描述
According to the control process and control law of the system,determine the functions that the PLC machine should have.The functions of different series of PLC machines with different specifications are not exactly the same.For example,some small PLCs only have the logic control function of switching quantity,but do not have the functions of data processing and analog quantity processing.
When a system also requires closed-loop control such as position control,temperature control,PID control,etc.,the template PLC should be considered,and the corresponding I/O modules with special functions should be selected.Otherwise,these algorithms are designed with PLC ladder diagrams.On the one hand,programming is difficult,and on the other hand,it takes up a lot of program space.
要根据该系统的控制过程和控制规律,确定PLC机应具有的功能。各个系列不同规格的PLC机所具有的功能并不完全相同。如有些小型PLC只有开关量的逻辑控制功能,而不具备数据处理和模拟量处理功能。
当某个系统还要求进行位置控制、温度控制、PID控制等闭环控制时,应考虑采用模板式PLC,并选择相应的特殊功能的I/O模块,否则这些算法都用PLC的梯形图设计,一方面编程困难,另一方面也占用了大量的程序空间。
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