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Comparison Of Motion Controller And PLC
- Sep 20, 2018 -

Introduce of Motion Controller

Motion controller is a special controller that controls the operation mode of the motor: for example, the motor controls the AC contactor by the travel switch to realize that the motor drags the object up to the specified position and then runs downward, or uses the time relay to control the motor to reverse. Or turn around for a while and then turn around for a while and then stop. The application of motion control in the field of robots and CNC machine tools is more complicated than in specialized machines, because the latter is simpler in motion and is often referred to as General Motion Control (GMC).

Motion controller

Features of Motion Controller

(1) Hardware composition is simple, the motion controller is inserted into the PC bus, and the signal cable can be connected to form a system;

(2) It can be developed using a wealth of software already available on PCs;

(3) Code control software has good versatility and portability;

(4) There are many engineers who can carry out development work, and they can develop without much training work.

Introduce of PLC

Programmable Logic Controller is a digital computing operation electronic system specially designed for application in industrial environments. It uses a programmable memory that stores instructions for performing operations such as logic operations, sequence control, timing, counting, and arithmetic operations, and controls various types of mechanical equipment or production through digital or analog input and output.

PLC

Features of PLC

(1) High reliability. Since PLC uses a single-chip microcomputer, the integration is high, and the corresponding protection circuit and self-diagnosis function improve the reliability of the system.

(2) Easily Programmed. PLC programming mostly uses relay control ladder diagrams and command statements, the number of PLC is much less than that of microcomputer instructions. In addition to medium and high-end PLCs, there are only about 16 small PLCs in general. Due to the simplicity of the ladder image, it is easy to grasp, easy to use, and even requires no computer expertise to program.

(3) Flexible configuration. Since the PLC adopts a modular structure, the user can flexibly change the function and scale of the control system simply by combining, so that it can be applied to any control system.

(4)Completed input/output function modules. One of the biggest advantages of PLC is that for different field signals (such as DC or AC, switching, digital or analog, voltage or current, etc.), there are corresponding templates for industrial devices (such as buttons and switches). , sensor current transmitter, motor starter or control valve, etc.) are directly connected and connected to the CPU board through the bus.

(5) Easily installed. Compared with computer systems, PLC installation requires neither a dedicated machine room nor strict shielding measures. When you use it, you only need to connect the detection device to the I/O interface terminal of the actuator and PLC correctly, and it can work normally.

(6)Fast running speed. Since the control of the PLC is controlled by the program, regardless of its reliability or operating speed, the relay logic control cannot be compared. In recent years, the use of microprocessors, especially with the large number of single-chip microcomputers, has greatly enhanced the capabilities of PLCs, and the difference between PLCs and microcomputer control systems has become smaller and smaller, especially for high-end PLCs.

Difference between Motion Controller and PLC

Motion control mainly involves the control of stepper motor and servo motor. The control structure mode is generally: control device + driver + (step or servo) motor.

The control device can be a PLC system or a dedicated automation device (such as a motion controller, motion control card). When the PLC system is used as a control device, it has the flexibility and certain versatility of the PLC system, but it is very difficult to achieve or program the requirements with high precision, such as - interpolation control, and the reaction is sensitive, and the cost may be high. 

With the advancement of technology and technology accumulation, motion controllers have emerged, which solidify some universal and special motion control functions - such as interpolation commands, users only need to configure and call these function blocks or instructions. This reduces the difficulty of programming, and has advantages in terms of performance and cost.

It can also be understood that the use of PLC is an ordinary motion control device. The motion controller is a special PLC that is dedicated to motion control.