若干个模块，如CPU模块、输入模块、输出模块、电源模块等等。其中各模块功能比较单一，模块的种类却日趋丰富。比如，一些可编程序控制器，除了－些基本的I/O模块外，还有一些特殊功能模块，像温度检测模块、位置检测模块、PID控制模块、通讯模块等等。组合式结构的PLC特点是CPU、输入、输出均为的模块。模块尺寸统一、安装整齐、I/O点选型、安装调试、扩展、方便。
SIMATIC S7-400 PLC S7-400 PLC is a programmable controller for medium and performance range. S7-400 PLC adopts a modular fan free design, which is reliable and durable. At the same time, it can choose a variety of levels of CPU (function is gradually upgraded), and is equipped with templates with a variety of general functions, which enables users to combine them into different ones according to their needs. When the control scale is expanded or upgraded, as long as some templates are properly used, it can be upgraded and fully needed. PLC combination
Several modules, such as CPU module, input module, output module, power module, etc. Among them, the functions of each module are relatively single, but the types of modules are becoming more and more abundant. For example, in addition to some basic i/o modules, some programmable controllers also have some special function modules, such as temperature detection module, position detection module, PID control module, communication module and so on. The PLC with combined structure is characterized by modules with CPU, input and output. The module size is unified, the installation is neat, the i/o point selection, installation and debugging, expansion and convenience.
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