All PROFINET components have two associated IDs: A Vendor ID and a Device ID. Device manufacturers must obtain a Vendor ID and define a Device ID before testing since both IDs are included in the device’s GSD file. Vendor IDs are unique, and therefore managed and assigned by PI to each company. Device manufacturers can obtain their PROFINET Vendor ID at no charge by sending an email to: certification{AT}profibus.com. Vendor IDs are the same for PROFIBUS, PROFINET, and IO-Link. If a device manufacturer already has a Vendor ID for PROFIBUS, there is no need to request a new one for PROFINET. The Device ID is chosen and managed by the device manufacturer. Each device should have a unique Device ID specifically for the device. The “GSDML Technical Specification for PROFINET” document in the PROFINET IO Test Bundle contains details about Device ID formatting.