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LNS Programmer's Guide

184

Set MyNewTag = MyMessageTags.Add(“newName”)

4. For information on using message tags and message monitor points for

monitor and control operations, see Chapter 9, Monitor and Control.

Creating Dynamic Network Variables

You can add network variables to custom interfaces on devices that support dynamic

network variables, to dynamic LonMarkObject objects, or to static LonMarkObject

objects that support dynamic network variable assignment. If you attempt to add a

network variable to a static LonMarkObject or a device’s main interface, then the

LCA#119 lcaErrInterfaceNotModifyable exception will be thrown, unless the

device supports the addition of dynamic network variables to static LonMarkObject

objects. You can determine whether a LonMarkObject is static or dynamic by reading

the object’s IsDynamic property.

You should note that network variables contained within the same custom Interface

objects must have unique user names (Name property). In addition, some devices, such as

the i.LON 100 Internet Server, require that all network variables within the device have

unique programmatic names (ProgammaticName property). If you attempt to assign a

duplicate user name or programmatic name to a network variable on such a device or

interface, the operation will fail, and the LCA#132 lcaErrUniqueNvNameRequired

exception will be thrown.

To add a network variable to a custom interface or to a LonMarkObject, follow these

steps:

1. Access the custom interface you want to add the network variable to. If

necessary, create a new custom interface, as described in Adding a

Custom Interface to a Device on page 181. Or, access the LonMarkObject

you want to add a network variable to.

Dim MyInterfaces as LcaInterfaces

Dim MyNewInt as LcaInterface

Set MyInterfaces = MyAppDevice.Interfaces

Set MyNewInt = MyInterfaces.Item(“newInt”)

2. Access the interface or LonMarkObject object’s NetworkVariables

collection.

Dim myNVs as LcaNetworkVariables

Set myNVs = MyNewInt.NetworkVariables

3. Call Add() to add a new network variable to the collection. For

descriptions of the parameters you need to specify, see the LNS Object

Server Reference help file.

Dim NewNV as LcaNetworkVariable

Set NewNV = myNVs.Add(“nv3”,nvType, nvDirection, _

nvOptions, memberNumber,manufacturerAssigned)

Note that you can also use the MoveToInterface() method to move dynamic network

variables from one interface to another. This may be useful if you want to remove a

dynamic network variable from a device’s main interface. You cannot use the Remove()

method to remove a network variable from NetworkVariables collection on a device's

main interface, even if it is a dynamic network variable. However, you can use the

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