Mọi người làm thử cái này nhé:

1.Start S7 PLCSIM.
2.Open the Graphics Designer.
3.Insert a control object.
Now select the object "Siemens.S/WSPanel.1"

5.Open the Object Properties of this object.
6.Change the "Connect" attribute to "Yes"

Save your picture.
Note:
Always start S7-PCLSIM before calling the picture.