| 摘要 |
PURPOSE:To eliminate the need for processing of a complicated system control program by switching a gate circuit depending on the presence of a fault in each device to attain continuous operation. CONSTITUTION:When a fault takes place in a central processing unit 21a, a supervisory circuit 22a activates a fault report signal 23a into logical 1 to close immediately gate circuits 27a, 28a. The fault report signal 23a of the central processing unit 21a opens gate circuits 27b, 28b of the central processing unit 21b so as to be switched. Thus, even if a fault takes place, continuous operation is attained and complicated disconnection is not required. |
