Numeric Properties

The numerical properties are available to any tag whose data type is numeric.

Property	Binding Name	Description
Scale mode	ScaleMode	If and how the tag value will be scaled between the source, and what is reported for the tag.
Deadband	Deadband	A floating point value used to prevent unnecessary updates for tags whose values "float" by small amounts.

Scaling Settings

Property	Binding Name	Description
Raw Lo	RawLow	Start of the "raw" value range
Raw Hi	RawHigh	End of the "raw" value range
Scaled Lo	ScaledLow	Start of "scaled" value range. Raw low will map to Scaled low for the tag.
Scaled Hi	ScaledHigh	End of "scaled" value range. Raw high will map to Scaled high for the tag.
Clamp Mode	ClampMode	How values that fall outside of the ranges will be treated. "Clamped" values will be adjusted to the low/high scaled value as appropriate.
Scale Factor	ScaleFactor	For single parameter modes (currently only Exponential Filter), the factor parameter for the equation.

Linear Scaling

The value will be scaled linearly between the low and high values, and clamped as appropriate.

The linear equation is:

ScaledValue = ΔS * (Value-RL)/ΔR + SL

Square root Scaling

The equation for square root scaling is:

ScaledValue = √(ΔS * (Value-RL)/ΔR) + SL

... where ΔS is (ScaledHigh-ScaledLow), ΔR is (RawHigh - RawLow), RL is RawLow, and SL is ScaledLow

Exponential Filter

This mode implements a simple linear recursive filter to smooth values. The scale factor corresponds to the weight of the smoothing effect, and is a value between 0.0 and 1.0. The smaller the factor, the greater the degree of smoothing.

The equation for the filter is:

y(t) = (1-f)*y(t-1)+f*x(t)

With:

•	y(t) = the output at time t.

•	y(t-1) = the previous output

•	x(t) = the input value (current value)

•	f = the scale factor, with 0.0<=f<=1.0

Note: Only "good" quality values are considered for the filter. Bad quality values will be ignored.