User`s guide

Control Strategy Configuration
How to Configure Function Block Parameters
Release E UMC800 Control Builder User’s Guide 97
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Function block inputs
• All Function Block Inputs must be connected to a
signal source.
• The inputs may be connected to the output of
another function block, to a variable, or a
constant.
Variables are named values that can be
connected to function block inputs and can be
changed from the operator interface.
Variable is a type of drawing item. The variable
holds one value. The value is entered from the
operator interface or a recipe during operation.
The Control Builder cannot set it.
Constants are unnamed objects, external to any
function block that may hold a single value. The
Control Builder sets the value and the operator
interface cannot alter the value.
Constants provide a means to drive unused or
invariant function block inputs.
Inputs
ATTENTION: Variables and constants do not
consume a function block number.
Function block outputs
• Function Block Outputs are signals that reflect the
results of a function block’s execution.
• A function block may have 0, 1, or more outputs.
• An unused output need not be connected.
• An output can be connected to any number of
function block inputs including inputs on the same
block.
• An output may NOT be connected to another
output, a named variable, or a constant.
Outputs
Function block parameters
• All Function Block Parameters are values that
influence the function block’s execution.
• Click the cursor on the desired parameter to
highlight it.
• Key in the desired value, use the scroll buttons at
the edge of the box or make a selection from the
drop down menu.
• Press F1 for help on any active field.
• Press OK when configuration is complete to close
the box and save the entries.