PROFINET I/O Industrial Module with 6 Isolated Digital Inputs and 6 Relay Outputs. PROFINET is an open Industrial Ethernet standard developed by the PROFIBUS Organization (PI). Based on the versatility of Ethernet, PROFINET makes vertical integration of field level to Enterprise level easily. PROFINET has good performance in real-time and stability for communication, so it can cover all requirements of the Automation Industry. PROFINET is perfect..