Chapter 17 Auxiliary Editing Tools The comparison of variable symbols will include the step skipping in the program. As the image shown below the var_c only appears on the left and that does not exist on the right. The comparison of POUs in the languages of LD, FBD, IL, ST will include the step skipping in the program. As the image shown below, the second line on the left does not exist on the right. Once there is a difference in the SFC, the comparison of POUs in the language of SFC will be seen as different. When the Action and Transition are different in the SFC, the system will identify which sections or lines of action/transition are different.
Projects should be saved before running the program comparison tool. Be sure to select the program items while downloading the CPU module; so that the programs in the CPU module can be compared. 17.4.2 Compare with File It is used to compare different projects in the computer. Select File > Program Comparison > Compare with File, and then the Open Project window will appear. Select the project you’d like to compare with and click Open. 17-65