PROFINET specifies a model for the integration of existing PROFIBUS and other fieldbus systems like INTERBUS and DeviceNet. This allows the construction of arbitrarily mixed systems consisting of fieldbus- and Ethernet-based segments. Thus a smooth technology transition is possible from fieldbus-based systems to PROFINET.

The large number of existing fieldbus systems makes it necessary to support their simple integration into PROFINET for reasons of investment protection. The following cases are distinguished:

• The system operator would like to be able to integrate existing installations into a newly installed PROFINET system easily.
• The system and machine builder would like to use the established, documented device lines unchanged for PROFINET automation projects.
• The device manufacturer would like to be able to integrate existing field devices into PROFINET installations without any costs of change.

Fieldbus solutions can easily and seamlessly be connected into a PROFINET system using proxies. The proxy functions as a representative of the fieldbus device on the Internet. It integrates the nodes connected to the underlying fieldbus system into the overlying PROFINET system. This allows the advantages of fieldbuses like high dynamics, locally exact diagnostics, and automatic system configuration to be used in the PROFINET world without settings in the devices. The transfer of system advantages simplifies planning due to well-understood workflows and the commissioning and operation using the complete diagnostic capabilities of the fieldbus system. Device and software tools are also supported in the usual manner and integrated into the management of the PROFINET system.

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