Check the function code manual, first find a simple loop to analyze thoroughly, and then read it one by one in the order from simple to complex. In DCS software, the logic diagram of DCS (Distributed Control System) is usually viewed through the graphical interface. The following are some common DCS logic diagrams:

1. Control logic diagram: It represents the logic relations and control strategies in the control system, including controllers, sensors, actuators, etc.

2. Process flow chart: shows all stages and steps of the factory or process flow, including equipment, pipelines, valves, etc.

3. Instrument diagram: shows the position and status of various instruments, including thermometers, manometers, flowmeters, etc.

4. State diagram: shows the state and operation of each component in the system, including equipment, sensors, controllers, etc.

5. Electrical diagram: shows the layout and connection mode of the electrical system, including cables, switches and protectors.