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Definition of "programmable logic controller (PLC)" |
a microprocessor based system comprised of a set of modules for acquiring signals from environment and other for producing effects on the environment. These effects are typically used for controlling electromechanical machines by means of actuators (motors, heating element, etc.). The rules for specifying the control law are Boolean expressions. These sequentially and cyclically are executed. More complex PLCs allow the description of the control law by means of ladder diagram. |
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