L2738 MAN 电源组件 电源组件用于提供PLC运行所需的电源

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L2738 MAN 技术规格

PLC控制系统是在传统的顺序控制器的基础上引入了微电子技术、计算机技术、自动控制技术和通讯技术而形成的一代新型工业控制装置，目的是用来取代继电器、执行逻辑、记时、计数等顺序控制功能，建立柔性的远程控制系统。具有通用性强、使用方便、适应面广、可靠性高、抗干扰能力强、编程简单等特点。

PLC内部工作方式一般是采用循环扫描工作方式，在一些大、中型的PLC中增加了中断工作方式。当用户将用户程序调试完成后，通过编程器将其程序写入PLC存储器中，同时将现场的输入信号和被控制的执行元件相应的连接在输入模块的输入端和输出模块的输出端，接着将PLC工作方式选择为运行工作方式，后面的工作就由PLC根据用户程序去完成，概述图是PLC执行过程框图。PLC在工作过程中，主要完成六个模块的处理。

L2738 电源组件 电源组件用于提供PLC运行所需的电源，可将外部电源转换为供PLC内部与案件适用的电源。 2.微处理器CPU及存储器组件 微处理器CPU是PLC的核心器件，CPU因生产厂商各有不同，有采用市场销售的标准芯片，也有采用可编程序控制器专用芯片。

L2738 存储器组件有两种：ROM和RAM。 3.输入及输出组件 PLC控制器 输入和输出组件是PLC与工业生产现场交换数据的界面，与普通计算机不同，PLC的工作环境比较差，需要较强抗干扰能力，输入和输出组件即是为此设计。

L2738

PLC control system is a new generation of industrial control device based on the traditional sequential controller, which is formed by introducing microelectronic technology, computer technology, automatic control technology and communication technology. Its purpose is to replace the sequential control functions such as relay, executing logic, timing and counting, and establish a flexible remote control system. It has the characteristics of strong universality, convenient use, wide adaptability, high reliability, strong anti-interference ability and simple programming.

The internal working mode of PLC is generally circular scanning, and some large and medium-sized PLCs have added interrupt working mode. When the user debugs the user program, the program is written into the PLC memory through the programmer, and at the same time, the on-site input signal and the controlled actuator are connected to the input end of the input module and the output end of the output module. Then, the PLC works as the running mode, and the following work is completed by the PLC according to the user program. The overview diagram is the block diagram of the PLC execution process. In the working process, PLC mainly completes the processing of six modules.

L2738 power supply component power supply component is used to provide the power required by PLC operation, and can convert external power supply into power supply for PLC internal and case application. 2. Microprocessor CPU and memory component Microprocessor CPU is the core device of PLC. Due to different manufacturers, there are some standard chips sold in the market, and some special chips with programmable controllers.

There are two kinds of L2738 memory components: ROM and RAM. 3. Input and output components The input and output components of PLC controller are the interfaces for exchanging data between PLC and industrial production site. Unlike ordinary computers, the working environment of PLC is poor, which requires strong anti-interference ability. The input and output components are designed for this purpose.