What does the client want to access and set the value of the device, and what does it have to do with the EDS file?

[SmartPointer1]

Hello， I just started to do something about EtherNet/ip. I have a question. I want to ask if the client wants to access or set some data of the device, such as setting voltage, etc., is it related to the EDS file? My understanding is that the EDS file is an address mapping file.