PROFINET does not offer a direct process automation connection because the fieldbus solution provided by PROFIBUS PA already delivers a highly successful alternative.  Instead, PI offers an easy way to integrate existing PROFIBUS PA networks into PROFINET.  Not only does this allow current investments to be fully utilized, it also means PROFINET can become the platform for enterprise-wide integration of process plants so that ERP and MES functions can be more effective.

Connectivity between PROFINET and PROFIBUS PA is achieved using a 'proxy' or 'black-box' solution for connecting the two networks (see above - click image to get a larger version). 

The 'proxy' solution is one of the strongest differentiators for PROFINET. It can be used to include other networks in a PROFINET system and proxies exist for PROFIBUS PA and most major fieldbus competitors.

PROFINET's proxy approach to automation is explained more fully here.

Ten reasons for choosing PROFINET

• All the reasons for choosing PROFIBUS, plus …
• Seamless enterprise-wide integration, global accessibility.
• Unlimited node count, powerful capabilities, greater scalability.
• Full TCP/IP, internet and web compatibility, with real-time determinism
• Ethernet cabling eases installation, and familiar IT and Internet tools help during operation, maintenance and diagnostics.
• Wireless and functional safety easily added.
• Protects investments in plant and people by easily integrating all popular automation networks.
• Strategic links with PROFIBUS include common infrastructure, common engineering platforms, common quality assurance and common application profiles.
• Modular, flexible, comprehensive – use only what you need now.
• Easily extended and expanded as enterprise needs change.