4400 网络通信模块4400模块是将PLC的各功能的单元分别做成象积木一样的模块，可以根据需要进行组合，以适应各种不同的需求。
4400可编程逻辑控制器是种专门为在工业环境下应用而设计的数字运算操作电子系统。它采用一种可编程的存储器，在其内部存储执行逻辑运算、顺序控制、定时、计数和算术运算等操作的指令，通过数字式或模拟式的输入输出来控制各种类型的机械设备或生产过程4400当可编程逻辑控制器投入运行后,其工作过程一般分为三个阶段， 即输入采样、用户程序执行和输出刷新三个阶段。完成上述三个阶段称作一个扫描周期。在整个运行期间，可编程逻辑控制器的CPU以一定的扫描速度重复执行上述三个阶段。
The 4400 module is a modular design that combines the various functional units of a PLC into building blocks that can be combined according to different needs.
The 4400 programmable logic controller is a digital operation electronic system designed specifically for application in the I industry environment. It adopts a programmable memory that stores instructions for executing logic operations, sequential control, timing, counting, and arithmetic operations internally. It controls various types of mechanical equipment or production processes through digital or analog input and output. When the programmable logic controller is put into operation, its working process is generally divided into three stages, namely input sampling, user program execution, and output refresh. Completing the above three stages is called a scanning cycle. During the entire operation period, the CPU of the programmable logic controller repeatedly executes the above three stages at a certain scanning speed.
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