"PLC的六路抢答器设计：公正竞争与裁决的利器"。

ess activities fair competition and adjudication face a bottleneck, such as many securities companies, stock and fund trading, as well as various intellectual competitions organized by different units. In the face of various obstacles encountered in trading, the buzzer was born. With the continuous improvement of the buzzer, from the initial priority encoder buzzer to the development of a micro buzzer composed of PLC and microcontroller, it simplifies the original complex circuit, speeds up the operation speed, enhances anti-interference ability, greatly improves its reliability, accuracy and functionality. It can better meet the needs of businesses or units for open, fair, and equitable transactions, especially for buzzer needs in knowledge intellectual competitions and other activities, and is highly favored by the general public. This design will use Siemens PLC as the core controller to design a six-channel buzzer. The design content includes the system structure diagram, ladder diagram, program instructions, etc., to control the seat number of the buzzer when the contestants participate in knowledge competitions, promptly and fairly reflect the buzzer's response content and realize the scoring function. Keywords: PLC; ladder diagram; buzzer; programmable logic controller (PLC)