Hello, my graduation project is also controlled by PLC, but it is a vending machine system. I have graduated for too long, and I am not familiar with these things, but I want to say a few words for your reference. First, the background and significance of your topic. Why did you choose it? What problems you choose to solve are only how the elevator is developing at present and how it will develop in the future, so you must know what to use to realize elevator control now and to what extent; Second, the content of the current research and the problems to be solved, such as where you want to improve, how to design hardware, how to realize software, and how to have a framework; The third is the research scheme and feasibility analysis. It is best to list two schemes and choose the better one. In fact, it's all realized by PLC now, so you have to explain that you are different from others. The fourth is the implementation plan; The fifth is reference! ! !

What are the technical indicators you are talking about, that is, what are the main indicators that the elevator system follows now, or your research method is actually to use PLC control to realize the only control of the elevator! Other specific content you need to search online, this should be a lot.

My advice to you is that it is a bit bad for you to use this as your graduation project. Now the elevator is very good, and it needs to be improved! Wish you success!

Please accept the answer if it helps!