Patent ID: 7161499

Claim:
A system for monitoring a plurality of zones (ZM 1 to ZM 4 , ZAP, ZLG), the system comprising: detection devices (DZM 1 to DZM 4 , DZAP, DZLG), each of which is disposed in one of said zones to be monitored and comprises a first (ZM 1 A to ZM 4 A, ZAPA, ZLGA) and a second (ZM 1 B to ZM 4 B, ZAPB, ZLGB) output channel, each detection device comprising at least one pair of associated detectors (dA, dB) for detection redundancy purposes, a detector (dA) of each pair being connected to the first corresponding output channel while the other detector (dB) of said pair is connected to the second output channel of said detection device; means (FDU) of processing the detection signals emitted by said detection devices; and an alarm means (FWS) actuated by said means for processing the detection signals, wherein: said means of processing the detection signals (FDU) comprise: first computers (C 1 A, C 3 A) each of which is connected to first channels of detection devices, in such a way that each first channel is connected once only to a first computer, and second computers (C 2 B, C 4 B) each of which is connected to second channels of detection devices, in such a way that each second channel is connected once only to a second computer; and electrically isolating links ( 3 ) are provided between said first (C 1 A, C 2 A) and second (C 2 B, C 4 B) computers, in such a way that a first computer and a second computer that are connected to one and the same detection device can communicate with one another.