Abstract : In today's industrial control, learning and mastering PLC control technology and variable frequency speed control technology is essential. Our developed PLC integrated control training device can perform both extensive automatic switching control and analog variable frequency speed control closed-loop automatic control, meeting the needs of engineering students in cultivating comprehensive design , application, and innovative research abilities, and enhancing their adaptability to society. Keywords : PLC controller and frequency converter; engineering quality cultivation; experimental system design; ladder diagram programming Keywords : PLC controlling frequency training, experimental desk system design, trapezoidal graph 1. Overview Programmable logic controllers (PLCs) are a new type of industrial control system integrating computer technology and automation control technology. PLCs perform sequential control, counting, logical judgment, and arithmetic operations to solve numerous switching control problems in industrial control systems. They use an easy-to-understand and master ladder diagram language and simple instructions, making them visually intuitive. They offer advantages such as high reliability, strong anti-interference ability, low failure rate, convenient parameter setting, and ease of operation and maintenance. They are gradually replacing large, energy-intensive, and prone to failure relay control systems. The energy-saving, motor soft-start, and complex analog signal processing advantages of variable frequency speed control technology have led to its widespread application in today's rapidly developing high-tech world. [b][align=center]For more details, please click: Application of Computer Technology and PLC Control in Electromechanical Training Devices[/align][/b]