plc的基本组成可分为两大部分:硬件系统和软件系统。硬件系统是指组成PLC的所有物理电子电路，其中主要有:中央处理器(CPU)、存储器、输入输出(nputiOutput)接口、通信接口、编程器和电源等部分，此外还有扩展设备和EPROM的读写板和打印机等选配的设备。为了维护、修理的方便，许多PLC采用模块构造。由中央处理器、存储器组成主控模块，输入单元组成输入模块，输出单元组成输出模块，三者通过专用总线构成主机，并由电源模块集中对其提供电能。编程器可采用袖珍式编程器，也可采用安装有专门plc编程软件的通用计算机。
SB822
通过编程口对PLC开展编程。软件系统是指管理、控制、使用PLC，确保PLC正常工作的一整套程序。这些程序有的来自PLC生产厂家，也有的来自用户。一般称前者为系统程序，后者为用户程序。系统程序是指控制和完成PLC各种功能的程序，侧重于管理PLC的各种资源、控制和协调各硬件的正常动作及关系，以便充分发挥整个可编程控制器的使用效率，方便广阔用户的直接使用。用户程序是指使用者根据生产工艺要求编写的控制程序，它侧重于应用，以及输入、输出之间的逻辑控制关系。
SB822
The basic composition of PLC can be divided into two parts: hardware system and software system. The hardware system refers to all the physical electronic circuits that make up the PLC, including the central processing unit (CPU), memory, input-output interface, communication interface, programmer, and power supply. In addition, there are optional devices such as expansion devices and EPROM read-write boards and printers. For the convenience of maintenance and repair, many PLCs adopt modular construction. The main control module is composed of the central processing unit and memory, the input unit forms the input module, and the output unit forms the output module. The three components form the host through a dedicated bus, and the power module centrally provides electricity to it. The programmer can be a pocket programmer or a general-purpose computer with specialized PLC programming software installed.
SB822
Program the PLC through the programming port. A software system refers to a complete set of programs that manage, control, and use PLCs to ensure their normal operation. Some of these programs come from PLC manufacturers, while others come from users. The former is generally referred to as a system program, while the latter is a user program. System program refers to the program that controls and completes various functions of the PLC, focusing on managing various resources of the PLC, controlling and coordinating the normal actions and relationships of various hardware, in order to fully utilize the efficiency of the entire programmable controller and facilitate direct use by a wide range of users. User program refers to the control program written by users according to production process requirements, which focuses on the application and the logical control relationship between input and output.
SB822
There are no reviews yet.