Echelon LonPoint Application and Plug-In - Manual (Page 76)

8-4 Analog Function Block Functional Block
Inputs
This tab appears as follows:
This tab determines what values are used for the analog operands. For each of
the two operands, you can use the associated network variable by selecting Use
Network Variable
, or use a constant by selecting Use Constant and setting
the corresponding field to the desired constant value. The constant type depends
on the input network variable type specified on the Analog Function Block tab.
Select the Square Root option to have the square root of the associated value
be passed to the calculation. You can use the Square Root option only if you
choose the Use Network Variable option and you select a math function.
None of the values or options on this tab can be changed if the Enthalpy mode
is selected on the Function tab.
The Absolute and Differential options apply to the constant values and are
only enabled if the corresponding analog input network variable is using the
SNVT_temp_f
network variable type with the Fahrenheit format
(SNVT_temp#US). If Absolute is set, the network variable or constant input will
be interpreted as a point on the temperature scale (i.e. 32 degrees Fahrenheit
would be interpreted as 0 degrees Celsius). If Differential is set, the network
variable or constant will be treated as a difference between two temperatures
(i.e. 0 degrees Fahrenheit would be interpreted as 0 degrees Celsius). If the