Rockwell Automation Logix 5000 User Manual

Chapter 1 Program a Function Block Diagram
Rockwell Automation Publication 1756-PM009J-EN-P - March 2022 17
This example is OK.
This example is not OK.
The
Assume Data Available
indicator defines the data flow within the loop.
The controller cannot resolve the loop because all the wires use the
Assume Data
Available
indicator.
When using two or more wires to connect two blocks, use the same data flow
indicators for all of the wires between the two blocks.
This is OK
This is NOT OK
In this example, neither wire uses the Assume Data Available indicator.
In this example, both wires use the
Assume Data Available
indicator.
In this example, only one wire uses the Assume Data Available indicator.
Use the Assume Data Available indicator to produce a one scan delay between
blocks. In this example, block 1 executes first. It uses the output from block 2
that was produced in the previous scan of the routine.
Resolve data flow between
two blocks
Create a one scan delay

Rockwell Automation Logix 5000 Specifications

General

Brand	Rockwell Automation
Model	Logix 5000
Category	Controller
Language	English