Analog Devices in HVAC Controls

Analog devices in controls:

Inputs and outputs are a core fundamental with controls. 

Another is Analog and Binary signals. Lets focus on analog signals today.

Old school analog devices were gauges with a mechanical needle that swings to give a reading. 

But we’re talking electronic control systems so our use of the term changes a little. 

Analog is a signal that can scale from 0% to 100%. 

It doesn’t matter if it’s temp, pressure, position, speed, etc. 

This is true whether it is an input or output. 

I use the term signal here because these I/O can be a reference from a sensor or a command signal. 

In summary, if the signal is adjustable or floating between 0% to 100% of the signal range then it is a analog I/O. 

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