1 Overview Special equipment in small, often involved in the control, except the perception component, switch, in general, is servo motor, stepper motor, DC motor, AC motor. Special equipment is usually small mostly uniaxial or biaxial system, namely the single-motor open-loop, closed-loop system or between two motors with the motor system. In these systems as long as the address of the PLC, and motor drive system connected to solve the system control part. 2, constitute a hardware system With the development of modern science and technology, PLC already has two road PIO (square wave pulse output) or PWM (duty cycle adjustment), which controls the entire system with ease. -Grid-align: none "> for general servo motors, stepper motors, their drive to receive the PIO signal, the servo motor, stepper motor speed or position, only to change the number of pulses per unit time. Hardware connection diagram is as follows: For low-power AC motor drive system that is inverter, there are many manufacturers have developed a receiver function of PWM signal converter, AC motor control that would be solved. hardware connection diagram, such as Figure 1. General DC motor control, there are two methods: phase shifting and PWM method. PLC can thus provide PWM signals, self-design a PWM method to control the DC motor drive system. Hardware connection diagram in Figure 2. Solve the control section, control section, how to solve? We can use single chip, touch screen, PC"> And so the communication between PC and PLC to address the monitoring part of the machine. And corresponding to different specialized equipment, only to change the host computer and the PLC s software. So that the design of machine cycles to be shortened, so that the entire machine s reliability has been enhanced. 3, application As a small PLC with Two PIO or PWM output, four high-speed counter input, so the two-axis system, available high-speed counting input time sampling the current speed of motor encoder running through the PLC s powerful digital processing and PID adjustment function, to two-axis movement of a certain relationship between each other so as to complete machine requirements. For many three-axis control system, if the deformation of this approach to be used will be very easy to solve.