Abstract
This text introduce based on PLC direct current machine double closed-loop transfer speed to be systematic , transfer speed theory and automatic theory of control system according to direct current, adjust the composition , operation principle and dynamic performance systematic in speed after introducing double closed-loop that PLC controls. System this realize double closed-loop transfer speed carry on transformation of total digitalization systematically to direct current machine, make electric current ring and speed surround controller is it realize to come by PLC system。Is it expand with CPU224 and two , Siemens of S7-200 series PLC module come person who realizes direct current pair close ring transfer speed to be systematic to discuss especially. Use PID function order of PLC to realize the ring of closing of the speed of the direct current machine is controlled. The system has man-machine interface, can carry on the function and parameter to establish to the system , carry on the text display and operate with TD200. The system is easy to expand, easy to expand various kinds of I/O module and function module
Key word: DC Machines;Double Closed-loops;Programmable Logical Control (PLC)