprising its surveillance state, and means for sending this diagnostic information on the diagnostic line to the second detector; the second detector is designed to enrich the diagnostic information received by inserting therein its surveillance state; and the system comprises a diagnostic module connected to the diagnostic output interface of the second detector and intended to receive the diagnostic information, to interpret it, and to control the start-up of the application.