Analog signals have several states and are changeable. Temperature, level, and flow rate are all examples of analogue input signals. Analog output signals are also variable and can be utilised for things like adjusting the position of a valve.
The PLC's Analog Input Module (AIN) is a critical subsystem. AINs are used to condition physical parameters in the actual world, such as temperature, pressure, force, and strain. These AIN inputs are typically command signals in voltage (e.g. 10V) and current form (e.g. 4-20mA).
Analog Output Signals include temperature transmitters, thermocouples, pressure transmitters, flow transmitters, level transmitters, and so on.
The analogue input signal passes through an A/D converter (analogue to digital converter) before entering the PLC. This is the PLC analogue input card component that converts analogue signals to digital signals. These digital impulses are what will finally represent our binary value in the PLC.
Switches and push-buttons.
Sensing devices.
Limit switches.
Proximity sensors.
Photoelectric Sensors.
Condition sensors.
Vacuum switches.
Temperature switches.
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