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The Distributed Processing Units
The physical process interfacing and the remote processing such as monitoring and control of the subsystem are provided by means of Distributed Processing Units (DPU) DPUs are available in different versions in form of digital and analogue input and output modules of different data width (16/32 bits) for digital modules, respectively different number of channels (8/16) in case of analogue modules. Specific system functions are provided by means of dedicated DPUs like units for Generator Control & Protection. Fig. 3 shows a DPU for Analogue Inputs.
In addition to the process interfacing function of normal DPUs, the so-called " Intelligent Distributed Processing Units" provide data processing capability based on programmable logic functions. These modules are also able to operate as so-called " MMI-Server" for simple operator interfaces (LOS) (will be explained later).
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