(In fact, the common wiring systems are: building and building complex wiring system (PDS), intelligent building wiring system (IBS) and industrial wiring system (IDS), the principle of the design method is basically the same. But PDS is suitable for business and office automation environment, IBS is suitable for building environmental control and management environment, and IDS is suitable for industrial communication environment. And PDS is the general wiring in the usual sense, and this lesson plan also focuses on this.)