| 摘要 |
PURPOSE:To read a digital signal in another element without any error and to reduce power consumption greatly by flowing a current through a photocoupler when a push-button for interruption is operated, and outputting the specific digital signal while insulating it by photocouplers. CONSTITUTION:When the push-button PB is pressed after a process set value is determined by a digital setter 1, a power source 24V flows a current to resistances R2 and R1, and the switch PB, and the ground is sequence and a transistor TRT turns on immediately. Consequently, a voltage VC appears at the collector side of the TRT and the process setting by the setter 1 is already completed, LEDs of photocouplers 2-1-2-15 corresponding to switches SW1-SW15 for process setting turn on to output the digital value as the process set value while it is insulated by the photocouplers 2-1-2-15. |
