Logic DiagramsDOE-HDBK-1016/2-93ENGINEERING LOGIC DIAGRAMSRev. 0Page 5PR-05Figure 3 Basic Logic SymbolsFigure 4 Conventions for Depicting Multiple InputsThe AND gate has a common variation called a COINCIDENCE gate. Logic gates are notlimited to two inputs. Theoretically, there is no limit to the number of inputs a gate can have.But, as the number of inputs increases, the symbol must be altered to accommodate theincreased inputs. There are two basic ways to show multiple inputs. Figure 4 demonstratesboth methods, using an OR gate as an example. The symbols used in Figure 4 are usedextensively in computer logic diagrams. Process control logic diagrams usually use thesymbology shown in Figure 2.
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