Download Datalogging and Supervisory Control Module Developer Manual
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Contents Configuring Device Names...............................................................3-18 Configuring Device Resources .........................................................3-19 Configuring Item Names .................................................................................3-20 Configuring Item Resources ...........................................................................3-21 Configuring a Tag to Log Data or Events .......................................................3-22 Initializing Tag Values ....................................................................................3-22 Scaling Tags ....................................................................................................3-23 Scaling Analog Tags .........................................................................3-23 Square Root and Linear Scaling .........................................3-23 Assigning Units to an Analog Tag .....................................3-26 Scaling Discrete Tags........................................................................3-26 Scaling Bit Array Tags......................................................................3-26 Setting Alarms ................................................................................................3-27 Setting Alarms for Analog Tags .......................................................3-28 Setting Alarm Deadband on Analog Tags ........................................3-28 Setting Alarms for Discrete Tags......................................................3-29 Setting Alarms for Bit Array Tags....................................................3-29 Setting Alarms for String Tags .........................................................3-30 Keeping an Alarm Unacknowledged after the Alarm Returns to Normal ..........................................................................3-30 Determining When to Use Memory Tags......................................................................3-30 Scenario 1—Use a Memory Tag .....................................................................3-30 Scenario 2—Do Not Use a Memory Tag ........................................................3-31 Creating a Memory Tag...................................................................................3-31 Customizing the Tag Configuration Editor View..........................................................3-31 Accessing Tags Over a Network ...................................................................................3-32 Sharing Tag Data with Other Applications .....................................................3-32 Viewing Tag Engine Status ...........................................................................................3-33 Configuring Tag Engine Parameters..............................................................................3-33 Monitoring and Writing Tag Values..............................................................................3-34 Chapter 4 Displaying and Controlling Data Building Front Panels ....................................................................................................4-1 Creating Front Panel Controls and Indicators .................................................4-2 Connecting Controls and Indicators to Tags.....................................4-2 Creating a Tag Control......................................................................4-3 Adding and Customizing Graphics .................................................................4-3 Building an Application with Multiple Front Panels Using the Panel Wizard.................................................................................................4-4 Block Diagram Tools and Functions .............................................................................4-5 Generating Code with the HMI Wizard ..........................................................4-5 Changing Generated Block Diagram Code .....................................................4-8 © National Instruments Corporation vii DSC Module Developer Manual