Implementation of Networked Control System using a Profibus-DP Network
Kyung-Chang Lee, Suk Lee · 2002
As numerous sensors and actuators are used in many automated systems, various industrial networks are adopted for real-time distributed control. In order to take advantages of the networking, however, the network implementation should be carefully designed to satisfy real-time requirements considering network induced delays. This paper presents an implementation scheme of a networked control system via Profibus-DP network for real-time distributed control. More specifically, the effect of the network induced delay on the control performance is evaluated on a Profibus-DP testbed. Also, two conventional PID gain tuning methods are slightly modified for tuning controllers for the networked control system. With appropriate choices for gains, it is shown that the networked control system can perform almost as well as the traditional control system. Keywords: Networked control system, Profibus-DP, Fieldbus, Network induced delay, Industrial network 1.