1. Introduction Servo motors are widely used as actuators in automatic control systems, converting received control signals into angular displacement or angular velocity output of the motor shaft. There are three common control methods: 1) Communication mode: Using RS232 or RS485 to communicate with a host computer for control. 2) Analog control mode: Using the size and polarity of an analog signal to control motor speed and direction. 3) Differential signal control mode: Using the frequency of a differential signal to regulate motor speed. Achieving precise control of servo motor speed is a key goal in industrial automation. This paper focuses on using the analog output from a PLC to achieve more accurate speed control of the servo motor. 2. Control System Circuit The control device selected is the Siemens S7-200 series PLC, model CPU224XPCN. It has both digital input/output points and one analog input/output point, making it suitable for controlling the servo motor. The touch screen used is the Siemens TP177B, serving as the human-machine interface. The control scheme is illustrated in Figure 1. The touch screen is where initial commands are entered, which are then sent to the PLC via the communication port. The PLC outputs an analog signal connected to the servo controller’s analog input. The controller processes the signal and drives the motor to reach the desired speed. A feedback mechanism ensures stable performance by comparing actual speed with the target value. Figure 1: Control Scheme
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