Archived: LabVIEW Datalogging and Supervisory Control Module Developer Manual

177 Pages·2001·1.47 MB·English

by  Technical Communications

LabVIEW Datalogging and
Supervisory Control Module
Developer’s Manual
Datalogging & Supervisory Control Developer’s Manual
October 2001 Edition
Part Number 321294E-01
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Conventions
This manual uses the following conventions:
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to a final action. The sequence File»Page Setup»Options directs you to
pull down the File menu, select the PageSetup item, and select Options
from the last dialog box.
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This icon denotes a note, which alerts you to important information.
This icon denotes a caution, which advises you of precautions to take to
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such as menu items and dialog box options. Bold text also denotes
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Contents
Chapter 1
Introduction
Related Documentation..................................................................................................1-1
Controls Palette..............................................................................................................1-2
Functions Palette............................................................................................................1-3
Utilities...........................................................................................................................1-5
Tag Utilities Toolbar.......................................................................................1-5
Tag Configuration Editor................................................................................1-6
Tag Monitor.....................................................................................................1-6
Tag Engine.......................................................................................................1-6
Citadel Historical Database.............................................................................1-7
Classic Historical Trend Viewer and Historical Data Viewer.........................1-7
Real-Time Database........................................................................................1-7
User Account Manager....................................................................................1-7
Server Browser................................................................................................1-8
Image Navigator..............................................................................................1-8
Customizing Your Work Environment..........................................................................1-8
Changing Palette Views..................................................................................1-9
Chapter 2
Developing an Application
Example Applications....................................................................................................2-1
Parts of a LabVIEW DSC Module Application.............................................................2-1
Basics Steps for Developing an Application.................................................................2-2
Chapter 3
Servers
Selecting a Server..........................................................................................................3-2
IAK Servers.....................................................................................................3-2
Installing and Configuring Servers................................................................................3-3
Registering and Unregistering Servers............................................................3-3
Registering OPC Servers..................................................................3-3
Registering DDE Servers..................................................................3-3
Registering VI-Based Servers...........................................................3-3
Unregistering a Device Server..........................................................3-4
Launching Server Configuration Utilities.......................................................3-5
© National Instruments Corporation v Datalogging & Supervisory Control Developer’s Manual
Contents
Viewing Server Information...........................................................................3-5
Viewing Information about All Servers...........................................3-5
Viewing Information about Running Servers...................................3-6
Connecting Server Items to Tags..................................................................................3-7
Testing a Server.............................................................................................................3-7
Accessing OPC Servers Using the LabVIEW DSC Moduleas an OPC Client............3-8
Configuring the LabVIEW DSC Module OPC Client....................................3-8
Accessing Remote OPC Servers through the LabVIEW DSC Module..........3-9
Accessing Remote OPC Servers with dcomcnfg.exe.....................................3-9
Connecting to Data Published by LabVIEW Real-Time..............................................3-10
Using Other Remote Servers.........................................................................................3-11
Using DDE Servers with the LabVIEW DSC Module.................................................3-11
Developing Device Servers...........................................................................................3-11
Chapter 4
Using Tags to Manage I/O in LabVIEW
Configuration Files........................................................................................................4-1
Changing the Active SCF File........................................................................4-2
Changing the Active SCF File Manually.........................................4-2
Changing the Active SCF File Programmatically............................4-2
Creating Tags.................................................................................................................4-2
Generating Tags Automatically......................................................................4-3
Creating Tags Manually..................................................................................4-5
Importing Network Tags.................................................................................4-6
Importing Virtual DAQ Channels as Tags......................................................4-7
Creating Tags from the HMI Wizard..............................................................4-7
Editing Tags...................................................................................................................4-7
Editing Tag Configuration Manually..............................................................4-7
Editing Tag Configuration Programmatically.................................................4-8
Editing Tag Configuration in a Spreadsheet...................................................4-8
Exporting Tag Configuration to a Spreadsheet................................4-9
Importing Tag Configuration from a Spreadsheet............................4-9
Defining Default Values for Tag Configuration Fields.................................................4-9
Setting Tag Deadbands..................................................................................................4-10
Deadbanding Interaction.................................................................................4-10
Setting Update Deadbands..............................................................................4-11
Example............................................................................................4-11
Setting Log Deadbands...................................................................................4-11
Example............................................................................................4-11
Setting Alarm Deadbands...............................................................................4-12
Example............................................................................................4-12
Setting I/O Group Deadbands with OPC Servers...........................................4-12
Deleting Tags.................................................................................................................4-13
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Contents
Configuring Tag Attributes............................................................................................4-13
Tag Data Type.................................................................................................4-14
Analog Tags......................................................................................4-14
Discrete Tags.....................................................................................4-14
Bit Array Tags...................................................................................4-15
String Tags........................................................................................4-15
Static and Dynamic Attributes.........................................................................4-15
Defining a Tag Group......................................................................................4-16
Configuring I/O Groups..................................................................................4-16
Configuring DDE Devices and Items...............................................4-17
Configuring Communication Resources...........................................4-18
Configuring Device Names...............................................................4-19
Configuring Device Resources.........................................................4-19
Configuring Item Names.................................................................................4-20
Configuring Item Resources...........................................................................4-21
Configuring a Tag toLog DataorEvents.......................................................4-22
Setting Startup Tag Values..............................................................................4-22
Scaling Tags....................................................................................................4-23
Scaling Analog Tags.........................................................................4-23
Square Root and Linear Scaling.........................................4-23
Assigning Units to an Analog Tag.....................................4-26
Scaling Discrete Tags........................................................................4-26
Scaling Bit Array Tags......................................................................4-26
Setting Alarms ................................................................................................4-27
Setting Alarms for Analog Tags.......................................................4-28
Setting Alarm Deadband on Analog Tags........................................4-28
Setting Alarms for Discrete Tags......................................................4-29
Setting Alarms for Bit Array Tags....................................................4-29
Setting Alarms for String Tags.........................................................4-30
Keeping an Alarm Unacknowledged afterthe Alarm Returns
to Normal.......................................................................................4-30
Determining When to Use Memory Tags......................................................................4-30
Scenario 1—Use a Memory Tag.....................................................................4-30
Scenario 2—Do Not Use a Memory Tag........................................................4-31
Creating a Memory Tag...................................................................................4-31
Customizing the Tag ConfigurationEditor View..........................................................4-31
Accessing Tags Over a Network...................................................................................4-32
Accessing Tags Over the Network using BridgeVIEW..................................4-32
Sharing Tag Data with Other Applications.....................................................4-33
Viewing Tag Engine Status...........................................................................................4-33
Configuring Tag Engine Parameters..............................................................................4-35
Monitoring and Writing Tag Values..............................................................................4-36
© National Instruments Corporation vii Datalogging & Supervisory Control Developer’s Manual
Contents
Chapter 5
Displaying and Controlling Data
Building Front Panels....................................................................................................5-1
Creating Front Panel Controls and Indicators.................................................5-2
Connecting Controls and Indicators to Tags....................................5-2
Creating a Tag Control.....................................................................5-3
Adding and Customizing Graphics.................................................................5-3
Building an Application with Multiple Front Panels Using
the Panel Wizard..........................................................................................5-4
Block Diagram Tools and Functions.............................................................................5-5
Auto-Generating Code with the HMI Wizard.................................................5-5
Changing Auto-Generated Block Diagram Code...........................................5-8
Tag Data Types...............................................................................................5-8
Tasks Common to Both Tags and Alarms & Events VIs...............................5-9
Reading Tag Engine Status Programmatically.................................5-9
Starting or Stopping the Tag Engine Manually................................5-10
Setting the Database Read Rate........................................................5-10
Updating Tag Displays When Values Change.................................5-10
Determining When the HMI Needs to Be Initialized.......................5-11
Controlling System Behavior Programmatically...........................................................5-11
Starting or Stopping the Tag Engine Programmatically.................................5-11
Starting or Stopping Historical Logging Programmatically...........................5-11
Starting or Stopping Event Logging Programmatically..................................5-11
Starting or Stopping Event Printing Programmatically..................................5-12
Changing Tag Attributes Programatically.....................................................................5-12
Example of Changing Tag Attributes Programmatically................................5-13
Setting Timing Execution of While Loops....................................................................5-15
Implementing Event-Driven Programming....................................................5-16
Implementing Polled Programming................................................................5-17
Initialize and Shut Down Multiple-Loop Applications ..................................5-19
Displaying Trends.........................................................................................................5-19
Displaying Real-Time Trends.........................................................................5-19
Displaying Historical Trends..........................................................................5-20
Chapter 6
Alarms and Events
Logging and Printing for Alarms and Events................................................................6-2
Viewing Alarms and Events..........................................................................................6-2
Viewing Alarms and Events with the Alarm & Event Display Control.........6-3
Acknowledging Alarms in the Alarm & Event Display Control......6-3
Filtering Alarms and Events in the Alarm & Event
Display Control..............................................................................6-4
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Contents
Using an Alarm Summary Display..................................................................6-5
Using an Event History Display......................................................................6-5
Acknowledging Alarms in the Alarm Summary and Event
History Displays...........................................................................................6-6
Reporting and Viewing Alarm Status in the Alarm Summary and
Event History Display..................................................................................6-7
Viewing System Errors and Events...............................................................................6-7
Archiving and Extracting Alarm and Event Information..............................................6-7
Error Handling...............................................................................................................6-8
Errors Reported by the Tag Engine.................................................................6-8
Errors Not Reported by the Tag Engine..........................................................6-8
Chapter 7
Historical Data Logging and Extraction
Citadel Historical Database...........................................................................................7-1
Logging Historical Data.................................................................................................7-2
Logging Data in Sets......................................................................................................7-3
Creating a Data Set for Logging......................................................................7-3
Editing Data Sets for Logging..........................................................7-9
Considerations for the Data Set Logger............................................7-9
Retrieving Logged Data Sets............................................................7-9
Archiving Historical Data..............................................................................................7-10
Converting Older Citadel Database Files......................................................................7-10
Extracting and Viewing Historical Data........................................................................7-11
Accessing Historical Data Using Historical Data VIs.....................................7-13
Using URLs with Historical Data VIs..............................................7-14
Accessing Historical Data Using the Historical Trend Viewer.......................7-15
Selecting Tags to Display in the HTV..............................................7-16
Changing the HTV Time Axis with Panning Buttons......................7-16
Changing the HTV Time Axis Manually..........................................7-17
Changing the HTV Timespan ofDataDisplayed.............................7-17
Viewing an HTV Tag Value ataSpecificPoint inTime.................7-18
Changing the HTV Y-Axis...............................................................7-18
Changing the HTV Plot Colors andStyle.........................................7-18
Zooming In on an HTV.....................................................................7-18
Exporting HTV Data to a Spreadsheet..............................................7-19
Setting HTV Tag, Time, and Color Preferences...............................7-19
Viewing Newly Logged HTV Data Automatically..........................7-19
Calling the HTV from an Application..............................................7-20
Printing Historical Data.................................................................................................7-20
© National Instruments Corporation ix Datalogging & Supervisory Control Developer’s Manual
Contents
Chapter 8
Security
Creating and Editing User and Group Accounts...........................................................8-1
Creating User Accounts..................................................................................8-1
Creating Groups..............................................................................................8-2
Modifying User and Group Accounts.............................................................8-3
Special Pre-Defined User and Group Accounts..............................................8-3
Logging In and Out.........................................................................................8-4
Accessing User Information............................................................................8-4
Changing Your Password................................................................................8-4
Restricting Access totheLabVIEW Environment........................................................8-4
Setting Access to Front Panel Controls and Indicators...................................8-5
Setting Permissions for Accessing Tools........................................................8-5
Configuring Access to a Specific Tag.............................................................8-6
Setting SCF File Access..................................................................................8-6
Setting Data Access........................................................................................8-7
Setting Network Access for Specific Users, Groups,
or Computers.................................................................................8-8
Setting a Proxy User Account..........................................................8-9
Setting an Engine User Account.......................................................8-10
Setting Tag Configuration Editor Access.......................................................8-10
Setting Startup Login Options.........................................................................8-11
Checking User Privileges................................................................................8-11
Disabling Special Keys...................................................................................8-11
Prompting an Operator to Log intoanApplication........................................8-12
Logging anOperatorintoor out ofan Application Programmatically...........8-12
Identifying the Current Operator.....................................................................8-12
Chapter 9
Networking and Deploying Applications
Deploying Application Files..........................................................................................9-1
LabVIEW DSC Run-Time System.................................................................9-1
Building an Executable Application from a VI..............................................9-1
Applications that Include LabVIEW DSC Module VIs..................................9-2
Applications that Include Only Security VIs..................................................9-2
What to Include with Your Application..........................................................9-3
Setting up Networked Applications...............................................................................9-4
Logos Networking Technology......................................................................9-4
Registering Networked Computers.................................................................9-4
Setting up Time Synchronization for Networked Computers.........................9-5
Determining Time Server Search Order...........................................9-6
Configuring Time Synchronization..................................................9-6
Datalogging & Supervisory Control Developer’s Manual x ni.com