Manuals / Brands / Computer Equipment / Network Router / National Instruments / Computer Equipment / Network Router

National Instruments BridgeVIEW - page 271

1 455

Download 455 pages, 4.26 Mb

Chapter 12 Case and Sequence Structures and the Formula Node

BridgeVIEW User Manual 12-8 © National Instruments Corporation

Contents

Main Page Important Information Warranty Copyright Trademarks WARNING REGARDING MEDICAL AND CLINICAL USE OF NATIONAL INSTRUMENTS PRODUCTS Contents About This Manual PART I BridgeVIEW Concepts Chapter 1 Introduction Chapter 2 BridgeVIEW Environment Chapter 3 Tag Configuration Page Chapter 4 Human Machine Interface Chapter 5 Alarms and Events Chapter 6 Historical Data Logging and Extraction Chapter 7 Advanced Application Topics Chapter 8 Servers Page Page Page Page Tables Activities About This Manual Organization of This Manual BridgeVIEW Concepts G Tutorial Appendices, Glossary, and Index Conventions Used in This Manual Related Documentation Customer Communication Part I BridgeVIEW Concepts Page Introduction Welcome to BridgeVIEW Required System Configuration Installation What Is BridgeVIEW? How Does BridgeVIEW Work? G Programming Tag Configuration Data Type General Connection Scaling Operations Alarms Events Historical Data Logging and Extraction Security What Is the BridgeVIEW System Architecture? User HMI Application BridgeVIEW Engine Device Servers Where Should I Start? Page BridgeVIEW Environment What Is G? How Does G Work? Virtual Instruments Icon/Connector Tools Palette Controls Palette Functions Palette Controls and Indicators Numeric Boolean String Tag Activity 2-1. Open and Run a VI Page End of Activity 2-1. BridgeVIEW Environment Project Menu Page What Is the BridgeVIEW Engine Manager? Page Page What Are System Errors and Events? What Is the Tag Browser? Page What Is the Tag Monitor? Page Page Page Page How Do You Access Online Help? Simple/Complex Help View Links to Online Help Files Tag Configuration What Is a Tag? Tag Attributes General Attributes Connection Attributes Operation Attributes Scaling Attributes Alarm Attributes What Is the Tag Configuration Editor? Page How Do You Create a Tag? How Do You Edit a Tag? How Do You Delete a Tag? What are Network Tags? How Do You Add Network Tags? How Do You Set Default Values for Tag Configuration Fields? How Do You Use Spreadsheet Files for Tag Configuration? Page How Do You Configure Tags? Data Type Analog Tags Discrete Tags Bit Array Tags String Tags General Connection Page I/O Group Configuration I/O Group Configuration Options Server Configuration Options Communication Resource Configuration Options Device Configuration Options Configuring Device Names Device Configuration Options Configuring Device Resources Item Configuration Item Configuration OptionsConfiguring Item Names Item Configuration Options Configuring Item Resources What Is a Memory Tag? When Should You Use a Memory Tag? Example 1When Not to Use a Memory Tag Example 2When to Use a Memory Tag How Do You Automatically Generate Tags from Server Information? How Do You Connect a Tag to an OPC Server? How Do You Connect a Tag to a DDE Server? How Do You Define a Group of Tags for Alarming? Operations Page What Is Deadband? How Do You Use Deadband to IncreaseEngineThroughput? How Do You Configure a Tag to Log Its Data or Events? How Do You Set Initial Tag Value at Startup? Scaling Page Analog Tags ExampleLinear Scaling ExampleSquare Root Scaling How Do You Assign Units to an Analog Tag? Discrete Tags Bit Array Tags Page Alarms Page Page How Do You Configure Alarms for a Tag? Analog Tags Discrete Tags Bit Array Tags String Tags What Is Alarm Deadband on Analog Tags? How Do You Keep an Alarm Unacknowledged after the Alarm Returns to Normal? Auto Ack on Normal User Must Ack Activity 3-1. Configure a Tag, and View the Tag Configuration Parameters and Tag Values Page Page Page Page End of Activity 3-1. How Do You Configure Other Engine Parameters? How Do You Turn on Historical and Event Logging at Startup? How Do You Set the File Paths for Historical and Events Files? How Do You Configure Shifts? How Do You Configure Engine Parameters? Page How Do You Launch Server Configuration Utilities from the Tag Configuration Editor? How Do You Access or Change Tag Configuration Information in Your Application? Human Machine Interface What Is an HMI? How Do You Build an HMI? Front Panel Objects HMI G Wizard Page Page Page Page Generate the Block Diagram Front Panel Object and Wizard Subdiagram Association Activity 4-1. Use the HMI G Wizard Page Page End of Activity 4-1. How Do You Customize Front Panel Objects? Control Editor Importing Graphics Activity 4-2. Import a Graphic Image into BridgeVIEW Page End of Activity 4-2. How Do You Configure Front Panel Objects Programmatically? How Do You Monitor and Control Tags? Tag Data Type Page Page Tags VIs and Alarms and Events VIs Activity 4-3. Read a Tag Page Page End of Activity 4-3. How Do the Tags, and Alarms and Events VIs Affect Startup/Shutdown? General Principles of G HMI Programming How Do You Implement Event-Driven Programming in G? Page How Do You Implement Polled Programming in G? How Do You Initialize and Shut Down Multiple-Loop Applications? How Do You Display Real-Time Trends? Page How Can You Use Tag Attributes to Configure HMI Indicator Attributes Programmatically? Page Page Alarms and Events What are Alarms and Events? Alarm States Alarm Limit Alarm Priority How Do You Display Alarm Summary Information? Activity 5-1. Build an Alarm Summary Display Page End of Activity 5-1. How Do You Display Event History Information? How Do You Acknowledge Alarms? Activity 5-2. Acknowledge Alarms in the Alarm Summary Display Page End of Activity 5-2. How Do You Configure Logging and Printing of Alarms and Events? Page How Do You Log Alarms and Events? How Do You Print Alarms and Events? How Do You View Alarms and Events? Historical Data Logging and Extraction What Is a Trend? Real-Time Trend Historical Trend What Is Citadel? How Do You Log Historical Data? How Do You Configure Historical Logging? How Do You Extract and View Data from Historical Log Files? Historical Data VIs Page Activity 6-1. Use the Historical Data VIs Page Page End of Activity 6-1. How Do You Select the Tags to Display? How Do You Change the Time Axis? Panning Buttons Manual Changes How Do You Change the Timespan of Data Displayed? How Do You View the Value of a Tag at a Specific Point in Time? How Do You Change the Y Axis? Page How Do You View New Data Automatically After It Has Been Logged to Citadel? How Do You Incorporate the HTV into Your HMI Application? Activity 6-2. Use the Historical Trend Viewer Page Page Advanced Application Topics How Do You Build an HMI with Multiple Panels? Front Panel Buttons Panel G Wizard How Do You Use the Panel G Wizard? How Do You Configure Security with the Panel G Wizard? How Do You Configure When a Button Will Be Polled? Activity 7-1. Use the Panel G Wizard Page End of Activity 7-1. VI Server Functions How Do You Control Panel Size? How Do You Control Panel Visibility? BridgeVIEW System Control System VIs Page Tag Attributes VIs Activity 7-2. Use Tag Attributes Page End of Activity 7-2. BridgeVIEW Security Environment Security Page Page Page Page Page How Do You Modify the List of Available User Access Levels? How Do You Export a List of Users to a File? How Do You Export Users to Another Computer on the Network? How Do You Import a List of Users from a File? How Do You Import Users from Another Computer on the Network? How Do You Modify a Users BridgeVIEW Environment Privileges? Operator Interface Security How Do You Limit User Access to HMI Objects? Activity 7-3. Apply Security to the Alarm Summary Display Page Page End of Activity 7-3. Servers What Are BridgeVIEW Device Servers? How Do You Install and Configure a Device Server? Installing and Configuring the NI-DAQ OPC Server Installing and Configuring Device Servers from the BridgeVIEW Device Servers CD Registering Simulation Servers How Do You Use OPC Servers with BridgeVIEW? Page Using Remote OPC Servers Page How Do You Use DDE Servers with BridgeVIEW? How Do You View BridgeVIEW Server Configuration? Page Registered Server Device and Item Parameters How Do You Develop an IA Device Server? Part II G Tutorial Creating VIs What is a Virtual Instrument? How Do You Build a VI? VI Hierarchy Controls, Constants, and Indicators Ter mi nal s Wires Tip Strips Wire Stretching Selecting and Deleting Wires Bad Wires Activity 9-1. Create a VI Page End of Activity 9-1. VI Documentation Activity 9-2. Document a VI Page End of Activity 9-2. What is a SubVI? Hierarchy Window Page Search Hierarchy Icon and Connector Page Activity 9-3. Create an Icon and Connector Page End of Activity 9-3. Opening, Operating, and Changing SubVIs Activity 9-4. Call a SubVI End of Activity 9-4. How Do You Debug a VI? Activity 9-5. Debug a VI in BridgeVIEW End of Activity 9-5. Customizing VIs Set Window Options SubVI Node Setup Activity 10-1.Use Setup Options for a SubVI Page Page Page Front Panel Block Diagram End of Activity 10-1. Loops and Charts What is a Structure? Charts Chart Modes Faster Chart Updates Overlaid Versus Stacked Plots Activity 11-1. Experiment with Chart Modes End of Activity 11-1. While Loops Activity 11-2. Use a While Loop and a Chart Page Page End of Activity 11-2. Mechanical Action of Boolean Switches Activity 11-3. Change the Mechanical Action of a Boolean Switch End of Activity 11-3. Timing Activity 11-4. Control Loop Timing End of Activity 11-4. Preventing Code Execution in the First Iteration Shift Registers Page Activity 11-5. Use a Shift Register Page End of Activity 11-5. Using Uninitialized Shift Registers Page Activity 11-6. Create a Multiplot Chart and Customize Your Trends Page Page End of Activity 11-6. For Loops Numeric Conversion Activity 11-7. Use a For Loop Page End of Activity 11-7. Case and Sequence Structures and the Formula Node Case Structure Activity 12-1. Use the Case Structure Page VI Logic End of Activity 12-1. Sequence Structures Activity 12-2. Use a Sequence Structure Modifying the Numeric Format Setting the Data Range Page Page End of Activity 12-2. Formula Node Page Activity 12-3. Use the Formula Node Page End of Activity 12-3. Artificial Data Dependency Front Panel Object Attributes Page Activity 13-1. Use an Attribute Node End of Activity 13-1. Arrays, Clusters, and Graphs Arrays How Do You Create and Initialize Arrays? Array Controls, Constants, and Indicators Auto-Indexing Activity 14-1. Create an Array with Auto-Indexing Page Page Multiplot Graphs End of Activity 14-1. Activity 14-2. Use Auto-Indexing on Input Arrays Using Auto-Indexing to Set the For Loop Count End of Activity 14-2. Build Array Using Array Functions Initialize Array Array Size Array Subset You can use this function to extract a portion of an array or matrix. Index Array Page Activity 14-3. Use the Build Array Function End of Activity 14-3. Efficient Memory Usage: Minimizing Data Copies What is Polymorphism? Clusters Graphs Customizing Graphs Graph Cursors Graph Axes Data Acquisition Arrays Activity 14-4. Use the Graph and Analysis VIs Page End of Activity 14-4. Intensity Plots Application Control What is the VI Server? Page Activity 15-1. Use the VI Server Page Page End of Activity 15-1. Program Design Use Top-Down Design Make a List of User Requirements Design the VI Hierarchy Page Create the Program Plan Ahead with Connector Panes SubVIs with Required Inputs Good Diagram Style Watch for Common Operations Use Left-to-Right Layouts Check for Errors Page Watch Out for Missing Dependencies Avoid Overuse of Sequence Structures Study the Examples A HMI Function Reference Error Handling in the BridgeVIEW VI Library Errors Reported by the BridgeVIEW Engine Errors Not Reported by the BridgeVIEW Engine Page BridgeVIEW VI Library Page Acknowledge Alarm Get Alarm Summary Status Read Alarm Summary Page Page Page Read Event History Page Page Page Read Tag Alarm Page Page Call HTV Page Decimate Historical Trend Decimate Historical Trends Page Get Historical Tag List Get Historical Trend Info Historical Trend Statistics Page Historical Trends to Spreadsheet Page Historical Trends to Spreadsheet File Page Read Historical Trend Page Read Historical Trends Page Page Enable Event Logging Enable Historical Data Logging Enable Printing Engine Launch Engine Shutdown Get Engine Status Get Tag Status Info Post System Error or Event Tag Status Handler Page Page Check Operator Privileges Get Operator Name Invoke Login Dialog Programmatic Login Page Security Monitor Page Read Tag Page Read Tag (bit array) Page Read Tag (discrete) Page Read Tag (string) Page Tre nd Tag s Write Tag Write Tag (bit array) Write Tag (discrete) Write Tag (string) Write Tag on Change Write Tag on Change (bit array) Write Tag on Change (discrete) Write Tag on Change (string) Page Get Analog Tag Alarm Limit Get Bit Array Tag Alarm Setting Get Discrete Tag Alarm Setting Get Group List Get Tag Alarm Enabled Get Tag Attribute Get Tag Bad Status Alarm Info Get Tag Description Group Get Tag I/O Connection Info Get Tag List Get Tag Logging Info Get Tag Range and Units Set Multiple Tag Attributes Set Tag Attribute B Citadel and Open Database Connectivity What is ODBC? Configuring the ODBC Driver Page What is SQL? How Do You Access Citadel Data? Threads Table Data Transforms Page SQL Examples Queries Using Specific Applications Using Microsoft Query with Citadel Page Page Page Using Microsoft Excel with Citadel Using Microsoft Access with Citadel Using Visual Basic with Citadel Page C Customer Communication Electronic Services Bulletin Board Support FTP Support Fax-on-Demand Support Telephone and Fax Support Country Telephone Fax Technical Support Form BridgeVIEW Hardware and Software Configuration Form National Instruments Products Other Products Documentation Comment Form Title: BridgeVIEW User Manual Edition Date:May 1998 Part Number:321294C-01 Mail to:Technical Publications Fax to: Technical Publications Glossary A B C D E F G H I L M N O P R S T U V W Index A B Page C D E F G H Page I J L M N O P R S Page T Page Page Page U V W X