A CDE Definition
Beginning to deviate from normal operation. The term is used in industrial control networks when the analysis of data from sensors and nodes or the analysis of calculated summaries derived from data begin to show a deviation trend. See industrial control network.
industrial control network
A network used to connect devices for factory automation and process control applications. Such networks, which are typically referred to as "buses," (Fieldbus, Modbus, PROFIBUS, etc.), are made up of sensors, actuators and controllers. An industrial network provides data link services at layers 1 and 2 of the OSI model and a command set at layer 7. Some functions in layer 3 through 6 may be partially or completely provided. See 4-20 mA, Fieldbus, CAN bus, DeviceNet, PROFIBUS, Modbus and industrial automation.
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