Echelon LonPoint Application and Plug-In - Manual (Page 78)

8-6 Analog Function Block Functional Block
Function
This tab appears as follows:
Function Type Determines whether the analog function block
performs a Logic, Math, or Enthalpy function.
The Logic Function options determine what operation will be used if the
function type is set to Logic. The following options are available:
High Select The higher of the two analog operands will be sent to
the analog output.
Low Select The lower of the two analog operands will be sent to
the analog output.
Relay The digital input will select which of the two analog
operands is sent to the analog output. If the digital
input is Off, the Operand 1 value is sent to Analog
Output
. If the digital input is On, the Operand 2
value is sent to Analog Output.
Greater Than The Digital_Out network variable will be set to On
if the value from Operand 1 is greater than the value
from Operand 2. Otherwise, an Off value will be
sent. Changes to the output value are affected by the
Hysteresis
value (see below).