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Chris Takahashi's FA_RADIO #78: PLC backward compatibility and technological innovation challenges In this episode, we will focus on backward compatibility of PLCs (programmable logic controllers) and thoroughly explain its importance and the challenges of balancing it with technological innovation. We will discuss the difference between the user's perspective and the manufacturer's perspective with examples from major manufacturers such as Mitsubishi Electric and Siemens. In particular, we will share specific insights on the impact of function reduction when introducing a new series and the ingenuity of technology introduction using innovation diffusion theory. It is full of information that will be useful for automation engineers and **FA (factory automation)** industry people! Through podcasts, we will deliver hints on solving problems faced in the field. (※ This summary column is based on the transcription content by ChatGPT.)