| 摘要 |
PURPOSE:To obtain a diagnosing system of easy maintenance and diagnosis at low cost by switching, selecting and outputting any one of outputs from a controlling device outputting control signals by a clock signal and a storage device operating by the clock signal. CONSTITUTION:A switching control signal 15 is usually ''0'' and a controlling device 1 outputs control signals T1-Tn by a clock signal 12 to perform the whole control of a processing device. However when a check circuit 5 detects an error, a control part executes retrial, and at the failure of the retrial, the signal 15 is turned to ''1''. An address converting circuit 2 converts the signal 12 to clock frequency enabling a storage device 4 to operate to start retrial. Commands 2 are address-converted by the circuit 2 and set up on an address counter 3, which is counted up +1 by +1 by clocks regarding the converted addresses as starting addresses. The device 4 outputs signals read out by said addresses instead of the control signals. Gates 6-11 select the outputs of the device 4 and output these selected signals to devices to be controlled. |
