Echelon LNS Manual de usuario descargar pdf (Pagina 210)

LNS Programmer's Guide

196

3. Get the network variable(s) you will be monitoring:

Set MyInterface = MyAppDevice.Interface

Set MyNVs = MyInterface.NetworkVariables

Set MyNV = MyNVs.Item(“nvoTemperature”)

Set MyNV2 = MyNVs.Item(“nvoAlarm”)

4. Repeat steps 2 and 3 until you have acquired all the network variables

you want to monitor, and get the monitor set that will contain the

monitor points for these network variables. You should have first created

a monitor set for this purpose, as described in the Creating Monitor Sets

section. Remember that when adding network variable monitor points to

a permanent monitor set, or when making any persistent changes to a

permanent monitor set’s configuration, you should access the monitor set

through the MyVni property.

Set MonVNI = MyNetwork.MyVNI

Set MySets = MonVNI.MonitorSets

Set MySet = MySets.Item(“Monitor Set 1”)

5. Access the monitor set’s NvMonitorPoints collection, and use the Add()

method to add network variable monitor points to the monitor set. Each

time you call Add(), you will pass in the network variable to be

monitored by the new point as the nv_target element.

Echelon recommends that you use transactions when creating permanent

network variable monitor points, as this considerably reduces the time

required to create the monitor points. Transactions should not generally

be used when creating temporary monitor points since they are not stored

in the LNS database, and so starting a transaction would unnecessarily

slow down the process. For more information on using transactions with

LNS, see Using Transactions and Sessions on page 65.

MySystem.StartTransaction()

Dim NvMp1 as LcaNvMonitorPoint

Dim NvMp2 as LcaNvMonitorPoint

Set NvMonitorPoints = MySet.NvMonitorPoints

Set NvMp1 =NvMonitorPoints.Add("nvMP1", MyNV, nothing)

Set NvMp2 =NvMonitorPoints.Add("nvMP2", MyNV2, nothing)

6. Set the properties of the new NvMonitorPoint object. Two properties

you should initially set are the Tag property and the DefaultOptions

properties. You can use the DefaultOptions property to set the default

monitoring options that will be applied to the new monitor point each

time it is enabled. See the LNS Object Server Reference help file for more

information on the Tag property, and for a complete list of the properties

of the NvMonitorPoint object. For more information on monitoring

options, see Setting Monitoring Options on page 200.

For permanent monitor points, you should perform these tasks in the

same transaction that the monitor points were created in. When you have

finished, commit the transaction to the database.

MySystem.CommitTransaction()

7. You can now enable the monitor point for monitor and control operations.

For more information on this, see Opening and Enabling Monitor Sets on

page 213.

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