| 摘要 |
PURPOSE:To obtain an output changing with the same polarity attended with on/off of a contact independently of a connecting method by detecting a dissidence between an output voltage signal level and a voltage level across the current limit resistor and generating an output in a circuit converting a contact signal into a voltage signal. CONSTITUTION:An input circuit 101 produces an output whose polarity is changed reversely in response to on/off of a contact 5 according to the connection method shown in full lines and dotted lines. A voltage level detection means 102 detects a level at the terminal 2 of the circuit 101. A dissidence detection means 103 detects the dissidence between both output signals of the circuit 101 and the detection means 102 to produce a voltage signal output. Thus, even when the connecting method of the contact of the conversion circuit is different and the change in the polarity of the output of the input circuit 101 attended with the on/off of the contact is reversed, the detection means 103 inverts or non-inverts the output signal of the circuit 101 to obtain a voltage signal output in response to the output signal corresponding to the voltage level at the other end of the current limit resistor 4 detected by the detection means 102. |
