The servo motor controller not only includes an amplifier that drives the servo motor, but also contains circuitry to receive sensor signals, control the system, and send signals to a PLC. True or False?

• A. True
• B. False
• C. Not sure
• D. Depends on the model

Answer: (A)

Servo drives are designed as a complete closed‑loop system. They include the power amplifier that supplies motor current, plus circuitry that receives sensor feedback—usually from the encoder—and uses a control processor to run a control algorithm that keeps the motor at the commanded position or speed. The drive then outputs the appropriate torque command to the motor. It can also communicate with a PLC or provide signals to the PLC, enabling monitoring and coordination within the control system. Because of this integrated functionality, the statement is true: a servo motor controller commonly contains amplification, feedback reception, internal control logic, and PLC communication interfaces. In some setups, a separate motion controller might handle high‑level commands, but the typical arrangement matches the description.