Mitsubishi's programming software is from the early fxgpwin to the recent gx8.0 (the latest known by Xiaobian). Like all Japanese brands, the programming idea of this software is a single vertical structure from top to bottom, while Siemens' microwin is a structure with both vertical and horizontal structures. Moreover, the subroutine supports local variables, and the same function only needs to be programmed once, which greatly reduces the difficulty and time of development. 2. S7-200 has always supported powerful floating-point operation, and the programming software directly supports decimal point input and output. Mitsubishi didn't have this function until the FX3U series launched in recent years. The floating-point function of the previous FX2N series is false. 3. The analog input and output program of S7-200 is very simple and convenient. AD and Da values can be accessed directly without programming. Mitsubishi FX2N and its previous series require very cumbersome fromto instructions. FX3U now supports this function, but it is five years or more late. 4. Of course, Mitsubishi FX2N series also has its own advantages. First, the high-speed counter instruction is more convenient than S7-200, and second, the 422 port is more compact than Siemens' PPI port (because the PPI port of 200 series is non photoelectric isolation, non-standard operation and imitation programming cable may cause serial port damage). The above comparison is only for small computers. As for Siemens' 300 and 400 series and larger TDC series, there is no need to say more here. Mitsubishi is easy to learn PLC, because it is straightforward and simple, but from the perspective of learning, Siemens is definitely better.