| 摘要 |
<p>PURPOSE:To attain the data transmission control in deputy and to secure safety on the fault occurrence in a central controller by providing a terminal processing unit having a function corresponding to a data transmission control function of the central controller and each means monitoring fault occurrence. CONSTITUTION:A central controller 10, a microcomputer mount device integrated terminal processing unit 20 and terminal processing units 30a-30c are connected to a multiplex transmission line A. The controller 10 is provided with a microcomputer 4 and sends a program stored in a ROM 2 to the unit 20 and the units 30a-30c via a transmission line A as a transmission signal by a transmission control circuit 1. Moreover, switches 6a-6e are monitored, and the operation of them is analyzed to control motors 8a, 8b, and electric bulbs 7a, 7b. The unit 20 is provided with the circuit 1 to monitor the transmission line A to apply the normal processing commanded by the unit 10 and when a fault of the unit 10 is detected, the circuit 1 is selected to the central processing unit mode. Thus, the unit 20 acts like a backup for the unit 10 to apply the control unchanged from the normal state thereby securing safety.</p> |
