IC600CB526

IC600CB526

IC600CB526

IC600CB526

IC600CB526

IC600CB526

入出信息变换、可靠物理实现，可以说是PLC实现控制的两个基本要点。
入出信息变换靠运行存储于PLC内存中的程序实现。PLC程序既有生产厂家的系统程序(不可更改)，又有用户自行开发的应用（用户）程序。系统程序提供运行平台，同时，还为PLC程序可靠运行及信号与信息转换进行必要的公共处理。用户程序由用户按控制要求设计。什么样的控制要求，就应有什么样的用户程序。
可靠物理实现主要靠输人（bbbbb）及输出（OUTPUT）电路。PLC的I/O电路，都是专门设计的。输入电路要对输入信号进行滤波，以去掉高频干扰。而且与内部计算机电路在电上是隔离的，靠光耦元件建立联系。输出电路内外也是电隔离的，靠光耦元件或输出继电器建立联系。输出电路还要进行功率放大，以足以带动一般的工业控制元器件，如电磁阀、接触器等等。 

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PVDM3-192 CISCO 192-CHANNEL VOICE AND VIDEO DSP MODULE
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