A Programmable logic controller (PLC) and a motion controller are types of control systems to control operation of mechanical systems, but they have some key differences.
A PLC is a type of industrial computer that is designed to control industrial processes and machinery. It is a general-purpose controller that is programmable and can be used to control a wide range of industrial processes, such as the control of temperature, pressure and flow. PLCs are typically used in applications that require simple control logic and basic motion control.
A motion controller, on the other hand, is a specialized type of controller that is specifically designed to control the motion of electro-mechanical systems. It typically uses advanced algorithms to control the movement of the system and can control multiple axes of motion at once. Motion controllers typically are used in applications that require precise and high-performance motion control, such as robotics, machine tools and automated manufacturing systems.