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Revised 2/1/2019
JENE-EG534-V2
Page 18 of 31
Conversion types in Onyxx Driver Proxy points
In any onyxxDriver Proxy point. a Conversion property is available with the following selections:
Note: Currently, Workbench provides no filtering of Conversion types based on the Onyxx Proxy point being
configured. You will see the same Conversion drop-down selection list for a VoltageInputPoint as you do for a
BooleanOutputWritable. However, only a few combinations are typically useful. In addition, there may be
conversion types included that are not applicable, such as “Sm2 Flow Conversion,” which can be ignored.
500 Ohm Shunt
Applies only to a VoltageInputPoint used to read a 4-to-20mA sensor, where the UI input requires a 500 ohm
resistor wired across (shunting) the input terminals. The input signal is 2V to 10V. If this conversion type is not
available, select Linear conversion instead.
As compared to a Linear or Generic Tabular conversion, this selection provides better resolution near the upper
(20mA/10V) range of the input, compensating for input clamping protection the circuitry automatically applies
when input voltage rises above 3.9V.
Note: Currently, selection of 500 Ohm Shunt produces a “secondary” selection for conversion type, with all
conversion types shown again. Typically, only the Linear type is valid, providing the 4-20mA sensor has a
linear response. In the Scale and Offset fields for this Linear conversion, you enter whatever calculated values
are needed to display in the appropriate units of measurement for that sensor.
Figure 3-12 shows an example
configuration of such a point.
Figure 3-12 Example VoltageInputPoint used for 4-to-20mA input (Edit dialog from Point Manager)
For background on this example configuration, see “Scale and offset calculation example 2”.
In the unusual case of a non-linear 4-20mA sensor, the secondary conversion type “Generic Tabular” can be used.
Default
(The default selection)
Conversion between “similar units” is automatically performed within the Proxy point. For example, if the “units”
facets of a
ThermistorInputPoint is set to degrees F, the point output automatically converts to the appropriate
value, from degrees C.
If you set the Parent point’s facets to dissimilar units (often the case with a VoltageInputPoint), the parent point
has a fault status to indicate a configuration error. In this case, you must select Linear conversion, and also set
“Units” in the point’s “LinearCalibrationExt” to match the point’s facets. See “Scale and offset calculation (linear)”
on page 19 and “Linear Calibration Ext” on page 22.
Generic Tabular
This Conversion type allows nonlinear support for devices other than for thermistor temperature sensors with units
in temperature. Generic Tabular uses a “lookup table” method similar to the “Thermistor Tabular” conversion, but
without predefined output units. Selection provides a popup
Tabular Conversion Dialog in which a custom
“source-to-result” non-linear curve is entered, including the ability to import and export response curve files. For
more details, see “Non-linear sensor support” on page 20 and “Curve File Import/Export notes” on page 28.
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