Resistive Input points

This is a NumericPoint that reads a resistive signal within a 0-to-100K ohm range and produces either an ohms value or a linear, scaled output value.

Figure 408. Resistive Input tab

You access this view from the main menu by clicking Controller Setup > Remote Devices > Remote Drivers, followed by double-clicking the NrioNetwork driver, selecting and double-clicking a module, clicking the Point Manager link, followed by clicking the hyperlink to the right end of the Restive Input point.

Resistive Input Facets

Facets determine how a point’s value displays in the station. Resistive input facets include a minimum, maximum, and decimal precision.

Figure 409. Resistive Input Facets and Edit facets window

The Edit window opens when you click the Edit button.

Property	Value	Description
Quantity	drop-down list	Defines the formula.
Unit	defaults to ohm	Configures the default unit.
Max	number, defaults to Infinity	Defines the maximum ohm value.
Min	number, defaults to negative Infinity	Defines the minimum ohm value.
Precision	number, defaults to one	Defines the number of decimal places allowed.

Resistive Input Proxy Ext properties

These properties configure the proxy point extension.

Figure 410. Resistive Input Proxy Ext properties

In addition to the standard properties (Status, Fault Cause, and Enabled), these properties support resistive input 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.
Ui Type	read-only	Identifies the Nrio Universal Input point type: Resistive Input, Boolean Output, etc.

Resistive Input, Linear Calibration Ext properties

These properties configure the linear calculation that yields the Out value.

Figure 411. Resistive Input Linear Calibration properties

Property	Value	Description
Scale	number, defaults to 1.0	Part of a formula for converting temperature. This also involves changing value facets.
Offset	positive or negative number, defaults to 0.0	Works with `Scale` to convert temperature.
Units, Quantity	drop-down list
Units	drop-down list	Should be the same as the parent proxy point’s facets.
Fault Cause	read-only	Reports the reason why a network, component, or extension is in fault. Fault Cause is blank unless a fault exists.