Rockwell Automation Allen-Bradley Logix 5000 Series User manual

Rockwell Automation Publication 1756-PM009J-EN-P - March 2022
Supercedes Publication 1756-PM009I-EN-P - September 2020
Programming Manual
Original Instructions
Logix 5000 Controllers
Function Block Diagram
1756 ControlLogix, 1756 GuardLogix, 1769 CompactLogix,
1769 Compact GuardLogix, 1789 SoftLogix, 5069
CompactLogix, 5069 Compact GuardLogix, Studio 5000
Logix Emulate

Logix 5000 Controllers Function Block Diagram
2 Rockwell Automation Publication 1756-PM009J-EN-P - March 2022
Important User Information
Read this document and the documents listed in the additional resources section about installation, configuration, and
operation of this equipment before you install, configure, operate, or maintain this product. Users are required to familiarize
themselves with installation and wiring instructions in addition to requirements of all applicable codes, laws,and standards.
Activities including installation, adjustments, putting into service, use, assembly, disassembly, and maintenance are required to
be carried out by suitably trained personnel in accordance with applicable code of practice.
If this equipment is used in a manner not specified by the manufacturer, the protection provided by the equipment may be
impaired.
In no event will Rockwell Automation, Inc. be responsible orliable for indirect or consequential damages resulting from the use
or application of this equipment.
The examples and diagrams in this manual are included solely for illustrative purposes. Because of the many variables and
requirements associated with any particular installation, Rockwell Automation, Inc. cannot assume responsibility or liability for
actual use based on the examples and diagrams.
No patent liability is assumed by Rockwell Automation, Inc.with respect to use of information, circuits, equipment, or software
described in this manual.
Reproduction of the contents of this manual, in whole or in part, without written permission of Rockwell Automation, Inc., is
prohibited.
Throughout this manual, when necessary, we use notes to make you aware of safety considerations.
WARNING: Identifies information about practices or circumstances that can cause an explosion in a hazardous environment, whichmay lead to personal injury
or death, property damage, or economic loss.
ATTENTION: Identifies information about practices or circumstances that can lead to personal injury or death, property damage, or economic loss. Attentions
help you identify a hazard, avoid a hazard, and recognize the consequence.
IMPORTANT
Identifies information that is critical for successful application and understanding of the product.
Labels may also be on or inside the equipment to provide specific precautions.
SHOCK HAZARD: Labels may be on or inside the equipment, for example, a drive or motor, to alert people that dangerous voltage may be present.
BURN HAZARD: Labels may be on or inside the equipment, for example, a drive or motor, to alert people that surfaces may reach dangerous temperatures.
ARC FLASH HAZARD: Labels may be on or inside the equipment, for example, a motor control center, to alert people to potential Arc Flash. Arc Flash will cause
severe injury or death. Wear proper Personal Protective Equipment (PPE). Follow ALL Regulatory requirements for safe work practices and for Personal
Protective Equipment (PPE).
Rockwell Automation recognizes that some of the terms that are currently used in our industry and in this publication are not in
alignment with the movement toward inclusive language in technology. We are proactively collaborating with industry peers to
find alternatives to such termsand making changes to our products and content. Please excuse the use of such terms in our
content while we implement these changes.

Rockwell Automation Publication 1756-PM009J-EN-P - March 2022 3
Summary of changes
This manual includes new and updated information. Use these reference
tables to locate changed information.
Grammatical and editorial style changes are not included in this summary.
Global changes
None in this release.
New or enhanced features
This table contains a list of topics changed in this version, the reason for the
change, and a link to the topic that contains the changed information.
Change
Topic
Updated Legal notices.
Legal notices on page 8

Rockwell Automation Publication 1756-PM009J-EN-P - March 2022 5
Table of Contents
Studio 5000 environment ...........................................................................7
Additional resources....................................................................................8
Legal notices.................................................................................................8
Chapter 1
Introduction................................................................................................11
Choose the function block elements ........................................................ 12
Choose a tag name for an element ........................................................... 12
Define the order of execution....................................................................13
Data latching ........................................................................................13
Order of execution ...............................................................................15
Resolve a loop .......................................................................................16
Resolve data flow between two blocks................................................17
Create a one scan delay........................................................................17
Summary...............................................................................................18
Identify any connectors.............................................................................18
Define program/operator control.............................................................18
Add a sheet..................................................................................................21
Add a function block element....................................................................21
Use functions....................................................................................... 22
Create a text box.........................................................................................23
Language switching ............................................................................ 24
Connect elements...................................................................................... 25
Show or hide a pin............................................................................... 25
Wire elements together ...................................................................... 25
Mark a wire with the Assume Data Available indicator ................... 25
Assign a tag ................................................................................................ 26
Create and assign a new tag............................................................... 26
Assign an existing tag......................................................................... 27
Assign an immediate value (constant)..................................................... 28
Use an IREF ......................................................................................... 28
Enter a value in the tag of a block ...................................................... 28
Connect blocks with an OCON and ICON .............................................. 28
Add an OCON...................................................................................... 29
Add an ICON ....................................................................................... 29
Rename a wire connector................................................................... 29
Rename a connector group ................................................................ 29
Verify the routine ...................................................................................... 30
Summary of changes
Preface
Program a Function Block
Diagram
Index

Rockwell Automation Publication 1756-PM009J-EN-P - March 2022 7
Preface
This manual shows how to program Logix 5000 controllers with the function
block diagram (FBD) programming language. This manual is one of a set of
related manuals that show common procedures for programming and
operating Logix 5000 controllers.
For a complete list of common procedures manuals, refer to the Logix 5000
Controllers Common Procedures Programming Manual, publication
1756-PM001.
The term Logix 5000 controller refers to any controller based on the Logix
5000 operating system.
Rockwell Automation recognizes that some of the terms that are currently
used in our industry and in this publication are not in alignment with the
movement toward inclusive language in technology. We are proactively
collaborating with industry peers to find alternatives to such terms and
making changes to our products and content. Please excuse the use of such
terms in our content while we implement these changes.
The Studio 5000 Automation Engineering & Design Environment® combines
engineering and design elements into a common environment. The first
element is the Studio 5000 Logix Designer® application. The Logix Designer
application is the rebranding of RSLogix 5000® software and will continue to
be the product to program Logix 5000™ controllers for discrete, process,
batch, motion, safety, and drive-based solutions.
The Studio 5000® environment is the foundation for the future of
Rockwell Automation® engineering design tools and capabilities. The Studio
5000 environment isthe one place for design engineers to develop all
elements of their control system.
Studio 5000 environment

Preface
8 Rockwell Automation Publication 1756-PM009J-EN-P - March 2022
These documents contain additional information concerning related
Rockwell Automation products.
Resource
Description
Industrial Automation Wiring and Grounding Guidelines,
publication 1770-4.1
Provides general guidelines for installing a Rockwell
Automation industrial system.
Product Certifications webpage, available at
http://ab.rockwellautomation.com
Provides declarations of conformity, certificates, and
other certification details.
View or download publications at
http://www.rockwellautomation.com/literature. To order paper copies of
technical documentation, contact the local Rockwell Automation distributor
or sales representative.
Rockwell Automation publishes legal notices, such as privacy policies, license
agreements, trademark disclosures, and other terms and conditions on the
Legal Notices page of the Rockwell Automation website.
End User License Agreement (EULA)
You can view the Rockwell Automation End User License Agreement (EULA)
by opening the license.rtf file located in your product's install folder on your
hard drive.
The default location of this file is:
C:\Program Files (x86)\Common Files\Rockwell\license.rtf.
Open Source Software Licenses
The software included in this product contains copyrighted software that is
licensed under one or more open source licenses.
You can view a full list of all open source software used in this product and
their corresponding licenses by opening the oss_license.txt file located in your
product's OPENSOURCE folder on your hard drive. This file is divided into
these sections:
•Components
Includes the name of the open source component, its version number,
and the type of license.
•Copyright Text
Includes the name of the open source component, its version number,
and the copyright declaration.
•Licenses
Includes the name of the license, the list of open source components
citing the license, and the terms of the license.
The default location of this file is:
Additional resources
Legal notices

Preface
Rockwell Automation Publication 1756-PM009J-EN-P - March 2022 9
C:\Program Files (x86)\Common Files\Rockwell\Help\<product
name>\Release Notes\OPENSOURCE\oss_licenses.txt.
You may obtain Corresponding Source code for open source packages
included in this product from their respective project web site(s).
Alternatively, you may obtain complete Corresponding Source code by
contacting Rockwell Automation via the Contact form on the Rockwell
Automation website:
http://www.rockwellautomation.com/global/about-us/contact/contact.page.
Please include "Open Source" as part of the request text.