Motion control card is based on PC bus, using high performance microprocessor (such as DSP) and large-scale programmable devices to achieve multiple servo motor multi-axis coordinated control of A high performance stepper/servo motor motion control card, including pulse output, pulse count, digital input, digital output, D/A output and other functions. It can send out continuous, high frequency pulse train, by changing the pulse frequency to control the speed of the motor, by changing the number of pulses to control the position of the motor, its pulse output mode includes pulse/direction, pulse/pulse mode. Pulse counting can be used for position feedback of the encoder to provide accurate position of the machine and correct errors during transmission. Digital input/output points can be used for limits, origin switches, etc. Library functions include S – type, T – type acceleration, linear interpolation and circular interpolation, multi – axis linkage function, etc. The products are widely used in the field of industrial automation control requiring precise positioning, fixed length position control system and PC-based NC control system. Specifically, it integrates the underlying software and hardware to realize motion control, so that it has various speed and position control functions required by servo motor control, and these functions can be easily called through the computer. In a motion control system, the motion control card is the core module of the control system, which is also the most closely coupled with the design purpose of the control system. Once the motion control card is selected, other designs should be selected and designed around the motion control. Therefore, how to choose the motion control card is very important for the design of the motion control system.

1. Working principle of motion control card

Motion control card is a motor motion control card based on bus. The special control chip is used as the core device, and the input and output signals are photoelectric isolation. It can be connected with various types of stepper motor drivers to drive the stepper motor to form a high-precision position control system or speed control system. It can be combined with computer to form master-slave control structure: computer is responsible for man-machine interface management and other management work; And the motion control card takes care of all the details of motion control. Motion control card users can easily and quickly develop their own motion control functions through the dynamic link library provided by the manufacturer.

2. Use advantage analysis of motion control card

As an upper control unit based on PC, motion control card has greater flexibility and openness in the development process of special aircraft system. Users can develop powerful motion control system in a short time. Because of the above characteristics, professional motion control card is not only widely used in the machine tool industry, but also widely used in many small special aircraft systems. Link library (DLL), users can quickly develop their own motion control system under the condition of Windows system. Moreover, in view of the multi-task mechanism of Win, the motion control card adopts Virtual Device driver (VXD) technology, which solves the real-time problem of the control system under the condition of Win well. When the program is initialized, use the declaration module (MPC01. BAS), after the dynamic link library is linked in the form of a header file, the user can call the motion control function of the board as if it were an internal Windows function.