| 摘要 |
PURPOSE:To avoid the simultaneous application of the voltage as well as the erroneous reading of the information and thus to enhance both the reliability and the working performance by eliminating the closed circuit by plural control units provided in parallel. CONSTITUTION:A fixed number of input circuit 2A and 2B are provided in parallel to plural control units which are installed in parallel. And signal input lines 21A- 2mA and 21B-2mB are connected to circuit 2A and 2B, and then external input contact groups 111-11m and 121-12m divided every fixed number are connected each of the signal input lines via common line 61 and 62. And then the voltage of power circuit 5AP and 5BP are applied in sequence via output contact circuit 3A and 3B and with every input contact group, and the time division is given to line 61 and 62 to supply the signals corresponding to the opening and closing of input contact groups to circuit 2A and 2B through the control unit each. In such constitution, power connection unit 9 is provided, and the voltage is applied so that the sum voltage may be zero. At the same time, the application of voltage is prevented to the control unit. |
