La Telemecanique Electrique

Bernard Le Blanc

Jean Joly

Jacky Pergent

Jean Neyroud

Yves Oehlert

Gilbert Barillier

Olivier Penot

An input card (7) is put in communication with apparatuses (16) the operation of which is to be monitored in order to initiate certain operations. A terminal-box (13) is interposed between the card (7), which possesses detector circuits (17), and the members (16). The two ends of each circuit (17) are associated with a respective inner terminal (12) of the terminal-box (13), and the two ends of each member (16) are associated with a respective outer terminal (14) of the terminal-box (13). Shunts (19,21) mounted in the terminal-box and connected to supply terminals (14a,14b) put one of the ends of each circuit (17) or member (16) at a common potential. The other terminal of each member (16) is connected to the other terminal of a circuit (17) by means of a connection (18). The invention is used to avoid the need for auxiliary terminal-boxes and cards with a common potential point.

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Biot, France

Bernard Le Blanc