描述
此外还有其它一些内部器件，了解某PLC性能时，也都必须掌握它。内部器件也是PLC指令的操作数，不弄清楚是无法编程的。PLC有多少条指令，各条指令又具有什么功能，是了解与使用PLC的重要方面。你不懂PLC指令怎么编程
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