| 摘要 |
PURPOSE:To select inputs to be used preferentially among inputs used by various equipments, by providing priority controlling circuits in series in front of the 1st and the 2nd solid-state relays. CONSTITUTION:The 1st priority controlling photocoupler 43 includes a LED44 connected in series to the input side of the photothyristor coupler 22 in a solid- state relay 11, and a photodetecting element 46 is connected in parallel between the gate and cathode of the thyristor 37 of the coupler 22 of a solid-state relay 12. Then, the coupler 22 of the relay 11 is connected to an input terminal 42 and a coupler 43 is connected to an input terminal 45. Similarly, a photocoupler 47 for priority control includes an LED48 connected in series to the input side of the couler 22 of the relay 12, and a photodetecting element 50 is connected in parallel between the gate and cathode of the thyristor 37 of the coupler 22 of the relay 11. Then, a coupler 47 and the coupler 12 of the relay 12 are connected to input terminals 49 and 42, respectively. |
