Campbell-scientific CR9000X Measurement and Control System Manual de usuario Pagina 147
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Section 4. CRBasic – Native Language Programming
4.2.5 Constants
A constant can be declared at the beginning of a program to assign an
alphanumeric name to be used in place of a value so the program can refer to
the name rather than the value itself. Using a constant in place of a value can
make the program easier to read and modify, and more secure against
unintended changes. Constants can be changed while the program is running if
they are declared using the ConstTable/EndConstTable instruction. See
Example 4.2.5-1.
Programming Tip: Using all uppercase for constant names may make them
easier to recognize.
EXAMPLE 4.01. CRBASIC Code: Using the Const Declaration
Public MTempC, PTempF
ConstTable
Const CTOF_MULT = 1.8
Const CTOF_OFFSET = 32
EndConstTable
BeginProg
Scan (1,Sec,0,0)
ModuleTemp (MTempC,1,4,250)
MTempF = MTempC * CTOF_MULTult + CTOF_OFFSET
NextScan
EndProg
4.2.6 Flags
Flags are a useful program control tool. While any variable of any data type
can be used as a flag, using Boolean variables, especially variables named
“Flag”, works best. If the value of the variable is -1 the flag is high. If the value
of the variable is 0 the flag is low (Section 4.6). CSI's logger support software
looks for the variable array with the name Flag when the option to display flag
status is used in one of the real time screens. EXAMPLE 4.0-1 shows an
example using flags to change the word in string variables.
EXAMPLE 4.0-1. CRBASIC Code: Flag Declaration and Use
Public Flag(8) As Boolean
Public FlagReport(2) As String
BeginProg
Scan (1,Sec,0,0)
If Flag(1) = True Then
FlagReport(1) = "High"
Else
FlagReport(1) = "Low"
EndIf
If Flag(2) = True Then
FlagReport(2) = "High"
Else
FlagReport(2) = "Low"
EndIf
NextScan
EndProg
4-19
- CR9000X Measurement and 1
- Control System 1
- Warranty 3
- Assistance 4
- CR9000X Table of Contents 5
- Quick Start 9
- QS1. Setting Up 10
- QS1.4 Powering the Logger 11
- Click on to set up 11
- QS1.6.1 IP Port Setup Tips 18
- QS3. RealTime Monitoring 26
- QS4. Data Collection 27
- QS5. View Data 28
- Processor 29
- Communication Ports 30
- Peripheral Compatibility 30
- PC-Card LED Indicator Status 31
- Instruction Set 31
- Overview 33
- MADE IN USA 34
- CR9032 CPU Module 36
- CR9041 A D 38
- LOGAN, UTAH 38
- OV1.2 Measurement Modules 39
- CR9052DC MADE IN USA 42
- CR9052EC 42
- CR9052IEPE 44
- 9055 50V ANALOG INPUT 45
- CR9058E Isolation Module 46
- CR9060 Excitation Module 47
- CR9071E COUNTER MADE IN USA 50
- CR9071EC 50
- OV2.1 Memory 52
- OV2.3 Data Tables 53
- OV4. Support Software 55
- LoggerNet 56
- Short Cut 57
- View Pro 57
- RTMC Pro 57
- RTMC Web Server 58
- OV5. Specifications 59
- Section 1. Installation 63
- 1.1.3 Junction Boxes 64
- 1.2.3 Solar Panels 68
- 1.2.5 Safety Precautions 69
- 1.3.1 Desiccant 69
- 1.3.2 Nitrogen Purging 69
- 2.1.1 Internal Flash Memory 73
- 2.1.3 PCMCIA PC Card 73
- 2.2 Internal Data Format 74
- 2.2.1 NAN and ±INF 75
- 2.3 Data Collection 77
- 2.3.1.1 Collect Mode 78
- 2.3.1.2 File Mode 78
- 2.3.1.3 File Format 79
- 2.3.5 Converting File Format 81
- 2.4 Data Format on Computer 82
- LINE 5 Field Data Type 84
- LINE 6 Time Stamp 84
- Details 89
- 3.1.1.2 Delay 90
- 3.1.1.3 Integration 91
- ±5 V Input Limits of the 93
- 3.1.3 Signal Settling Time 96
- Settling Time 98
- 3.1.4.1 Error Analysis 99
- Time(hrs) 100
- if a differential 101
- can be minimized by making 105
- entirely true 109
- IntegTime 113
- Sync Order 1 114
- Sync Order 5 114
- CHART 3.2.2-2 115
- Tau= 5.0 Seconds 120
- Tau = 0.5 Seconds 120
- Tau = 5.0 Seconds 121
- VARIOUS WINDOWING FUNCTIONS 122
- PERIOD (P) 125
- ±20 V 127
- Programming 129
- Output Rate 132
- ‘Define Public Variables 132
- 4.2 CRBasic Programming 134
- 4.2.2 Numerical Entries 135
- 4.2.3 Programming Structure 135
- CallTable Temp 137
- 4.2.4 Declarations 139
- 4.2.4.3 Dimensions 140
- 4.2.4.4 Data Types 140
- 4.2.5 Constants 147
- 4.2.6 Flags 147
- 4.2.7 Parameter Types 148
- 4.2.8 Data Tables 148
- 4.2.8.1 DataTable/EndTable 150
- 4.2.9.1 Scan Instruction 153
- 4.2.9.2 SubScan 153
- 4.2.9.3 SlowSequence 156
- 4.2.11 Expressions 162
- 4.2.11.5 String Expressions 166
- Alias VariableA = VariableB 171
- [ Return (expression) ] 177
- [ ExitFunction ] 177
- EndFunction 177
- StationName 181
- SUB, EXIT SUB, END SUB 182
- Subroutine Example 184
- 6.1 Data Table Declaration 185
- 6.2 Trigger Modifiers 186
- DATAINTERVAL PARAMETERS 187
- OpenInterval 188
- DATAEVENT PARAMETERS 191
- FillStop 192
- WORSTCASE PARAMETERS 194
- CardFlush 195
- CardOut (StopRing, Size) 195
- CARDOUT PARAMETERS 196
- DSP4 (FlagVar, Rate) 196
- DSP4 PARAMETERS 196
- FFT PARAMETERS 198
- HISTOGRAM PARAMETERS 203
- UpLim3, LowLim4, UpLim4) 204
- LEVELCROSSING PARAMETERS 205
- · . . . . . . . · 207
- MAXIMUM PARAMETERS 209
- MEDIAN PARAMETERS 210
- MINIMUM PARAMETERS 210
- MOMENT PARAMETERS 211
- UpperLimit, MinAmp, Form) 211
- # of Mean Ranges 212
- CYCLIC STRESS 213
- RAINFLOW PARAMETERS 215
- SampleFieldCal 215
- SAMPLE PARAMETERS 216
- SAMPLEMAXMIN PARAMETERS 217
- STDDEV PARAMETERS 218
- TOTALIZE PARAMETERS 218
- WINDVECTOR PARAMETERS 219
- Measured raw data: 220
- Calculations: 221
- ()(( /)) ( /) 223
- ΘuUS US=− =−21 811 223
- 7.1 Voltage Measurements 225
- 7.4 Self Measurements 225
- 7.5 Peripheral Devices 225
- 7.6 Pulse/Timing/State 226
- 7.7 Serial Sensors 226
- CR9058E*: 228
- VOLTSE PARAMETERS 229
- TCDIFF PARAMETERS 230
- S.E. Chanel 231
- Thermocouple 231
- TCSE PARAMETERS 232
- 7.3.2 Bridge Excitation 233
- 7.3.3 Half Bridges 234
- 7.3.4 Full Bridges 237
- AM25T PARAMETERS 241
- CS7500 PARAMETERS 242
- SDMA04 PARAMETERS 243
- SDMCAN PARAMETERS 244
- SDMCD16AC PARAMETERS 250
- SDMCVO4 PARAMETERS 251
- SDMINT8 INTERVAL TIMER 251
- SDMINT8 PARAMETERS 252
- SDMIO16 PARAMETERS 254
- ValuesPerRep, Mult, Offset) 255
- SDMSIO4 PARAMETERS 255
- Offset) 255
- SDMSW8A PARAMETERS 256
- SDMSpeed (BitPeriod) 256
- SDMSPEED PARAMETER 256
- SDMTrigger 257
- SDMX50 (SDMAddress, Channel) 257
- Mult, Offset) 258
- ± 20 V 260
- PULSECOUNT PARAMETERS 261
- PulseCountReset 261
- PulseCountReset Example 1 262
- PulseCountReset Example 2 263
- ReadIO (Dest, PSlot, Mask) 263
- READIO PARAMETERS 264
- Function 8–1, AllDoneFlag) 264
- TIMERIO PARAMETERS 265
- SERIALINPUT PARAMETERS 267
- SerialInput Example 267
- VOLTFILT PARAMETERS 269
- SUBSCAN PARAMETERS 270
- Filter Module Memory Buffer 272
- FFTFILT PARAMETERS 273
- Constant,Variable 274
- Array, Expression 274
- =×= 11 281
- FFTSample (Source, DataType) 286
- FFTSAMPLE PARAMETERS 286
- Instructions 287
- >> 6 288
- >> 4 288
- ABS(Source) 289
- ACOS (Source) 289
- AND Operator 290
- ASIN (Source) 291
- ATN(Source) 291
- ATN2(Source) 292
- AVGRUN PARAMETERS 295
- AvgSpa (Dest, Swath, Source) 296
- AVGSPA PARAMETERS 296
- Ceiling(Source) 296
- COS(Source) 296
- CosH (Source) 297
- DewPoint (Dest, Temp, RH) 299
- DEWPOINT PARAMETERS 299
- EXP(number) 301
- FFTSPA PARAMETERS 302
- Floor (Source) 304
- FRAC(Source) 305
- Hex (Expression) 305
- HexToDec (Expression) 305
- IFTIME PARAMETERS 307
- IIF PARAMETERS 308
- INT(Source), Fix(Source) 309
- LOG(Source) or LN(Source) 309
- LOG10 (source) 310
- MaxSpa(Dest, Swath, Source) 310
- MAXSPA PARAMETERS 310
- MinSpa(Dest, Swath, Source) 311
- MINSPA PARAMETERS 311
- OR Operator 312
- PEAKVALLEY PARAMETERS 313
- PRT PARAMETERS 315
- PRTCALC PARAMETERS 316
- Randomize(Source) 316
- RectPolar (Dest, Source) 317
- RECTPOLAR PARAMETERS 317
- RMSSpa(Dest, Swath, Source) 317
- RMSSPA PARAMETERS 318
- Round(Source, Decimal) 318
- RND Function 318
- SGN Function 319
- SIN(Source) 320
- SINH (Source) 320
- SortSpa(Dest, Swath, Source) 320
- SORTSPA PARAMETERS 321
- SQR(Source) 321
- STDDEVSPA PARAMETERS 322
- SatVP (Dest, Temp) 322
- STRAINCALC PARAMETERS 323
- 1/4 BRIDGE STRAIN 324
- 1/2 BRIDGE STRAIN 324
- Full Bridge Strain 325
- Tan(Source) 327
- TANH (Source) 327
- VAPORPRESSURE PARAMETERS 328
- Derived Math Functions 329
- CallTable 332
- CallTable Name 332
- Default Program 332
- Syntax 2 Do 334
- Exit Do] 334
- FileManage 335
- FILEMANAGE PARAMETERS 335
- FileMark(TableName) 336
- FILEMARK PARAMETERS 336
- For ... Next Statement 338
- Exit For] 338
- Include 342
- RunDLDFile 343
- SCAN PARAMETERS 345
- SCAN PARAMETERS CON'T 346
- SETSTATUS PARAMETERS 349
- Slot12CardID) 350
- SlowSequence(TimeSlice) 350
- SubScan/NextSubScan 352
- WaitDigTrig 355
- WAITDIGTRIG PARAMETERS 356
- BiasComp 357
- Calibrate 357
- CALFILE PARAMETERS 358
- EXCITE PARAMETERS 360
- Index, Avg) 361
- Mode value 362
- FIELDCAL PARAMETERS 363
- Zeroing 366
- for Function 43 367
- = micro-strain 368
- FIELDCALSTRAIN PARAMETERS 369
- GETRECORD PARAMETERS 372
- InstructionTimes(Dest) 372
- LoadFieldCal 373
- MOVE PARAMETERS 374
- NewFieldCal 374
- NEWFIELDNAMES PARAMETERS 375
- PORTSET PARAMETERS 375
- Power Off 376
- POWEROFF PARAMETERS 376
- Powerup.ini 377
- Command,File,Device 377
- POWERUP.INI FILE PARAMETERS 379
- RealTime(Dest) 379
- Reset Table 380
- ResetTable( TableName ) 380
- SecsSince1990 380
- SECSSINCE1990 PARAMETERS 381
- TIMER PARAMETERS 381
- WriteIO(PSlot, Mask, Source) 382
- WRITEIO PARAMETERS 382
- 9.3 File Control 383
- FILELIST PARAMETERS 384
- Enter FILEMANAGE PARAMETERS 384
- FileOpen 385
- Enter FILEOPEN PARAMETERS 385
- FileRead 386
- FILEREAD PARAMETERS 386
- FileReadLine 386
- FILEREADLINE PARAMETERS 386
- FileRename 387
- FILERENAME PARAMETERS 387
- FileSize 387
- FileTime 387
- FileWrite 388
- FILEWRITE PARAMETERS 388
- TableFile 388
- Enter TABLEFILE PARAMETERS 389
- DisplayMenu/EndMenu 393
- Variable 394
- SubMenu/EndSubMenu 395
- 11.1.1 Constant Strings 397
- 11.1.2 Add Strings 397
- Processing Instructions 398
- FORMATFLOAT PARAMETERS 400
- INSTR PARAMETERS 401
- LEFT PARAMETERS 401
- Len (SourceString) 401
- LowerCase (SourceString) 402
- LTrim (SourceString) 402
- Mid (String, Start, Length) 402
- MID PARAMETERS 402
- REPLACE PARAMETERS 403
- RIGHT PARAMETERS 403
- RTrim (SourceString) 403
- SPLITSTR PARAMETERS 404
- StrComp (String1, String2) 405
- Trim (SourceString) 405
- UpperCase (SourceString) 405
- Constants 407
- calibration 409
- Scan Rates 411
- Appendix D. Status Table 417
- Appendix E. Glossary 421
- E.2 Concepts 431
- CR9000X Index 433
- Definition, 4-15 436
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