There are two main ways of data communication:parallel communication and serial communication.
Parallel communication is a data transmission method in units of bytes or words.In addition to 8 or 16 data lines and a common line,a control line for data communication is also required.The transmission speed of parallel communication is fast,but the number of transmission lines is large and the cost is high.It is generally used for short-distance data transmission.Parallel communication is generally used inside the PLC,such as data communication between internal components of the PLC,between the PLC host and expansion modules,or between short-range intelligent modules.
数据通信主要有并行通信和串行通信两种方式。
并行通信是以字节或字为单位的数据传输方式,除了8根或16根数据线、一根公共线外,还需要数据通信联络用的控制线。并行通信的传送速度快,但是传输线的根数多,成本高,一般用于近距离的数据传送。并行通信一般用于PLC的内部,如PLC内部元件之间、PLC主机与扩展模块之间或近距离智能模块之间的数据通信。
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