According to Elektronik Praxis, if we consider from an external point of view, the external device and machine communication which no matter running on an operating system in a machine or with a special real-time implementation is not visible to outside in an industrial 4.0 compatible device.
The operating system can be selected for example with a control system manufacturer that is subjected to criteria that provide the actual basis for the functionality of differentiating machine.
The availability in long support, exemption from IP policies, an excellent software toolchain for simple engineering, scalable use from the smallest embedded system to multi-core systems which are many for example, the factors that can differentiate one manufacturer controller from another.