An embedded system is a combination of software and hardware to perform a specific task at a instant of time.
There are two types of embedded system:
- Real-Time
These are the system in which the output has to reach the desired set-point within an allocated time. - Non Real-Time
In the system the output doesn’t depend on the input. There is no time window allocation for the performing of task.
An embedded system can be distributed. A distributed embedded system is the one in which you can externally add or subtract specifics components. Example: consumer PC etc.
All the principles of control system directly affect the embedded system.
An Embedded system can be designed in two ways:
- Standalone mode
In standalone mode, the system does all the work independently and doesn’t rely on any other external resources. - Distributed mode
In distributed mode, the system is a subset and depends on other subsets.
A processing element can be a self-contained unit or it may be spread across physically. example: AMD Sempron 145 is a self-contained unit whereas relay based processing element is physically spread across space.
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