The pulse output voltage specifications of PLCs (Programmable Logic Controllers) vary across different brands and models. Some PLCs can only output 24V pulse signals. 24V pulse output is an industrial standard: most mainstream PLCs, such as the Siemens S7-1200 series (except for the 1217C), Omron NX series, Toshiba G7 series, etc., typically utilize 24V DC pulse output for their transistor output modules. This is the most common voltage level in industrial control because 24V systems offer good noise immunity and driving capability.
However, many servo motors, stepper motors, and brushless DC motors only accept 5V pulse signals. Directly connecting a 24V signal may damage the device. In such cases, it is necessary to convert the 24V pulse signal to a 5V pulse signal.
The following is a low component-count, elegantly designed, and practical interface circuit for this purpose:
Note: If the 4.7K resistor is overheating significantly, replacing it with a 10K resistor can be considered.