Relationship between Input Channel Excitation Time and Profinet IO Refresh Time

Abstract

Profinet IO is the communication concept for implementing modular, distributed applications such as Profibus DP, based on the Industrial Ethernet. Distributed IO and field devices are integrated into the Ethernet communication by means of Profinet IO. The user data from the field device are transmitted cyclically in a real-time channel to the process image of an automation system. In this paper, I will present what relationship exists between bus refresh time and input channel excitation time in several specific situations.