IC200ACC402
来源：厦门四点零自动化科技有限公司
发布时间：2020-10-13 15:44:52
可编程控制器的输入信号类型可以是开关量、模拟量和数字量。一般来说，输入单元由两部分组成：一部分是与被控制设备相连的接口电路，另一部分是输入图像寄存器。
输入单元接收来自用户设备的各种控制信号，如限制开关、操作按钮、选择开关、跳转开关和其他传感器。通过接口电路，这些信号被转换成中央处理器能够识别和处理的信号，与输入的图像寄存器共存。运行时cpu从输入图像寄存器中读取输入信息并对其进行处理，将处理结果存储在输出图像寄存器中。
为了防止各种干扰信号和高压信号进入PLC，影响其可靠性或造成设备损坏，现场输入接口电路一般采用光电耦合电路隔离。光电耦合电路的关键器件是光耦合器，通常由发光二极管和光电晶体管组成。
通常PLC输入类型可以是DC（DC24V），AC和AC和DC。输入电路的电源由外部提供。有些也可以由PLC内部提供。对于DC输入，根据场输入接口电路的形式，它分为两种类型：源输入和宿输入。绝大多数欧洲和美国的PLC使用泄漏输入，而绝大多数亚洲的PLC使用源输入。
PLC通过输入/输出终端与控制对象相连。PLC的输入输出端通常有三种组织形式，即汇点式、分组式和分离式。PLC的输入端大多采用汇点式，部分PLC采用分组式，以增加使用的灵活性。
收集温度、压力、流量，并根据收集的数据对加热流量进行控制，达到了节能的目的。根据室外气候的变化，通过调整原管网电阀的开口，及时控制二次管网的回温。通过调度给定的控制曲线，每个换热站的运行参数是在给定的范围内。同事们，中央控制室根据需要，对调度的电阀进行远程控制，调整运行参数。gprs dtu系统配置，能实现温度控制，充填遥控水泵频率转换。上位机选择配置王配置软件，与数据库结合，存储分析所有数据，并能配合优化软件进行优先级控制。
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