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Logix5000 Controllers Function Block Diagram Programming Manual

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Logix5000 Controllers Function Block DiagramCatalog Numbers 1756 ControlLogix, 1769 CompactLogix, 1789 SoftLogix, 1794 FlexLogix, PowerFlex 700S with DriveLogixProgramming ManualImportant User InformationSolid state equipment has operational characteristics differing from those of electromechanical equipment. Safety Guidelines for the Application, Installation and Maintenance of Solid State Controls (publication SGI-1.1 available from your local Rockwell Automation sales office or online at http://www.rockwellautomation.com/literature/) describes some important differences between solid state equipment and hard-wired electromechanical devices. Because of this difference, and also because of the wide variety of uses for solid state equipment, all persons responsible for applying this equipment must satisfy themselves that each intended application of this equipment is acceptable.In no event will Rockwell Automation, Inc. be responsible or liable 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.Allen-Bradley, Rockwell Automation, and TechConnect are trademarks of Rockwell Automation, Inc.Trademarks not belonging to Rockwell Automation are property of their respective companies.WARNINGIdentifies information about practices or circumstances that can cause an explosion in a hazardous environment, which may lead to personal injury or death, property damage, or economic loss.IMPORTANTIdentifies information that is critical for successful application and understanding of the product.ATTENTIONIdentifies 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 consequenceSHOCK HAZARDLabels may be on or inside the equipment, for example, a drive or motor, to alert people that dangerous voltage may be present.BURN HAZARDLabels may be on or inside the equipment, for example, a drive or motor, to alert people that surfaces may reach dangerous temperatures.3Publication 1756-PM009C-EN-P - October 20093Table of ContentsTable of ContentsPrefacePurpose of this Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5How to Use this Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Chapter 1Program a Function Block DiagramIntroduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7Choose the Function Block Elements . . . . . . . . . . . . . . . . . . . . . . . . . . 8Choose a Tag Name for an Element. . . . . . . . . . . . . . . . . . . . . . . . . . . . 8Define the Order of Execution. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10Data Latching. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10Order of Execution. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12Resolve a Loop. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13Resolve Data Flow Between Two Blocks. . . . . . . . . . . . . . . . . . . . 15Create a One Scan Delay. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16Identify any Connectors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16Define Program/Operator Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . 17Add a Sheet. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20Add a Function Block Element. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20Create a Text Box. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22Language Switching. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23Connect Elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23Show or Hide a Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23Wire Elements Together. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24Mark a Wire with the Assume Data Available Indicator. . . . . . . . 24Assign a Tag. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25Create and Assign a New Tag. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25Assign an Existing Tag . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26Assign an Immediate Value (Constant). . . . . . . . . . . . . . . . . . . . . . . . . 26Use an IREF. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26Enter a Value in the Tag of a Block . . . . . . . . . . . . . . . . . . . . . . . . 27Connect Blocks with an OCON and ICON . . . . . . . . . . . . . . . . . . . . 27Add an OCON . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27Add an ICON . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28Verify the Routine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 284Publication 1756-PM009C-EN-P - October 2009Table of Contents5Publication 1756-PM009C-EN-P - October 20095PrefacePurpose of this ManualThis manual shows how to program Logix5000 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 Logix5000 controllers. For a complete list of common procedures manuals, see the Logix 5000 Controllers Common Procedures Programming Manual, publication 1756-PM001.The term Logix5000 controller refers to any controller that is based on the Logix5000 operating system, such as:•CompactLogix controllers•ControlLogix controllers•DriveLogix controllers•FlexLogix controllers•SoftLogix5800 controllersHow to Use this ManualSome text is formatted differently from the rest of the text.Text that isIdentifiesFor exampleMeansItalicthe actual name of an item that you see on your screen or in an exampleRight-click User-Defined…Right-click the item that is named User-Defined.courier information that you must supply based on your application (a variable)Right-click name_of_program…You must identify the specific program in your application. Typically, it is a name or variable that you have defined.enclosed in bracketsa keyboard keyPress [Enter].Press the Enter key.

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