Mitsubishi electronic automation and chemical company has launched a new generation of Q series PLC system, which is programmed with windows programming software tools. The data is transmitted through USB interface. It supports Internet e-mail modulation, demodulator and 10 / 100MB / s network functions, can be connected to device network, PROFIBUS, CC link, and net / 10, and can allow no more than 252 programs to run in each CPU, in addition, it is very small