| 摘要 |
PURPOSE:To attain the cost reduction of the titled apparatus, by performing self- diagnosis by forcibly turning the control output to control machinery ON and OFF. CONSTITUTION:The output signal of an output circuit B, of which the output level changes between at the time when the control output issued to control machineries A1-A4 at the time of self-diagnosis is constant and at the time when said control output changes by 1, is inputted to the single self-diagnostic input port of a control apparatus C. The control output to the control machineries A1-A4 is temporarily prohibited by a self-diagnostic output oscillation means D to emit a self-diagnostic control signal having an ON-state and an OFF-state to one control machinery selected according to a predetermined order and, from the level change of the signal inputted through the output circuit B, a diagnostic means E diagnoses whether the control output is normal. Therefore, because a signal can be inputted to the apparatus C by using a single signal circuit, miniaturization is attained. The control output is forcibly turned ON and OFF in spite of the control characteristics of the control machineries A1-A4, the diagnosis of the output signal of the control machinery can be performed by same diagnostic sequence and cost reduction can be attained. |
