![]() ![]() But what if you want to see your pre-instructions on the left, and the graph block on the right? If you’ve spent a bit of time in Graph, you may have noticed that the whole environment shifts when you click on a Graph block. I recommend setting up a comparator in ladder and utilizing the output from a pre/post instruction. ![]() Integer comparisons can get a little messy in the Graph environment. Pre and post-instructions can be programmed in ladder, which allows some flexibility if you are trying to program something like integer comparisons. I often use these for variables that need to be continuously monitored, regardless of the step that I am in. As the name suggests, pre-instructions run before the sequencer and post-instruction run after the sequencer. ![]() Pre and post-instructions run cyclically, before and after the main sequence. For those that haven’t used Graph (and maybe those who have!), I’ve put together some tips and tricks to help you develop quickly and efficiently. For those of us who have been programming sequences in ladder logic or SCL, Graph presents an alternative method that includes some built-in functionality. SIMATIC S7 Graph is used for programming sequence logic in a graphical, flow chart representation.
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