| 摘要 |
PURPOSE:To utilize the limited input ports of a control part effectively at low cost, by connecting a power source to the plural input ports through switches in the input equipment of a control circuit using a key matrix circuit. CONSTITUTION:A power source Vcc is connected to input ports 11-14 through switches S1, S6, S11, and S16. By changing the control information of a control part 1, the number of switches for inputting the control information is increased or decreased at need without adding more input and output ports. |
