System for monitoring a state of a bi-state distant actuated safety device, hereafter called "DAS", , the system comprising: - a central system, hereafter called "CS", connected to a plurality of electrical modules ; - a plurality of DAS , each DAS comprising at least one electrical contact , wherein each electrical contact is characterized by two states; - said plurality of electrical modules , wherein each electrical module is connected to at least one electrical contacts ; the system according to the invention being characterized in that : - each electrical contact is connected in parallel with an associated impedance element of the electrical module and an associated switching circuit of the electrical module , wherein the associated switching circuit is characterized by two states, respectively a closed circuit state wherein electrical continuity through the associated switching circuit is maintained, and an open circuit state wherein electrical continuity through the associated switching circuit is broken; - a loop circuit connects the associated impedance elements in series to the CS , wherein the loop circuit has predefined values of impedance in function of the states of the electrical contacts ; - the CS is configured for controlling each associated switching circuit so that N associated switching circuits are in a state which is opposite to the state of M other associated switching circuits during a measurement of a value of impedance of the loop circuit, wherein M + N equals the total number of associated switching circuits , the CS being further configured for monitoring the DAS state by measuring the impedance value of the loop circuit while switching the state of the associated switching circuits and determining from said measurement the state of each electrical contact of the DAS . - a central system, hereafter called "CS", connected to a plurality of electrical modules ; - a plurality of DAS , each DAS comprising at least one electrical contact , wherein each electrical contact is characterized by two states; - said plurality of electrical modules , wherein each electrical module is connected to at least one electrical contacts ; - each electrical contact is connected in parallel with an associated impedance element of the electrical module and an associated switching circuit of the electrical module , wherein the associated switching circuit is characterized by two states, respectively a closed circuit state wherein electrical continuity through the associated switching circuit is maintained, and an open circuit state wherein electrical continuity through the associated switching circuit is broken; - a loop circuit connects the associated impedance elements in series to the CS , wherein the loop circuit has predefined values of impedance in function of the states of the electrical contacts ; - the CS is configured for controlling each associated switching circuit so that N associated switching circuits are in a state which is opposite to the state of M other associated switching circuits during a measurement of a value of impedance of the loop circuit, wherein M + N equals the total number of associated switching circuits , the CS being further configured for monitoring the DAS state by measuring the impedance value of the loop circuit while switching the state of the associated switching circuits and determining from said measurement the state of each electrical contact of the DAS . <EOS>