Abstract
Normally, when setting up industrial control systems, a two-valued (binary) logic is used. Under certain conditions, however, equipment expenditure for signal processing may be cut down by using a three-valued (ternary) logic. The paper deals with the most important ternary functions and their characteristics. Realization of these functions, equipment-wise, is illustrated by the diaphragm and pure fluid elements of the DRELOBA pneumatic control system. In conclusion, an embodiment is described giving evidence of the fact that savings in circuit elements and signal transmission lines may be achieved by using the ternary logic as compared with pure binary circuits.
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