Rockwell Automation Logix5000 Controllers Function Block Diagram Programming Manual - Manual (Page 10)

Chapter 1 Program a Function Block Diagram
To control a device, use these elements.
To choose the function block elements, use these guidelines.
If you want to: Then use this element:
Supply a value from an input device or tag Input reference (IREF)
Send a value to an output device or tag Output reference (OREF)
Perform an operation on an input value or values and produce an output value or
values Function block
Transfer data between function blocks when they are:
•
Far apart on the same sheet.
• On different sheets within the same routine.
Output wire connector (OCON) and an input wire connector (ICON)
Disperse data to several points in the routine Single output wire connector (OCON) and multiple input wire connectors (ICON)
Each function block uses a tag to store configuration and status information about
the instruction.
• When you add function block instruction, the Logix Designer application
automatically creates a tag for the block. Use this tag, rename the tag, or
assign a different tag.
• For IREFs and OREFs, create a tag or assign an existing tag.
For a: Specify:
Tag tag_name
Bit number of a larger data type tag_name.bit_number
Member of a structure tag_name.member_name
Element of a one dimension array tag_name[x]
Choose the function block
elements
Choose a tag name for an
element
10 Rockwell Automation Publication 1756-PM009E-EN-P - October 2014