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我们可以听到模拟测量电信号的几种标准。但是它们在哪些方面不同呢?在工业自动化中，模拟测量常见的电信号是4…20mA电流信号。这是因为该信号易于使用，并且比电压测量值0 … 10V具有更高的抗干扰能力。在4 … 20mA信号中，更容易检测传感器和控制器之间的电缆断裂。如果电流降至约3.8 mA以下，则检测到电缆断裂。在4 … 20mA和0 … 20mA两种测量中，如果电流值超过约20.5 mA，则检测到传感器输出短路。这种缺陷的检测必须在PLC程序中加以考虑。
在大多数测量传感器上，你可以读出它们的测量范围和电输出。下图显示了一个压力传感器的示例，量程为0 … 0.4巴，电流输出为4 … 20mA。图表显示了这两个范围之间的关系。
为了获得测量的实际数值，有必要根据上述公式进行计算。在一些控制器中，有缩放模拟测量的现成功能，在一些控制器中，有必要自己构建这样的功能。S7-1200控制器没有就绪功能，但我们可以使用计算或SCALE_X + NORM_X选项，Unitronics控制器已为线性功能做好准备，而在ALLEN BRADLEY控制器中，它将成为SCP功能。
在自动化接线图中，一个设备可以显示在几页上。这篇博客上的个这样的例子在文章“如何阅读电气图-继电器”中有所描述，其中一个继电器的线圈和触点绘制在不同的页面上。在这种情况下，线圈是主部件(主元件–主部件)，触点是从部件(侧元件–从部件)。原理图中给定器件的主元件应该只有一个，而副元件可以有很多。设备的每个部分(主设备和副设备)只能出现在图上的一个位置。让我们看看带转换触点的4磁场继电器的例子。
在图1中，我用橙色标记了一个设备，它是一个4极继电器。这种继电器由一个线圈(主元件)和4个触点(侧元件)组成。在一些图中，在主元素的旁边或下面，我们可以找到一个指向侧元素的链接列表。在图1的示例中，第7页的线圈下方显示了每个继电器触点字段的参考列表。请注意，在其他页面上，每个子部件旁边(引脚旁边)都有相同的参考/7.2–这意味着设备的主要组件在第7页第2列中。
自动化接线图中的PLC由相同的原理表示。根据控制器及其资源的配置，建立了侧元素到主元素的对应隶属关系。在本文的前一部分中，我给出了一个接线图中PLC组件的组成示例。大多数情况下，PLC的主要元件是CPU单元或整个PLC(包括输入和输出模块)的电源。其他元素是侧面元素。
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