用户程序包括有启动所用逻辑,每一逻辑块(主程序或子程序)所允许的最大回路数值为3000,逻辑则由PLC重复执行。参见PLC安装手册(系列90-30CPU:GFK-0356;或系列90-20 CPU:GFK-0551)的相应部分,其中列出每种型号CPU的程序规模和参考地址限量。所有程序都先从-一个变量说明表开始,此表列出用户程序参考的别名和参考地址的说明,程序块说明编辑器列有主程序中所说明的子程序块。
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