Rockwell-automation FactoryTalk View Machine Edition Users Guide Bedienungsanleitung Seite 495
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23 • Use expressions
23-17
• • • • •
Nested if-then-else
You can also nest an if-then-else structure inside the Then or Else part of an if-then-else
structure.
Example 1: Nested if-then-else
This expression:
if statement1 then value1
else if statement2 then value2
else value3
has this interpretation:
- View Machine Edition 1
- Contents 3
- 3 • Plan applications 4
- 4 • Work with applications 4
- 5 • Set up communications 5
- 6 • Work with tags 5
- 7 • Use HMI tags 6
- 8 • Set up global connections 6
- 9 • Set up alarms 7
- 11 • Set up security 9
- • • • • • 10
- 17 • Use your application 12
- 18 • Work with components 14
- 19 • Use graphic displays 14
- 20 • Use graphic objects 15
- 21 • Set up graphic objects 17
- 22 • Animate graphic objects 18
- 23 • Use expressions 19
- 24 • Use embedded variables 20
- 26 • Set up data logging 20
- 27 • Use information messages 21
- 28 • Set up trends 21
- 30 • Use macros 22
- 29 • Set up RecipePlus 22
- C • System tags 24
- D • ODBC database schema 24
- F • RFC1766 names 24
- About the documentation 28
- Find the information you need 29
- Information on the Internet 29
- Getting Started 31
- FactoryTalk tools 33
- Start FactoryTalk View Studio 35
- Exit FactoryTalk View Studio 35
- Open sample applications 36
- The menu bar 38
- The toolbar 39
- The Explorer window 39
- The workspace 39
- The Diagnostics List 39
- The status bar 40
- Workbook tabs 41
- Use the Explorer window 42
- View the Explorer window 44
- Work with editors 44
- Locate editors 44
- Open editors 45
- Close editors 46
- Select a printer 48
- Print at run time 49
- Plan applications 51
- Collect data 52
- Design an HMI tag database 52
- Collect information 52
- Organize tags 52
- Plan graphic displays 53
- Design displays 54
- Usability 55
- Plan languages 55
- Plan alarms 56
- Diagnostics messages 56
- Plan trends 56
- Plan recipes 57
- Design a secure system 57
- Work with applications 59
- Run-time application file 60
- Component files 60
- External folders 60
- Naming files 62
- Creat applications 62
- Import applications 63
- Open applications 65
- Open multiple applications 67
- FactoryTalk View ME 67
- Close applications 68
- About project settings 69
- Title bar 73
- Specify project settings 75
- View application properties 76
- View HMI server properties 76
- Set up communications 79
- Create data servers 80
- Set up an OPC data server 81
- Update data server caches 82
- Work with tags 85
- HMI tags 86
- Basic steps for using tags 86
- When to use data server tags 87
- Eliminate duplication 87
- Use complex data 87
- When to use HMI tags 88
- Steps for using HMI tags 89
- Browse for tags 89
- Use the Tag Browser 90
- Show server names 91
- Browse for off-line tags 91
- Log tag values 96
- Use HMI tags 97
- How values are rounded 98
- Use the Tags editor 99
- Search for HMI tags 100
- Data sources 102
- The data source 102
- Organize HMI tags 104
- Name tags 104
- Use folders to group tags 105
- View tag statistics 105
- Set up global connections 111
- Update the date and time 112
- Change displays 114
- Set up remote display changes 115
- Print displays 115
- Close On Top displays 116
- Run macros 116
- Monitor run-time RAM usage 117
- Set up alarms 121
- Summary of steps 122
- Prepare to set up alarms 123
- Tags and expressions 124
- Identify alarm conditions 124
- How alarms work 124
- Alarm notification methods 126
- Show alarm information 126
- Interact with alarms 127
- The alarm log file 130
- Alarm trigger data types 131
- The Value trigger type 131
- The Bit trigger type 132
- Tips for using array tags 135
- Equivalent data types 136
- RSLinx Enterprise tag syntax 136
- ’s messages in 137
- How the Ack connection works 139
- How messages are queued 143
- The [ALARM] display 146
- The [ALARM BANNER] display 146
- The [STATUS] display 148
- The [HISTORY] display 149
- Create your own alarm display 151
- Open the display 151
- Close the display 151
- What is shown 152
- How the list scrolls 153
- Alarm buttons 156
- Link buttons to objects 157
- Key buttons 158
- Acknowledge all alarms 159
- Silence alarms 159
- Clear and delete messages 160
- Sort alarms 160
- Reset alarm status 160
- Retain alarm status 161
- About FactoryTalk Diagnostics 163
- Browse diagnostics messages 163
- Destinations 164
- Message routing 165
- Categories 165
- Message severities 166
- Audiences 166
- Log to an ODBC database 169
- Route messages 170
- The [DIAGNOSTICS] display 173
- Set up security 177
- The DEFAULT user 181
- Log out automatically 190
- Application examples 191
- Uncommon security permissions 197
- Set up language switching 201
- The default language 202
- Install Windows languages 204
- Set up Windows fonts 204
- Windows locale settings 205
- Remove languages 206
- Export text in Unicode format 206
- Problems exporting 208
- File name and format 209
- File schema 211
- Call "Duty Manager" 212
- Call Duty Manager 212
- Import text 213
- Problems importing 214
- Cancel importing 214
- Set up display navigation 217
- Test display navigation 219
- Switch languages 219
- Display type 220
- Goto display buttons 220
- Goto configure mode buttons 220
- Return to display buttons 221
- Close display buttons 222
- Display list selectors 222
- Shutdown buttons 223
- Create run-time applications 225
- Test your application 226
- Load and run applications 236
- Shut down applications 237
- Change application settings 238
- Edit device shortcuts 238
- Delete log files manually 248
- Use the DeskLock tool 249
- About the download 256
- Serial downloads 256
- About the upload 258
- Serial uploads 258
- Compare applications 258
- Use your application 259
- Domain authentication 260
- Log in to the application 265
- 4.00 and later applications 265
- 3.20 and earlier applications 265
- Problems with logging in 267
- Change passwords 268
- Add a user or group 272
- Delete a user or group 274
- Unlock a user 278
- Disable a user 280
- Enable a user 280
- Change User Properties 281
- Enter numeric values 281
- Activate the cursor point 282
- Ramp numeric values 282
- Use the numeric pop-up keypad 282
- How values are ramped 284
- How values are calculated 285
- Enter string values 286
- Change tag values 291
- View tag data 293
- View alarms and messages 295
- Change languages 296
- Work with components 297
- Create components 298
- Open components 298
- Save components 298
- Close components 298
- Delete components 300
- Remove components 300
- Rename components 300
- Duplicate components 301
- Use graphic displays 303
- Before you begin 304
- Use the Graphics editor 305
- Use context menus 308
- Use the toolbars 309
- Show displays in grayscale 310
- Use the grid 310
- Zoom in and out 311
- Correct mistakes 312
- Set up graphic displays 313
- Specify display settings 313
- About display types 314
- Resize displays 315
- Use graphic libraries 316
- Work with Symbol Factory 316
- To open Symbol Factory: 317
- To select a graphic: 317
- Manipulate the graphic: 317
- Create graphic libraries 318
- Use Symbol Factory 326
- Tips for using images 327
- Use local messages 328
- Use the Local Messages editor 329
- How local messages work 330
- Print displays at run time 332
- Use graphic objects 335
- About connections 336
- Illustrate your displays 337
- Control the application 337
- Start and control processes 338
- Show alarms and messages 344
- Create graphic objects 346
- Create drawing objects 347
- Create text 347
- Create images 349
- Create panels 350
- Create arcs and wedges 351
- Create ellipses and circles 352
- Create freehand shapes 352
- Create lines 352
- Create polygons and polylines 353
- Create rectangles and squares 354
- Use .wmf and .dxf files 356
- Use ActiveX objects 356
- Select and deselect objects 358
- Use the Object Explorer 359
- Use the Properties dialog box 361
- Use the Property Panel 364
- Set up properties 365
- Name objects 368
- Assign tags 370
- Use tag placeholders 374
- Move objects 376
- Copy objects 377
- Duplicate objects 379
- Resize objects 379
- Reshape drawing objects 381
- Delete objects 382
- Work with groups of objects 382
- Group and ungroup objects 382
- Edit groups of objects 383
- Edit objects within a group 384
- Arrange objects 385
- Layer objects 385
- Align objects 387
- Space objects 389
- Flip drawing objects 390
- Rotate drawing objects 390
- Lock objects into position 391
- Set up graphic objects 393
- Add and remove states 395
- Use touch margins 396
- Function key equivalents 398
- What input focus looks like 400
- Set up buttons 408
- How to use push buttons 410
- Set up Momentary push buttons 411
- Set up Latched push buttons 414
- Set up Ramp buttons 419
- Set up numeric displays 420
- How values are shown 420
- Problems with showing values 420
- Set up string displays 425
- Set up Goto display buttons 427
- Set up close display buttons 428
- Set up display list selectors 429
- How to use indicators 431
- Set up multistate indicators 431
- Set up symbols 433
- Set up list indicators 434
- Set up bar graphs 438
- Set up gauges 439
- Set up scales 440
- Set up control list selectors 441
- Set up local message displays 446
- Set up Macro buttons 448
- Set up time and date displays 449
- Set up alarm lists 452
- Set up alarm banners 453
- Set up alarm status lists 454
- Set up diagnostics lists 456
- Animate graphic objects 459
- Use the Animation dialog box 460
- Test animation 463
- Use expressions 464
- Define a range of motion 465
- Use Object Smart Path 465
- Set up visibility animation 467
- Set up color animation 468
- Set up fill animation 471
- Set up width animation 472
- Set up height animation 473
- Set up rotation animation 473
- Apply animation to groups 474
- Expression components 480
- Use the Expression editor 480
- Where you can use expressions 482
- Format expressions 482
- Constants 484
- Arithmetic operators 484
- String operands 485
- Relational operators 485
- Logical operators 485
- Bitwise operators 486
- Use the left shift operator 487
- Evaluation order of operators 488
- Mathematical functions 491
- Security functions 491
- Language function 492
- , information 493
- If-then-else 494
- Nested if-then-else 495
- Use write expressions 496
- Use embedded variables 499
- Create embedded variables 500
- Embedded variable syntax 501
- Numeric embedded variables 505
- String embedded variables 506
- Create parameter files 510
- Use the Parameters editor 511
- Use global objects 516
- Create reference objects 518
- Delete the base object 520
- Use global object parameters 520
- Set up data logging 525
- Data Log Models 526
- Create Data Log Models 526
- Data storage locations 527
- Data logging methods 527
- Tags in the data log model 528
- Problems with data logging 529
- Use information messages 531
- How information messages work 534
- The [INFORMATION] display 536
- Set up trends 539
- Create trend objects 541
- The parts of a trend 543
- Trend border 543
- Trend window 543
- Pen icons 545
- Pen markers 545
- Chart types 545
- Standard vs. XY Plots 545
- Isolated graphing 546
- The trend border color 547
- The trend window color 547
- Test the trend 548
- Print trend data 550
- Run-time errors for the trend 550
- Set up RecipePlus 551
- How the recipe system works 552
- RecipePlus selector 552
- RecipePlus table 552
- RecipePlus button 553
- Number format 554
- Numeric limits 554
- Set up recipe files 556
- Compare recipes 558
- Time and date formats 559
- Print recipes 559
- Create RecipePlus objects 560
- Test RecipePlus objects 560
- Use macros 565
- Use the Macros editor 566
- When to use macros 566
- Where to assign macros 568
- Terminology 569
- Equivalent graphic objects 573
- Unsupported graphic objects 576
- Screen security settings 577
- Block tags 577
- Unsupported tag data types 577
- Unsupported initial values 578
- Convert RIO communications 578
- Convert expressions 581
- Equivalent expression syntax 582
- Unsupported expression syntax 583
- Order of precedence 584
- Bit array tags 592
- System tags 597
- ODBC database schema 601
- About XML 603
- Edit XML files 604
- Save XML files in Notepad 604
- Test XML files 604
- Import XML files 605
- Error log file 605
- Import alarm XML files 605
- RFC1766 names 607
- Which versions are supported 613
- Active and unacknowledged 620
- Import graphics XML files 625
- Graphics XML file structure 625
- See .dxf files 635
- See .bmp files 636
- See Graphic Displays editor 641
- See Window size 641
- See Graphic displays 641
- See Communication drivers 642
- See Process faceplates 644
- See also Diagnostics messages 644
- See also Base objects 646
- See also Reference objects 646
- See Special keys 652
- See also 653
- See also Tag values 654
- See also Languages 655
- See Graphic libraries 656
- See WINtelligent LOGIC 5 tags 656
- See data servers, OPC 661
- See Tag placeholders 663
- See Current trends 665
- See Diagnostics messages 671
- See .wmf files 677
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