| 摘要 |
PURPOSE: A logic expression method is provided to easily confirm the configuration and state of a LD(Ladder Diagram) logic by using a LCD(Liquid Crystal Display) of a DPR(Digital Protective Relay). CONSTITUTION: A protective relay(1) and a LD design editor(3) are connected to each other through serial communications or Ethernet communications. A logic edited with the LD design editor is outputted in a LCD of the protective relay. A whole LD screen is formed in the right side of the screen of the LCD of the protective relay. A detail LD screen is formed in the left side of the screen of the LCD of the protective relay. The detail LD screen displays a region which is selected by a user in the whole LD screen. |
