| 摘要 |
PURPOSE:To prevent the transmission of an abnormal control output from a faulty system by providing a high speed switching circuit of on/off operation by the own digital output signal to each controller. CONSTITUTION:When a main system controller 1 is normal, a high speed switching circuit 11 is set by the digital output signal 12, a control output signal 3 is outputted to a memory 6 so as to control a control object device 7. On the other hand, if the main system controller 1 is faulty, no digital output signal 12 is transmitted and a momentary contact output becomes automatically an OFF output. Thus, the high speed switching circuit 11 is turned off and the transmission of faulty output of the control signal 3 is blocked. When the controller 2 of the standby system is detected a fault of the main system controller 1, a high speed switching circuit 13 is set and a control output signal 4 is transmitted to a devide 7 to be controlled via the memory 6. |
