| 摘要 |
PURPOSE:To cope with a power break, by connecting the output terminal of an electronic relay to the earth through a diode at the power break time. CONSTITUTION:Electronic relays 71-724 consisting of transistors for SR signal transmission and etc. are connected not only to SR lines CH1-CH24 but also to the earth through diodes D1-D24 and a common switch SW. In the normal operation, the switch SW is opened, and diodes D1-D24 are cut off for signals transmitted from respective electronic relays. When the local power source becomes faulty or broken by some cause, the switch SW is closed, and the earth is transmitted to all lines CH1-CH24 through type switch SW and respective diodes. |
