This paper provides a passivity based framework to synthesize lm2-stable
digital control networks in which m strictly-output passive controllers can control n−m
strictly-output passive plants. The communication between the plants and controllers
can tolerate time varying delay and data dropouts. In particular, we introduce a power
junction which allows even a single controller (typically designed to control a single
plant) to accurately control the output of multiple plants even if the corresponding
dynamics of each plant is different. In addition to the power-junction we also introduce
a passive downsampler (PDS) and passive upsampler (PUS) in order to further reduce
networking traffic. A detailed (soft real-time) set of examples shows the tracking
performance of the networked control system.