What is a special I/O module that sends out a train of pulses to a motor called?

The correct answer is the stepper control module, which is specifically designed to send out a series of pulses to control the position and speed of stepper motors. Stepper motors operate by receiving discrete pulses: each pulse corresponds to a fixed movement angle, allowing for precise control of the motor's position. The stepper control module generates these pulses at specified intervals to ensure accurate movement according to the programmed parameters.

This module is essential in applications requiring fine-tuned motion control, such as robotics and CNC machines, where maintaining precise positions is critical. Other modules mentioned may serve different purposes, such as regulating frequency or controlling power through pulse-width modulation, but they do not specifically create the pulse train necessary for stepper motor operation.

Understanding the unique functions of each module helps clarify why the stepper control module is precisely what is needed for driving a stepper motor with a train of pulses effectively.