What is a servo drive?
It is a dedicated controller that controls the operation of a motor. For example, it can control a motor via limit switches, control an AC contactor to move an object to a designated position and then stop, or use a time relay to control the motor's forward and reverse rotation, or to rotate intermittently and then stop. Motion control applications in robotics and CNC machine tools are more complex than in specialized machines because the latter have simpler motion patterns and are often referred to as general motion control (GMC).
Features of Servo Drivers
1. Simple hardware configuration: Simply plug the servo driver into the PC bus and connect the signal lines to form a system.
2. Can utilize the rich software already available on the PC for development.
3. Motion control software boasts good code universality and portability.
4. A large number of engineers are available to perform development work, requiring minimal training.
What is a PLC?
A Programmable Logic Controller (PLC) is a digital electronic system designed for industrial applications. It uses programmable memory to store instructions for performing logical operations, sequential control, timing, counting, and arithmetic operations, and controls various mechanical equipment or production processes through digital or analog input/output.
Features of a PLC
(1) High Reliability. Most PLCs use microcontrollers, resulting in high integration. Combined with appropriate protection circuits and self-diagnostic functions, this improves system reliability.
(2) Easy Programming. PLC programming primarily uses relay control ladder diagrams and instruction statements, far fewer than microcomputer instructions. Except for medium-sized PLCs, small PLCs typically have only about 16 units. Because ladder diagrams are simple, easy to understand, and easy to use, even those without computer expertise can program them.
(3) Flexible Configuration. Due to its modular structure, PLCs allow users to flexibly change the function and scale of the control system through simple combinations, making them applicable to any control system.
(4) Complete Input/Output Function Modules. One of the biggest advantages of PLCs is that they have corresponding templates for different field signals (such as DC or AC, switching, digital or analog, voltage or current, etc.), current transmitters, motor starters, or control valves. They can be directly connected to the CPU motherboard via a bus.
(5) Easy to install. Compared to computer systems, PLCs do not require a dedicated computer room or strict shielding measures. During use, simply connect the detection device to the actuator and the PLC's I/O interface terminals correctly for normal operation.
(6) High operating speed. Because PLC control is program-controlled, both its reliability and operating speed are unmatched by relay logic control. In recent years, the use of microprocessors, especially the large-scale adoption of single-chip microcomputers, has greatly enhanced the capabilities of PLCs, making the difference between PLCs and microcomputer control systems increasingly smaller, especially for PLCs.