The first PLC was Modicon. GE later bought out Modicon. But at the beginning they were not associated with each other at all. Please do not give GE credit for something they were not even interested in.

this was very fluent and informative, thanks ! those were global subjects on among other things why isolated networks are important , can you recommend on first steps of learning materials or certification in the field? not only in cloud technology such as Azure?

How to spend 38 minutes saying that you are vastly superior to manufacturing engineers and belittle their work. You really should spend real time in manufacturing environments beyond petroleum. PLC's are not the stupid little devices you make them out to be. OT bandwidth is a real concern. Speed in important for safety. S7 is a weak European attempt at PLC's so if that is your reference, I can almost understand your attitude. Ladder Logic is the app. The programming software is also an app. Communications protocols vary greatly and while different from standard IT, they are sophisticated beyond basic ethernet. In fact, if you are working only on ethernet and TCP/IP protocols, you are missing a great majority of industrial networks. This is typical of IT professionals. Microsoft certainly wants control of everything, but you have a long way to go before you are industry ready. As for your turn it off and restart comment, this has very little affect on PLC's. In fact, you are not playing with Windows anymore. Troubleshooting in most manufacturing facilities is far more robust, and requires far better results than you Windows jockies are capable of producing. Once again, I don't "Reboot" PLCs. That is a certain way to lose valuable information needed to solve the problem. Also, most manufacturers do not live in the "BlackBox" world you speak of. In fact most manufactures have their own controls people taking care of programming and day to day business. As for the IT professionals out there, do not mistake this as a solid strategy for industrial OT network security. OT security is complex and likely beyond your usual networking world. The "simple, little OS" this guy mentions is perfectly suited to the controls world. While it is small and lightweight, it is extremely efficient and unlike Windows, you do not have to reboot it when it quits working. Truth is, they don't stop very often. I have PLCs that have been running for years/decades. Do yourself a big favor and talk to the people in charge of the controls in your facility. I promise you they have specific demands and information that you will need to provide connections to the OT network. If the OT network is not separated from the business network, you will have issues. The two are very different in purpose. That is about the only thing the Microsoft blowhard got correct.