A field device includes a power control module, a network interface module that communicates over a wireless network, and a device interface module for operating transducers, such as a sensor or an actuator. The power control module controls distribution of electrical power so that the network interface...http://www.google.de/patents/US20080081676?utm_source=gb-gplus-sharePatent US20080081676 - Power management system for a field device on a wireless network
