The final solution of the servo motor control board is based on the following solutions.

1. Minimum number of pins on the connector from the control board. In which besides `GND` and +24V, there is a movement direction signal `CW` or `CCW`. And an end-of-motion signal `END`. The END signal should allow the control system to register error situations -- for self-diagnosis.
2. The control board must control the 24V voltage to quietly turn on the system.
3. The board must not contain a micro-controller.

Despite the simplicity of the board, I performed a PI/SI simulation to evaluate the result.