How scaling works in PLC?

Converting the input ( analog voltage 0 to 10V / current 4 - 20 mA) into the understandable engineering values as per industry standard ( analog voltage 0 to 10V / current 4 - 20 mA) is called “ SCALING ” .

The Input instrument which is producing analog values( for eg. 0–10V) is give to Analog Input Module. This module converts that analog values into counts/raw value (i.e) 0 to 32768.

Whenever the input instrument produces 0V our PLC reads 0.

Similarly , Input Instrument 5V = PLC reads 16384.

Input Instrument 10V = PLC reads 32768.

So using this raw value , we can scale our PLC to convert the Input to Output as engineering values as per industry standard so that we can control the output device.

Author - Monish Kumar M

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