Honeywell Series 8 I/O - Determining Linear Conversion; Determining Square Root Conversion

6. Series 8 I/O Configuration
6.7. Defining Analog Input Channel Blocks
R500 Series 8 I/O User's Guide 185
April 2017 Honeywell
PVRAW = PV received from field and converted to digital form by the A/D converter
Note:
When 4-20mA signal is connected to ANALOG INPUT WITH HART or ANALOG INPUT, the
Sensor Type 1_5_V should be used.
Determining Linear Conversion
The PVRAW value is converted to a floating-point number. The output value of the
linear conversion is PVCALC, which is calculated based on the raw input span (for 0-100
mV sensor type only), and the engineering unit span.
The state of the input direction parameter (INPTDIR) is acquired into consideration
during the calculation of PVCALC as follows:
Determining Square Root Conversion
The square-root calculation is applied to the PVRAW input such that 100% of span = 1.0
The square-rooted value is then converted to engineering units based on the configured
PV engineering-unit range values.
(For example, square root of 100% = 100%; square root of 50% = 70.71%.)
The output value of the square-root conversion is PVCALC, which is calculated based on
the state of the input direction parameter (INPTDIR) is as follows: