When the program and simulation software debug the control program, according to the designed ladder diagram about mixing control, S7-200 simulation software of PLC is selected for simulation.<br>The specific steps are as follows:<br>(1) Firstly, cpu226 (point configuration-tip de CPU, then point accepter) of the simulation software is used;<br>(2) Import ladder;<br>(3) Click Run;<br>(4) Conduct debugging.<br>Observe whether the lights on the simulation software turn on in order according to the program requirements, and whether the delay is accurate. It means that the program is correct, not that there are still problems in the program.<br>
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