National Instruments BridgeVIEW Chapter 5 Alarms and Events, Chapter 6 Historical Data Logging and Extraction

Contents
© National Instruments Corporation ix BridgeVIEW User Manual
General Principles of G HMI Programming......................................................................4-25
How Do You Implement Event-Driven Programming in G?..............................4-25
How Do You Implement Polled Programming in G?.........................................4-27
How Do You Initialize and Shut Down Multiple-Loop Applications?...............4-28
How Do You Display Real-Time Trends?.......................................................... 4-29
How Can You Use Tag Attributes to Configure HMI Indicator
Attributes Programmatically? ..........................................................................4-31
Chapter 5
Alarms and Events
What are Alarms and Events?..............................................................................................5-1
Alarm States..........................................................................................................5-1
Alarm Limit...........................................................................................................5-1
Alarm Priority........................................................................................................5-2
Alarm Summary....................................................................................................5-2
Event History.........................................................................................................5-2
How Do You Display Alarm Summary Information?.........................................................5-2
How Do You Display Event History Information?.............................................................5-6
How Do You Acknowledge Alarms? .................................................................................5-6
How Do You Configure Logging and Printing of Alarms and Events? ............................5-10
How Do You Log Alarms and Events?...............................................................5-12
How Do You Print Alarms and Events?..............................................................5-13
How Do You View Alarms and Events?.............................................................5-14
Chapter 6
Historical Data Logging and Extraction
What Is a Trend?..................................................................................................................6-1
Real-Time Trend ...................................................................................................6-1
Historical Trend.....................................................................................................6-1
What Is Citadel?...................................................................................................................6-1
How Do You Log Historical Data? .....................................................................................6-2
How Do You Configure Historical Logging?....................................................... 6-3
How Do You Extract and View Data from Historical Log Files?.......................................6-4
Historical Data VIs................................................................................................6-4
Historical Trend Viewer (HTV)............................................................................6-9
How Do You Select the Tags to Display? ............................................6-10
How Do You Change the Time Axis?..................................................6-10
Panning Buttons......................................................................6-11
Manual Changes.....................................................................6-11
How Do You Change the Timespan of Data Displayed? .....................6-12
How Do You View the Value of a Tag at
a Specific Point in Time? ...................................................................6-12