Voltage Output points

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

Figure 420. Voltage Output tab

You access it from the Nrio Point Manager, Analog Points tab by clicking the hyperlink on a Voltage Output 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 421. 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.
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 422. 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. `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. `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.
Tuning Policy Name	drop-down list, defaults to `Default Policy`.	Identifies the assigned tuning policy. During polling, the system uses such collections of rules to evaluate both write requests and the acceptability (freshness) of read requests.
Read Value	read-only	Reports the last value read using device facets.
Write Value	read-only	Reports the last value written using device facets. Applies only to writable points.
Poll Frequency	drop-down list, defaults to `Normal`	`Fast` sets polling frequency to every second. `Normal` sets poll frequency to every five seconds. `Slow` sets poll frequency to every 30 seconds.
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.

Voltage Output Out properties

Each of the 16 output points can be configured separately.

Property	Value	Description
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.