The first step: Install the programming software corresponding to the PLC on the computer (generally buy the PLC with a CD, no download on the Internet)
The second step: to have the PLC corresponding data line, used to connect the computer and PLC. (Some models of data cable can not be homemade, some can be done by themselves, such as LG PLC data cable is 2-3 3-5 5-5 line sequence, data cable can also be bought in the PLC, to the business. If you didn't ask for cable when you bought your PLC, you'll have to pay for it now.)
Step 3: Turn on the computer and run the programming software PLC Connect to the power supply Connect the computer and PLC with a data cable to execute the upload command (the prerequisite is that the program in the PLC is not password protected)