楼主的plc是否已进行过多次修改的操作,如是则内存资源被占用量大。 一.压缩一下内存,试一试。 1.Select the S7 program in the "Accessible Nodes" window or the online view of the project. 2.Select the menu command PLC > Diagnostics/Setting > Module Information. 3.In the dialog box which then appears, select the "Memory" tab. In this tabbed page there is a button for compressing the memory if the CPU supports this function.