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I am an electronic engineer in the field of digital isolators. In recent days in my spare time, I make a project for new digital isolators on my own and in the process of making, I found one magical case that new digital isolator enhances PLC performance. Today I come to this forum to turn to you to discuss my understandings are appropriate. The project for new digital isolators begins now: Four major technical challenges in industrial automation In order to help the industry to accelerate the implementation of related solutions, this paper in addition to the industrial automation target market for isolation applications, focusing on programmable logic controller (PLC) and factory automation development of detailed market and technical analysis, but also a detailed description of the new Complementary metal-oxide-semiconductor (CMOS) digital isolators compared to traditional optical coupling isolation solutions for industrial automation applications brought significant advantages. Many of the technical challenges involved in the development of industrial automation include: 1st, Equipment security can not compromise The Security features are critical. The The product must be stable under high stress. 2nd, Normal work in high-noise environments The The external electrical / magnetic field of the factory has high anti-interference. The High voltage transient noise has strong anti - interference ability. 3rd, Long product life The The entire temperature range, different VDD voltage, and long-term use, the key parameters must be stable. The Under high stress, the product has a long service life. 4th, High performance The Product performance must be the world's top. The Low latency and low latency bias to ensure high efficiency and throughput. Based on the above technical challenges, high-performance isolation products for industrial automation must also be highly safe, highly resistant to interference and long life. There are many high-voltage equipment in the factory, through the isolation program can not only protect the electronic systems and personnel, but also to suppress noise to ensure the reliability and stability of the equipment. With the industrial automation applications to improve the performance requirements of related equipment, built-in isolation technology has begun to change, the traditional isolation using optical coupling technology, due to inherent characteristics gradually difficult to meet the needs of industrial automation design, including poor reliability, timing characteristics Poor, non-surplus common mode transient noise immunity (CMTI), low energy efficiency, so that the industry began to look to the new CMOS capacitor-coupled digital isolator program. The use of differential capacitive coupling technology CMOS digital isolator is highly efficient CMOS digital isolator using switch key modulation technology CMOS design, and the use of differential capacitive coupling, can achieve high reliability and stability, not with the temperature, operating voltage and product life and change, in addition to excellent timing characteristics, Including low transmission delay, low transmission delay deviation and so on. More importantly, the CMOS digital isolator has a high common mode transient noise immunity (CMTI) and requires less power than the optocoupler, thus reducing overall system power consumption. Figure 1 and Figure 2 for the traditional optocoupler and CMOS digital isolation scheme comparison. Ps: Excuse me if I was wrong in words or expressions as I am a green hand in the field of new digital isolators. I need continual learnings. What is your idea ? Do you agree with my ideas ? Any of your ideas would be highly appreciated. May someone would like to help ? thanks in advance.