HomeHeatingSystem

A typical example of a control process with a working and a shutdown behaviour. The active behaviour is determined by the current state of a heat management process.

The example shows a part of the ubiquitos HomeHeatingSystem. We present the interaction net and the master-slave hierarchy graph of the HeatControl cluster. Additionaly, the state transition diagrams of the master process Manager and of the slave process H_Controller is shown.

CLUSTER HeatControl

INTERACTION NET	MASTER-SLAVE GRAPH

The H_Controller process interacts with processes controlling the blower, the ignition and the oilflow devices of a heating system. The active mode of this process is determind by the current state of the manager Process.

MODE working

MODE shutdown

The modes working and shutdown define two behaviours of the H_Controller process. The start and stop pulses are triggers sent by the Manager process. The activate and the deactivate pulse from the Boiler process inform the H_Controller about desired heat.

MODE normal

The process Manager is responsible for startup and shutdown. This process is specified as master of the H_Controller process. Thus the current state of the Manager determines the active mode of the slave H_Controller (MODE SETTING table): When the Manager is in the state lowHeating or highHeating, the H_Controller acts in the working mode. As soon as the Manager goes to the idle state, the H_Controller switches to the shutdown mode. (The low and high pulses sent by the Manager are used to influence the Boiler Process.)