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Analog to digital (ATD or A/D)Įlectronic hardware that converts an analog signal like voltage, electric current, temperature, or pressure into a digital number that a computer can process and interpret. Analog signalĪ continuous signal that changes smoothly in a defined range rather than changing suddenly between discrete levels as in digital signals.
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Analog output moduleĪn output circuit that uses digital-to-analog converter to map processor-generated digital count to continuous signal that can be used by the connected analog device. Analog input moduleĪn input circuit that uses analog-to-digital converter to map measured continuous signal to a digital count that can be used by the processor. Its accuracy depends on the resolution of the apparatus. Analog deviceĪn apparatus that measures or generates continuous signal, which is typically in voltage or current. Alternating current (ac) I/OĪn I/O module that converts ac signals originating or received by a field device to appropriate PLC processor logic level signal. AlgorithmĪ procedure for problem solving that is characterized by its time and space complexity as function of the problem size. Warns when process values exceed the process alarm setting, a fixed value independent of set point. AddressĪ numerical identifier for a controller when used in computer communications. ActuatorĪ device connected to an output module, which is able to regulate the behavior of a controlled process variable.
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AccuracyĬloseness between the value indicated by a measuring instrument and the corresponding true value. The number of counted events or timed intervals from a reference time or event mark.