Rockwell Automation Logix5000 Controllers Function Block Diagram Programming Manual - Manual (Page 24)

Chapter 1 Program a Function Block Diagram
Wire elements together
Wire (connect) two elements together by clicking the output pin of the first
element and clicking the input pin of the other element. A green dot shows a valid
connection point.
Item Description
Output pin of the first element
Input pin of the second element
Mark a wire with the Assume Data Available indicator
When there are a group of blocks in a loop, identify which block executes first.
The Assume Data Available indicator marks the input wire that creates the loop
(the feedback wire). It defines the data flow within the loop.
• To define a wire as an input wire, right-click the wire and click Assume
Data Available.
The arrow indicates that the data serves as input to the first block in the loop.
24 Rockwell Automation Publication 1756-PM009E-EN-P - October 2014