| 摘要 |
PROBLEM TO BE SOLVED: To provide a control device which prevents erroneous detection of a disconnection failure between a relay circuit of an analog signal and an analog input port.SOLUTION: In the state where supply power to 60-62 is maintained equal to or lower than a predetermined level by an electric load control section 11, a disconnection failure detection section 12 executes high potential side recognition processing in which an analog input port ANI0 is selected by a selector circuit 15, a capacitor 21 of a sample and hold circuit 14 is charged, an analog input port ANI1 is then selected and a digital conversion value of an analog signal inputted to the analog input port ANI1 is recognized by an A/D conversion section 13. If the digital conversion value is out of a predetermined range, it is judged that the disconnection failure occurs between a signal relay circuit 50 and the analog input port ANI1.SELECTED DRAWING: Figure 1 |
