The digital twin is cybernetic form also known as virtual copy of the real physical system. It is possible to say every real system can be built in form of its virtual nodel. The design of digital twin model is usually started as the very beginning project phase. There is several direction of digital twin model utilisation. E.g. in the case of control system development testing existing digital twin gives possibility to start virtual commisioning much earlier than real HW technology is fully equipped and operating on the site. Digital twin can be also used as the template for particular production system designed. Digital twin in its virtual form does not disappear. It stays alive and as living part connected to the real physical system in the future.