Industry 4.0 standard – is there such a thing ?

There is however a set of design principles that define Industry 4.0:
Interoperability: The ability of machines, devices, sensors, and people to communicate with each other over the Internet.
Information transparency: The ability to capture activities of machines through electronic sensors, store this data, and process it for other purposes.
Technical assistance: First, the ability to support humans by reporting and alerting, so that humans can and take decisions. Second, the ability to support humans by performing tasks that are unpleasant, exhausting, or unsafe.
Decentralized decisions: The ability to make decisions and perform tasks as autonomously (independent of humans) as possible. Decisions and tasks are delegated to humans only if they are very difficult or involve conflicting goals.

The extent to which each of these principles is implemented can vary, and will increase as years go by, as technology advances.

There are a lot of evolving standards for the different components of Industry 4.0 (sensor, Cloud, IOT, etc.) and the manner in which they communicate (the protocols, security, etc.), but there is no standard that says “This is Industry 4.0, while this is not”. If there is a system that follows the design principles enumerated above, it is Industry 4.0.  

Industry 1.0 (a newly coined term) is the use of steam in industry 230 years ago. Just like there is no Industry 1.0 standard in terms of how many machines ran on steam and how much steam was used, there is no ‘conformance’ to Industry 4.0 standard.