| 摘要 |
<p>PURPOSE:To detect easily the power supply states of other systems by providing a relay which interlocks the ON/OFF of power supply of a system to each input device of plural systems and detecting the ON/OFF of power supply of each system with the function of the relay. CONSTITUTION:Systems 10, 20 and 30 are connected to a signal cable, and relays 13, 23 and 33 interlocking the ON/OFF of power supply of the systems are provided to input devices 11, 21 and 31 of each system. Then relay contacts 13a- 13c are connected to contacts 23a-23c and 33a-33c of other systems respectively, and contacts 13a, 23b and 33c are earthed. Now the power supply is turned on with systems 10 and 20 with the power supply turned off with the system 30 respectively. Under such conditions, contacts 13b and 13c are set at L and H levels respectively with the system 10 and an LED14b is turned on. Thus it is known that the power supplies of systems 20 and 30 are on and off respectively. In the same way, an LED24a is turned on with the system 20. Thus it is known that the power supply is on with the system 10.</p> |
