1. Open STEP7Micro/WIN software and connect S7-200PLC.
2. Select "Online Mode" in the "Operation" menu, connect to PLC and download the current PLC program.
3. Open the "Monitoring Window", which will display the status of the program currently running on the PLC.
4. You can use the Step button to execute the program line by line, or press the Continue button to execute the whole program at one time.
5. If errors are found in the program, you can modify the program in the program editor, upload it again and execute it.