Voltage Output points

This is a NumericWritable point that represents a 0-to-10Vdc analog output (AO).

Figure 438. Voltage Output tab

You access it from the Nrio Point Manager, Analog Points tab by clicking the hyperlink on a Voltage Output point.

Property	Value	Description
Facets	additional properties	Refer to Voltage Output Facets properties.
Proxy Ext	additional properties	Refer to Voltage Output Proxy Ext properties.
Out	read-only	Reports the current value of the proxy point and its status.
In2-7 and 9-16	number of volts between 0.00 and 10.0, defaults to 0.0	Configures the number of output volts.
Fallback	number of volts between 0.00 and 10.0, defaults to 0.0	Creates a pre-defined output value in case of a null input.
Override Expiration	Date and time drop-down lists.	Defines when a waiting period is over and an action is automatically issued to a point.

Voltage Output Facets properties

Facets determine how a point’s value displays in the station. Voltage Output facets include voltage numbers and decimal precision.

Figure 439. Voltage Output facets and Edit facetw window

Property	Value	Description
Quantity	drop-down lists, defaults to `electric potential`.	Configures the formula.
Unit	defaults to Volts	Configures the default unit.
max	number, defaults to 0.0	Defines the maximum high speed counter value.
min	number, defaults to 10.0	Defines the minimum high speed counter value.
precision	number, defaults to 1	Defines the number of decimal places allowed.

Voltage Output Proxy Ext properties

Nrio-capable controllers and external I/O modules typically have some number of relay-type digital outputs (DO) and/or 0-to-10Vdc analog output (AO) terminals.

The driver supports two writable points:

RelayOutputWritable, which is a standard BooleanWritable point with an NrioRelayOutputWritable proxy extension.
This point defaults to normal logic, that is, an input value of true closes the contacts. A Conversion type of Reverse Polarity reverses the Boolean state going from input to output, thus opening the contacts.
VoltageOutputWritable, which is a standard NumericWritable point with an NrioVoltageOutputWritable proxy extension.
This point represents a 0-to-10Vdc analog output with additional override properties.

Figure 440. Voltage Output Proxy Ext properties

In addition to the standard properties (Status, Fault Cause, and Enabled), these properties support voltage output proxy extensions.

Property	Value	Description
Conversion	Drop-down list (defaults to `Default`)	Defines how the system converts proxy extension units to parent point units. `Default` automatically converts similar units (such as Fahrenheit to Celsius) within the proxy point. NOTE: In most cases, the standard `Default` conversion is best. `Linear` applies to voltage input, resistive input and voltage output writable points. Works with linear-acting devices. You use the Scale and Offset properties to convert the output value to a unit other than that defined by device facets. `Linear With Unit` is an extension to the existing linear conversion property. This specifies whether the unit conversion should occur on “Device Value” or “Proxy Value”. The new linear with unit convertor, will have a property to indicate whether the unit conversion should take place before or after the scale/offset conversion. `Reverse Polarity` applies only to Boolean input and relay output writable points. Reverses the logic of the hardware binary input or output. `500 Ohm Shunt` applies to voltage input points only. It reads a 4-to-20mA sensor, where the Ui input requires a 500 ohm resistor wired across (shunting) the input terminals. `Tabular Thermistor` applies to only a Thermistor input point and involves a custom resistance-to-temperature value response curve for Type 3 Thermistor temperature sensors. `Thermistor Type 3` applies to an Thermistor Input point, where this selection provides a “built-in” input resistance-to-temperature value response curve for Type 3 Thermistor temperature sensors. `Generic Tabular` applies to non-linear 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.
Tuning Policy Name	drop-down list (defaults to `Default Policy`)	Selects a network tuning policy by name. This policy defines stale time and minimum and maximum update times. During polling, the system uses the tuning policy to evaluate both write requests and the acceptability (freshness) of read requests.
Read Value	read-only	Displays the last value read from the device, expressed in device facets.
Write Value	read-only	Displays the last value written using device facets.
Poll Frequency	drop-down list (defaults to `Normal`)	Selects among three rates (Fast, Normal and Slow) to determine how often to query the component for its value. The network’s Poll Service or Poll Scheduler defines these rates in hours, minutes and seconds. For example: `Fast` may set polling frequency to every second. `Normal` may set poll frequency to every five seconds. `Slow` may set poll frequency to every 30 seconds. This property applies to all proxy points.
Instance	number	Defines the point’s I/O terminal address based on its hardware type. If duplicated (same instance as same hardware type, same board), the point reports a fault status. If an edit attempt is made to an instance already in use by another proxy point, the system discards the edit, and retains the previous instance value.
Ui Type	read-only	Identifies the Nrio Universal Input point type: Resistive Input, Boolean Output, etc.