| 摘要 |
PURPOSE:To enable to discriminate each of conditions of a valve, by a method wherein existense of driving voltage is discriminated through an operating switch and a detecting switch, a logical circuit is constituted along with the condition of the operation switch and each of the conditions is made to indicate. CONSTITUTION:Detecting switches L1, L2 are connected with an operating switch S through diodes D1, D2 in an orderly direction and indicating lamps DO, DC of a light emitting diode are connected with both ends of the operating switch S through resistance, an AND circuit and an inverter circuit. With this construction each of states of a valve can be discriminated, as the closed plug lamp DC is lit under a closed state of the valve V, the open plug lamp DO is turned ON and OFF under a state transfering from the closed plug state to an open plug state, the open plug lamp DO is lit under the open plug state, and the closed plug lamp DC is turned ON and OFF under a state transfering from the open plug state to the closed plug state. |
