PROBLEM TO BE SOLVED: To provide a new detecting circuit by plural relays.;SOLUTION: In order to make a (detecting circuit by 'n' relays operation out of 'x' relays), the portion, where the load of the detecting circuit by one relay operation out of two relays is excluded, is considered a block and one of the contact points within the blocks to be combined is shared, and the blocks are composed, so that the lines linking the central points of the blocks sharing the contact point form a quadrilateral and has point-symmetry. The contact points standing side by side are interlocked without fail, and the number of motions in that circuit becomes 'x' and the circuit is opened and insulated by contact points 'a', thereby the number of circuit cut off minus 1 becomes 'n'. When 'x' is an arbitrory number and 'n' is same number as 'x' or zero, it forms a (detection circuit by 'n' relays operation among 'x' relays), and it becomes a circuit connecting in series only the contact points 'a' or only contact points 'b'. Therefore this relay circuit theory becomes a 'detecting circuit by (only) 'n' relays operation out of 'x' relays', where ∞≥x, ∞≥n, x≥n.;COPYRIGHT: (C)2002,JPO
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