FOUNDATION Fieldbus Design Considerations Reference Manual
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Reference Manual PlantPAx Process Automation System: FOUNDATION Fieldbus Design Considerations Catalog Numbers 1757-FFLDx, 1757-FFLDCx Important User Information Solid-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. WARNING: Identifies 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. 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 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. IMPORTANT Identifies information that is critical for successful application and understanding of the product. Allen-Bradley, Rockwell Software, Rockwell Automation, RSLogix 5000, RSNetWorx, FactoryTalk View SE, FactoryTalk AssetCentre, PlantPAx Process Automation System, RSFieldbus, FactoryTalk View, FactoryTalk View Studio, Logix5000, Integrated Architecture, Encompass, RSNetWorx for ControlNet, Logix5000, RSLinx, RSLinx Classic, and TechConnect are trademarks of Rockwell Automation, Inc. Trademarks not belonging to Rockwell Automation are property of their respective companies. Table of Contents Preface Introduction. 7 What is a Foundation Fieldbus Network? . 7 Required Equipment. 8 Additional Resources . 12 Chapter 1 Plan Your Network Introduction. 13 Architecture Fieldbus Network Topologies . 13 Partition a Network . 18 Signal Considerations . 19 Cable Attenuation. 19 Signal Distortion versus Capacitance. 20 Power and Grounding Considerations . 21 Power Supplies . 21 Power Conditioning . 22 Signal Wire Polarity . 22 Grounding. 23 EtherNet/IP Considerations . 24 Establishing Connections . 25 Assigning IP Addresses and Subnet Masks . 26 Using a Managed Switch . 27 ControlNet Considerations. 28 Scheduling Data Communication. 29 Using RSNetWorx Software and ControlNet Setup Tool. 29 Redundancy Considerations . 30 Redundant Power Supplies and H1 Segments. 31 Chapter 2 Basic Usage of Function Blocks Introduction. 33 Basic Function Blocks . 34 Function Block Parameters . 36 Parameter Status . 37 MODE Block Parameter. 38 Mode Types. 38 Function Block Set Up . 40 Resource Block . 40 Transducer Block. 43 Analog Input (AI) Block . 44 Analog Output (AO) Block . 45 Discrete Input (DI) Block. 45 Discrete Output (DO) Block . 46 PID Control Block . 46 Distributed Function Blocks . 47 Differences Between Configuration and Calibration . 48 Calibration Parameters in the Transducer Block . 48 Rockwell Automation Publication RSFBUS-RM001A-EN-P - June 2011 3 Table of Contents Virtual Communication Relationships (VCRs) . 49 VCR Classes . 49 BNU Class . 50 QUU and QUB VCR Classes . 52 Chapter 3 Plan and Configure a Fieldbus Introduction . 53 System Layout Sizing. 53 Network Basics. 54 Create an Application. 57 Create a New RSFieldbus Project . 57 Change Device Class to Back-up LAS . 65 Initialize Communication and Associate the Linking Device . 66 Assign Tags . 69 Add Function Blocks. 70 Create a Fieldbus Control Strategy . 72 Link Blocks . 74 Download the Configuration . 76 Initiate a ControlLogix Control Strategy . 78 Add the Bridge Module . 83 Add the Linking Device . 85 Edit the PID Regulatory Routine. 88 Determining Bad Quality or Loss of Input . 96 Test the PID Loop. 99 Set Up FactoryTalk View Software . 99 Add Device to the FFLDC ControlNet Setup Tool . 100 Naming Conventions . 102 Device Addressing . 103 PID Guide . 104 Simple PID. 104 Cascade PID . 106 Feed Forward PID . 108 Chapter 4 Visualize Fieldbus Instrument Introduction . 111 Data Add-On Instruction Set Up . 113 Configuring RSLogix 5000 with an Add-On Instruction. 113 Data Types and Add-On Instructions . 115 Programs and Routines. ..