PTCO在P8-47的例子里，逻辑开始执行时所有的变量置为0。在第二次扫描开始前，用于PTCON的变量Xsition置为1，并保持到第2,3,4次扫描。在第5次扫描之前变量Xsition置回0,并保持到5，6,7次扫描。这样循环往复。在第2梯级的PTCON指令在第2、8、14次等扫描期内传递能流。前次扫描变量Xsition的值是0,本次扫描变成1。在其他的扫描中，PTCON指令不传递能流。
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