(Controller Area NetworkUp until now, we’ve considered our embedded control system to be self-contained: an algorithm implemented in software resident on a single microprocessor, communicating with its environment through sensors and actuators via peripheral devices such as an analog-to-digital converter. In fact, many embedded systems are distributed, consisting of multiple microprocessors communicating over one or more networks to accomplish shared tasks. For example, a modern automobile may have seventy or more microprocessors communicat- ing over several networks to manage entertainment and navigation functions, central locking mechanisms, lighting and other vehicle systems. Safety systems such as air bags employ dedicated high speed network communication, as does powertrain control for communication between, for example, the engine and trans- mission controllers.
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