请问plc中状态初始指令ist是什么，怎么用ist置初始状态 本指令用于设置初始状态及特殊辅助继电器。操作元件：x、y、m、s。使用格式：ist x 20 s20 s27 x20指定操作输入的首元件（. 当然，这段话的出处还有另外一个版本： was die erfahrung aber und die geschichte lehren, ist dieses, daß völker und regierungen niemals etwas aus der geschichte gelernt und nach.
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