Echelon SmartServer 2.2 - Manual (Page 456)

SmartServer 2.2 User’s Guide 457
2. Click a scalar data point with the same data type as the selected input points or select a
SNVT_switch data point in the SmartServer tree to be used as the output point.

If the Analog Functional Block is performing a mathematical operation, you can select a
scalar data point with the same type as the selected input points.

If the Analog Functional Block is performing a logical operation, you must select a
SNVT_switch data point as the output point.
3. The programmatic name of the selected data point appears on the output point icon and the
programmatic name and type of the data point are listed directly below the icon.
4. Click Submit. The Analog Functional Block will perform the specified mathematical or logical
function each time any of the input points are updated and store the result in the specified output
data point.

If the Analog Functional Block is performing a mathematical function, the calculated value is
stored in the selected scalar output point.

If the Analog Functional Block is performing a logical function, and the function returns
TRUE, the SNVT_switch output point is set to 100.0 1. If the function returns FALSE, the
SNVT_switch output point is set to 0.0 0.
5. In the Calculation Interval box on the right side of the application, you can specify the amount of
time (in seconds) that must elapse between updates to the output point. Setting an interval may be
useful to ensure that the output data point is only updated when all the input point updates have
been received. The default value is 0, which means that the Analog Functional Block updates the
output point each time an input point is updated.
6. In the Override Behavior box on the right side of the application, you can specify the behavior of
the output data point when the analog functional block is placed in override mode.

Select Retain Last Value for the output data point to retain the last value assigned to it by the
Analog Functional Block. This is the default.

Select Use Specified Value and then enter a value in the Value box that appears below to be
assigned to the data point.

Select Use Default Value to assign the output data point its default value, as defined for its
type in the resource files. You can change the default value for a data in the Configure -
Data Points Web page, which you can access by clicking the data point in General mode.