PROFIBUS & PROFINET International (PI) is the international umbrella association for 25 regional PROFIBUS & PROFINET Associations including the user organization PNO, which spells out as PROFIBUS Nutzerorganisation e. V. It runs an office that manages joint projects and disperses information to members and other interested parties. A certification center for PROFIBUS and PROFINET product approvals is affiliated with that office. Adopted on 24 April, 1996, the organization‘s bylaws specify its duties and responsibilities. Membership is open to all companies, associations, and institutions that support the interests of PI as device vendors, users, systems solution providers or operators of PROFIBUS or PROFINET networks.