| 摘要 |
PURPOSE:To simplify output equipment by outputting a digital output, and connecting the digital output to the plus and minus sides of a coil when directly driving a relay and thus increasing the number of driving relays for the number of outputs. CONSTITUTION:Digital outputs P1-P3 are connected to the plus sides of three coils in three groups in parallel, and digital outputs N1-N3 are connected to the minus sides of three coils in three groups in parallel. One-sided terminals of the digital outputs P1-P3, and N1-N3 are connected to a relay driving power supply while there is no common potential because the digital outputs are passed through phototransistors. To drive a relay 1-1, the digital outputs P1 and N1 are only turned on by a computer, and to drive a relay 3-2, the outputs P3 and N2 are turned on similarly. Therefore, when the number of driving relay for the number of digital outputs is denoted as N, it is increased to N/4 times, so the number of digital output equipment is reduced to 4/N. |
