Emerson 5X00109G02 Controller Emerson, after understanding the program structure and programming methods, it is time to actually write the PLC program. The design of a PLC control system requires going through the following processes.
(1) Analyze the controlled object and propose control requirements
Conduct a detailed analysis of the process and working characteristics of the controlled object, understand the coordination between mechanical, electrical, and hydraulic aspects, propose the control requirements of the controlled object for the PLC control system, determine the control plan, and draft the design task document.
(2) Determine input/output devices
Based on the system's control requirements, determine all necessary input devices (such as buttons, limit switches, selector switches, and various sensors) and output devices (such as contactors, solenoid valves, signal indicator lights, and other actuators), thereby identifying the input/output devices related to the PLC to determine the I/O points of the PLC.
(3) Select the PLC
PLC selection includes choosing the model, capacity, I/O modules, power supply, etc. For details, refer to Section 2 of this chapter.
(4) Allocate I/O points and design the PLC peripheral hardware circuit
1. Allocate I/O points
Emerson 5X00109G02 Controller Emerson Draw a connection diagram or correspondence table between the PLC's I/O points and the input/output devices. This part can also be done in step 2. This results in differences in wave path and wave crest between the two wave heads. Thus, different speeds of the three-phase asynchronous motor correspond to different wave heads, wave paths, and wave crests. Therefore, different speed combinations of two three-phase asynchronous motors can simulate different sea conditions in real time. The current generation system is also controlled by a combination of AnSH PLC and FX2N PLC, each managing their respective power water pumps to create different water flow energies. The wind generation system is controlled by AnSH PLC to operate high-power fans. It is essential to use PLC control in situations where the control system logic is complex (requiring a large number of intermediate relays, time relays, counters, etc.), process flows and product modifications are frequent, data processing and information management are needed (including data operations, analog control, PID regulation, etc.), the system requires high reliability and stability, or when planning to implement factory automation networking.