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Snmp Agent Numeric Proxy Ext

Snmp Agent Numeric Proxy Ext contains information necessary to hold a float (or integer) data value which can be set by an outside Snmp manager.
Figure 18.   Snmp Agent Numeric Proxy Ext Properties
Image

To access this view, expand Config > Drivers > SnmpNetwork > Agents, double-click SnmpAgentNumericPoint.

In addition to the standard properties (Status, Enabled and Fault Cause), these properties are unique to this component.

Property Value Description
Facets read-only Determine how values are formatted for display depending on the context and the type of data. For example, instead of the Boolean facets trueText and falseText you may want to display ON and OFF, Access Granted and Access Denied or Locked and Unlocked.

You access facets by clicking an Edit button or a chevron >>. Both open an Edit Facets window.

Device Facets additional properties Configures additional parameters for the device proxy point facets for how the value should be displayed in Niagara. Please confirm.
Conversion drop-down list 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 Configures network rules for evaluating both write requests to writable proxy points as well as the acceptable 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.
Object Identifier read-only Displays the full OID to use for accessing the data value for this point from the Input Table (or Output Table) by an outside Snmp manager. Snmp GET or SET requests would use this full OID to access the value of the proxy point.
Index number Need Information
Out read-only Represents the point slot that contains the value to output.
Default Value number Need Information

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