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Logix5000 Controllers Sequential Function Charts Programming Manual

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Logix5000 Controllers Sequential Function ChartsCatalog 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.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, CompactLogix, ControlLogix, DriveLogix, FlexLogix, Logix5000, PowerFlex 700S, Rockwell Software, RSLogix 5000, SoftLogix, 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-PM006D-EN-P - August 20103 Summary of ChangesSummary of ChangesThis manual contains new and updated information. Changes throughout this revision are marked by change bars, as shown to the right of this paragraph.ChangePageDescription of postscan of SFC logic42Publication 1756-PM006D-EN-P - August 20104 Summary of ChangesNotes:5Publication 1756-PM006D-EN-P - August 20105Table of ContentsPrefacePurpose of This Manual. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9How to Use This Manual. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9Chapter 1Design a Sequential Function ChartIntroduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11What is a Sequential Function Chart?. . . . . . . . . . . . . . . . . . . . . . . . . . 12Define the Tasks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15Choose How to Execute the SFC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16Define the Steps of the Process. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16Step Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17SFC_STEP Structure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18Organize the Steps. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21Sequence. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23Selection Branch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23Simultaneous Branch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24Wire to a Previous Step. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25Add Actions for Each Step . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25How Do You Want to Use the Action?. . . . . . . . . . . . . . . . . . . . . 26Use a Non-Boolean Action. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26Use a Boolean Action . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28SFC_ACTION Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29Describe Each Action in Pseudocode. . . . . . . . . . . . . . . . . . . . . . . . . . 30Choose a Qualifier for an Action . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30Define the Transition Conditions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31Transition Tag . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33How Do You Want to Program the Transition?. . . . . . . . . . . . . . 33Use a BOOL Expression. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34Call a Subroutine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34Transition After a Specified Time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35Turn Off a Device at the End of a Step. . . . . . . . . . . . . . . . . . . . . . . . 38Choose a Last Scan Option. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38Use the Don’t Scan Option. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40Use the Programmatic Reset Option . . . . . . . . . . . . . . . . . . . . . . . 41Use the Automatic Reset Option . . . . . . . . . . . . . . . . . . . . . . . . . . 42Keep Something On From Step-to-Step . . . . . . . . . . . . . . . . . . . . . . . 44How Do You Want to Control the Device? . . . . . . . . . . . . . . . . . 44Use a Simultaneous Branch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45Store and Reset an Action. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45Use One Large Step. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47End the SFC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48Use a Stop Element. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48Restart (Reset) the SFC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49SFC_STOP Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50Nest an SFC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51Pass Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52Configure When to Return to the OS/JSR. . . . . . . . . . . . . . . . . . . . . . 52

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文档介绍: Logix5000 Controllers Sequential Function Charts Programming Manual

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