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An analogue signal is one that has a value that changes over time. They're best depicted as a sine wave-like continuous signal. The value of each point on the wave is accurately determined. Signals from pressure transducers and temperature from thermocouples, for example, can be used as analogue inputs for PLCs.

Electrical engineering is a branch of engineering that deals with electricity. A PLC's hardware components (usually pluggable). PLC cards, for example, house the power supply, the central processing unit (CPU), and "Signal modules," such as analogue or digital input and output modules.

An analogue input transforms a voltage level into a digital value that can be stored and processed by a computer. The voltages can then be easily monitored and read into a computer using various types of hardware, such as a LabJack U3-HV.

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).

The sorts of signals that carry information include analogue and digital signals. The main distinction between the two signals is that analogue signals have continuous electrical signals, but digital signals do not.

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