Three-input signal section, application to a selector with N inputs and to a poller with N inputs

A signal selector (FS) comprising a first input (E1), a second input (E2) and a third input (E3) which are able to receive respectively a first signal (E.sub.s 1), a second signal (E.sub.s 2) and a third signal (E.sub.s 3) and comprising a first output (S1) and a second output (S2), which comprises:

• a first two-channel diverter (AIG1) provided with an active input (A), with a quiescent input (R), and with a control input (EC) which is able to receive a control signal which sets, depending on its state, said first diverter (AIG1) to an active state (ACT) or to a quiescent state (REP), and with a common output (SC), said quiescent input (R) and said active input (A) of said first diverter (AIG1) being respectively connected to said first input (E1) and second input (E2) of said signal selector (FS), whereas said common output (SC) of said first diverter (AIG1) is connected to said first output (S1) of the signal selector (FS), this common output (SC) transmitting the signal applied to the active input (A) when said first diverter (AIG1) is in the active state (ACT), and transmitting the signal applied to the quiescent input (R) when said first diverter (AIG1) is in the quiescent state (REP);
• a second two-channel diverter (AIG2) provided with an active input (A), with a quiescent input (R), and with a control input (EC) which is able to receive a control signal which sets, depending on its state, said diverter (AIG2) to an active state (ACT) or to a quiescent state (REP), and with a common output (SC), said active input (A) and said quiescent input (R) of said second diverter (AIG2) being respectively connected to said second input (E2) and third input (E3) of said signal selector (FS), whereas said common output (SC) of said second diverter (AIG2) is connected to said second output (S2) of the signal selector (FS), this common output (SC) transmitting the signal applied to the active input (A) when said second diverter (AIG2) is in the active state (ACT), and transmitting the signal applied to the quiescent input (R) when said second diverter (AIG2) is in the quiescent state (REP);
• a first monitor (M1) with two inputs (X, Y), connected respectively to said first input (E1) and second input (E2) of said signal selector (FS), which is able to measure the deviation between said first signal (E.sub.s 1) and second signal (E.sub.s 2) and whose output (U) is connected to the control input (EC) of said second diverter (AIG2) and is able to control the state of this second diverter (AIG2);
• and
• a second monitor (M2) with two inputs (X, Y), connected respectively to said second input (E2) and third input (E3) of said signal selector (FS), which is able to measure the deviation between said second signal (E.sub.s 2) and third signal (E.sub.s 3) and whose output (U) is connected to the control input (EC) of said first diverter (AIG1) and is able to control the state of this first diverter (AIG1).