modules are devices that are Input Output to a SCADA. Inputs are Temperature, Pressure, Flow rate, Humidity, Level etc called as Analog Inputs. Inputs from Flow switches, level switches, Pressure switches, Proximity switches, Limit switches, auxiliary contact of contactor etc are called Digital Inputs. Outputs are analog signals like 4-20mA or 0 to 10VDC or digital signals like pulse output, relay output etc.
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