ABSTRACT
This chapter focuses on the measurement aspect of the delay and packet dropout of industrial wireless networked control systems. End-to-end measurement provides benefits for realizing the exact delay between any source-destination device pair. While one-end measurement is most suitable for controllers to optimize the control parameters based on the measured average delay in the network. In order to perform delay measurement of a wireless plant, it is assumed that the plant is connected to a wireless node which acts as a communication point for both transmitting and receiving signals to and from the gateway. Network reliability depends on the reliability of the wired and wireless communications. If contention occurs, network delay will increase, causing packet dropout because a scheduled control system can only accommodate certain delay tolerance. Subject to randomly generated payload, the network delays are recorded and analyzed to identify the relationship between the payload length and the induced delays.
