PASSIVE MONITORING OF CONTROL LOOPS IN BUILDING AUTOMATION

The monitoring of control loop performance in building automation is important for decreasing the maintenance costs. Passive monitoring with network analyzers is inexpensive and does not influence the network load. However, control signals that are not transmitted over the network are unobservable. This paper purposes an approach to the reconstruction of missing control signals and the computation of control loop performance parameters. The analysis algorithms are adapted to the non-uniform sampling that is widely spread in building automation. Further, criteria of loop performance and network traffic for passive monitoring are introduced.