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How to establish Ethernet connection between Siemens plc and Siemens touch screen
1, first open the WINCC project label management->; Right-click MPI-click system parameters in the pop-up menu.

2. Pop up the System Parameters -MPI dialog box-Select the unit tab-View the logical device name. By default, the installed logical device is named MPI.

3. Double-click the icon for setting PG/PC interface-select MPI(WINCC) from the drop-down list of access points of the application.

4. click CP56 1 1(MPI) in the used interface parameter assignment list, and then display MPI (WINCC) >: cp561/(MPI) in the drop-down list of applied access points.

5. Finally, set the communication parameters of CP56 1 1, and click Properties ... to pop up the Properties -CP 56 1 1 (MPI) dialog box.