Rockwell-automation 2708-NBD VBASIC Language Development Kit Manual de usuario descargar pdf (Pagina 81)

Appendix D

A-B BASIC Limits

D–2

When compiling programs with the LXBC command, the statistics in the

LST listing file show the percent of total compiler capacity used. Maximums

can be calculated from the percentages shown.

How to compute memory size required for any application:

Interpreter overhead 6.3K. . . . . . . . . . . . . . .

Program running 13.7K. . . . . . . . . . . . . . . . . .

# of CHAINed programs * 13.7K = ??.? K. . .

# of host records/hour

* Hours offline * bytes/rec = ??.? K. . . . . . .

# of RAM file records for

lookup tables, etc. * bytes/rec = ??.? K

. . . . .

Total RAM Required = Sum of the above values

1 2 ... 76 77 78 79 80 81 82 83 84

User Manual 1
Important User Information 2
Chapter 1 3
Chapter 2 3
Chapter 3 3
Special Devices 4
Chapter 5 5
Appendix B 5
Bulletin 2708 6
Table of Contents 6
Application Library 7
Subroutines 7
A-B VBASIC Limits 8
Introduction to BASIC 9
What is Visual BASIC ? 10
What is A-B VBASIC? 11
Developing and Running 12
The A-B VBASIC 13
Development Procedure 13
(cont’d) 13
Loading and Auto-Starting 14
Start-up Condition of 14
Termination of an 15
A-B VBASIC Program 15
A-B VBASIC 16
Run-Time Errors 16
Power Failure 17
CROSS-COMPILER (LXB) 18
Invoking the Compiler 19
Special Devices in A-B VBASIC 22
Introduction (cont’d) 23
Device: LCD Display 23
Device: Keypad 24
Device: Barcode Scanners 25
Device: Host Computer 27
Chapter 4 30
IF LOC(#1) 0 THEN 31
LINE INPUT #1, INLINE$ 31
‘ Do something else 31
Devices: Communication 32
Ports, Primary and 32
Auxiliary 32
Auxiliary (cont’d) 33
Device: RAM Files 34
Device: RAM Files (cont’d) 35
Device: Beeper 35
Device: Front Panel LEDs 35
Device: The #9 36
User Status Display 36
Device: The Egg Timer 37
Introduction 38
Using the Library 39
Using the Library (cont’d) 40
Writing Programs 40
Using the ENVPC Simulator 41
Appendix 47
Appendix A 48
Differences Between 49
A-B VBASIC and Visual BASIC 49
Supported A-B VBASIC 50
Keywords 50
CLOSE #1 51
EOF(filenumber) 54
GOTO {linelabel/linenumber} 57
HEX$(expression) 57
IF...THEN...ELSE 57
INT(numeric–expression) 58
IOCTL$([#]filenumber) 58
IOCTL[#]filenumber,string 58
KILL “filespec” 58
LOF(filenumber) 60
LTRIM$(stringexpression) 60
MKD$, MKI$, MKL$, MKS$ 60
RANDOMIZE expression 62
REM remark 62
‘ remark 62
SGN(numeric–expression) 64
SLEEP seconds 64
SOUND frequency,duration 64
SWAP vari1,vari2 66
TIME$ = stringexpression 66
OpenLINX 70
SUB OpenLINX 70
Appendix C 71
Appendix D 81
A-B BASIC Limits 81
ALLEN-BRADLEY 84

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