Echelon LonMaker - Manual (Page 199)

LonMaker User’s Guide 183
select an input network variable with a SNVT_switch type as the
data point, the switch is off, and you select (the default) from
the field name list, the Data Point shape displays the entire
structure, which would be “0.0 0”. If you select value, the value
displayed in the Data Point shape will be “0.0”, and if you select
state, the value displayed will be “0”.
This option is unavailable if the network variable or configuration
property type does not have a structure, or the selected data point is
a functional block state.
Polling Interval Specifies how frequently (in seconds) the data point is polled. The
default is 5 seconds for polled network variables and 15 seconds for
monitored configuration properties and functional block states.
If you change the polling interval, the value you enter becomes the
default for new Data Point shapes of that object type until you close
the drawing and then re-open it from the LonMaker Design
Manager. For example, if you change the polling interval for a
network variable to 8 seconds, all new network variable data points
that you create will be polled every 8 seconds. The default
monitoring rate for functional block states and configuration
properties, though, would not be affected.
Report Value
Changes Only Select whether a network variable Data Point shape is updated
anytime a poll (or update) occurs, or is only updated when the
network variable value has changed. This check box is cleared by
default, which means that the network variable Data Point shape is
updated anytime the network variable is polled (or updated).
This option is only available if the selected data point is a network
variable.
Use Bound
Connection Selects whether the LNS server monitors a network variable data
point by creating a connection from the LNS Network Service
Device (NSD) to the network variable, or by polling. This check
box is cleared by default, which means the LNS server uses polling.
This option is only available if the selected data point is an output
network variable. If an input network variable is selected, the LNS
server automatically uses polling.
5. Click OK. The Data Point shape is added to your LonMaker drawing. The data point value
appears in the Data Point shape if monitoring is enabled in the LonMaker drawing and in the Data
Point shape.
6. If no data point value appears in the Data Point shape, verify that monitoring is enabled in both the
network and in the Data Point shape. Right-click the Data Point shape and select Monitor Value
on the shortcut menu if it is not already selected. If the data point value appears in brackets,
right-click a clear space in the drawing page and select Enable Monitoring on the shortcut menu.
Updating a Data Point
You can update the value of a Data Point shape that represents an input network variable,
configuration property, or functional block state. A Data Point shape may represent a scalar value, a
structured value, or an enumerated value.