Hardware and software design can pose special challenges and if you do not have in-house resources, you may need to find a supplier to help. A modular solution may well suit your needs if numbers are small. Flexibility is an additional benefit in these circumstances. Maybe your volumes justify a special board design, or custom product. The advantage of collaborating with an external technology or development partner when developing a PROFINET interface is that the device manufacturer can concentrate on its core areas of expertise.
Either way, there are plenty of resources available to help – contact PI North America for guidance. The PI member companies offer a wide range of services during the development phase.