Modern large and medium-sized PLCs are generally equipped with PID control modules for closed-loop process control.When a certain variable deviates in the control process,the PLC can calculate the correct output according to the PID algorithm,and then control and adjust the production process to keep the variable at the set value.At present,many small PLCs also have PID control functions.
现代大中型的PLC一般都配备了PID控制模块,可进行闭环过程控制。当控制过程中某一个变量出现偏差时,PLC能按照PID算法计算出正确的输出,进而控制调整生产过程,把变量保持在整定值上。目前,许多小型PLC也具有PID控制功能。
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