Every machine or system has a controller. Dependent on the technology type used, controllers can be separated into hydraulic, pneumatic, electronic and electrical controllers.
Often, a mixture of different technologies is applied. Moreover, differentiation is created between hard-wired programmable (e.g. wiring of electro-mechanical or electronic components) and PLCs. The initial is utilized principally in cases, where any reprogramming by the user is out of the query and the task size guarantees the development of a special controller.
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