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Analog input zero scale and full scale values

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Configure your analog input’s zero and full scale values.

In most cases the output range of the sensor feeding the analog input matches the hardware limits of your meter’s analog input port. In that case, the analog input’s zero scale and full scale values are the same as the sensor’s represented range. For example:

Analog sensor Meter’s analog input signal Analog input register values

0 - 50 psi represented by a

4 - 20 mA signal

4 - 20 mA analog input range

Input value: 12 mA

Full scale = 50 (psi)

Zero scale = 0 (psi)

Scaled value: 25 (psi)

0 - 50 psi represented by a

0 - 20 mA signal

0- 20 mA analog input range*

Input value: 12 mA

Full scale = 50 (psi)

Zero scale = 0 (psi)

Scaled value: 30 (psi)

If the sensor’s output range does not match your meter’s hardware limits, you must calculate the full scale and/or zero scale values by analyzing the system.

See the ION Reference, available from www.schneider-electric.com, for detailed information about the Analog Input module and full scale and zero scale calculations.

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