Based on Simens PLC and its network direct current velocity modulation system
Abstract: Is coaxial actuates a alternator based on Simens PLC and its the network direct current velocity modulation system by a direct current motor, the direct current motor to actuate with the direct current velometer and to be loaded with revolves the encoder examination rotational speed; The generator electricity generation voltage after the numeral demonstrated the table demonstrated and delivers to the PLC simulation quantity load module. According to the hypothesis voltage value and the examination voltage value comparison after the PID computation the output signal for the direct current governor control direct current machine rotational speed, cuts the load resistance artificial perturbation, the system automatic control direct current motor rotational speed, causes the output voltage to be constant is supposing the definite value; The generator output load for divides into three groups to be allowed the manual cut resistance group, the load current demonstrated by the digital ampere meter. And through miniature machine, PLC and industry ethernet, field bus control system realization entire production process automation.
The system configuration and the user program compilation completes by STEP7 software, the process on position machine monitoring as well as touches the screen using group too king software, the realization produces the scene the tendency long-distance monitoring. The good man-machine contact surface, the clear configuration graph, cause the operator through the computer screen, changes clear regarding scene each kind of operating mode.
Key word: Simens PLC, industry ethernet, field bus, STEP7, group too kings, direct current velocity modulation system