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USER GUIDE
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Revised 2/1/2019
JENE-EG534-V2
Page 22 of 31
Linear Calibration Ext
By default, three of the UI-type OnyxxPoints (ResistiveInputPoint, ThermistorInputPoint, VoltageInputPoint) include
a “linearCalibration” slot containing 4 properties, as shown in
Figure 3-14.
Figure 3-14 Linear Calibration Extension
These properties allow you to “calibrate” the calculated value before it is applied to the Out slot, where:
[(calculatedValue x Scale) + Offset] = Out value.
Usage is optional, although Offset and Units are commonly configured.
Note: In most cases where the parent Onyxx Proxy point’s facets have been edited from defaults, note you must
edit the Units value in the Linear Calibration Ext to match the units in the point facets, otherwise the parent Proxy
point will have a fault status!
Typically, you see this fault status immediately after you add a new input point, for example a VoltageInputPoint or
ResistiveInputPoint, and configure it with a Linear conversion type (including a scale and offset), and then specify
the point’s facets. It may not be immediately clear that the problem is in this Linear Calibration Ext, where you
must match its Units value to the units in the point’s facets.
• Scale - Default is 1.0. Typically, you leave this at default. One exception is if you copied the
LinearCalibrationExt under a
CounterInputPoint, in order to get a scaled total.
• Offset - Default is 0.0. Can be either a positive or negative value, as needed. Often, this is useful to
compensate for signal errors introduced by sensor wiring resistance.
• Units - Set this to the same units as in the parent Proxy point’s facets (see Note: above).
• Fault Cause - Available in AX-3.2 and later. Provides a reason whenever this extension causes the parent
Proxy point to be in fault, e.g.: Units between point and extension are not convertible.
Note: You can also copy the linearCalibration extension without error to other OnyxxPoints based on Numeric
points. For example, a
CounterInputPoint where a “scaled total” out value is desired. Consider a
CounterInputPoint for a flow rate meter that provides a contact closure for every 0.15 gallons, configured as:
• Facets: gallons [units: volume (m^3), gallon (gal)]
• OynxxCounterInputProxyExt:
Conversion: Default
Output Select: Count
Rate Calc Type: FixedWindowRateType
Rate Calc:
Scale: 9.0
Interval: 15s
• LinearCalibrationExt:
Scale: 0.15
Offset: 0.0
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