Siemens PLC program download and upload - Database & Sql Blog Articles

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The program block (data block or system block) programmed in the programmer is written into the CPU of the plc, which is called “download”; otherwise, the program in the CPU of the PLC is transferred to the programmer, which is called “upload”.
Before downloading the program, you must connect the PC/PPI cable as required, set the communication parameters, and put the PLC in the "stop" mode, click the "Download" button in the toolbar (see Figure 12-3.3), or Select the main menu "File" - "Download..." option, click the "OK" button to start downloading the program.

When the download command is executed for the first time, the "Program Block", "Data Block" and "CPU Configuration (System Block)" check boxes are selected. If you do not need to download a certain type of block, the corresponding check box should be cleared.
After the download is successful, if you want to run the program in the PLC, you should switch the PLC from "STOP" mode to "RUN" mode.
For PLCs that are already operational, you can move the required blocks (blocks, data blocks) by clicking the "Upload" button or by selecting the main menu "File" - "Upload..." option. Or system block) copied from the PLC to the programmer.