Rockwell-automation 1747-PBASE BASIC Development Software Programming Uživatelský manuál Strana 79
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Hodnocené. / 5. Na základě hodnocení zákazníků
Publication 1746-PM001A-US-P
Writing Programs Using the BASIC Development Language 6-7
Breakpoint
The Breakpoint directive inserts a STOP statement into the program when it is
translated. The STOP statement is inserted only if the Debug directive is turned on
{$D+}. When downloaded to the module and executed, program execution halts
when the STOP is encountered. Entering the command CONT (for CONTinue)
resumes execution from where it stopped.
Breakpoints can be used as debugging aids or to allow you to display or modify
variables.
Syntax:
{$B}
Example:
Refer to the example for Debug.
Debug on
Debug off
When the Debug directive is programmed on {$D+}, STOP statements are inserted
at all the Breakpoints {$B} during program translation. {$D+} inserted anywhere in
the program turns Debug on until {$D–} is encountered. The default is for Debug
to be turned off {$D–}.
Syntax:
{$D+} to turn debug on
{$D–} to turn debug off
Example:
Before translation: After translation:
REM DEBUGGING 0 REM ...
{$B} 10 REM DEBUGGING
{$D+} 20 IF A>C THEN GOTO 50
IF A>C THEN GOTO GET_C_VALUE 30 STOP
{$B} 40 A=55
A=55 50 STOP
{$L GET_C_VALUE} 60 C=107
{$B}
C=107
In the preceding example, the first breakpoint is not translated to a STOP. This is
because Debug has not been turned on at that point.
IMPORTANT
The Debug directive is not related to the Terminal mode
debugger in any way. In fact, if you use the Terminal mode
debugger (described in Chapter 9), you should not use the Debug
directive or the Breakpoint directive. The Debug and Breakpoint
directives are useful for debugging programs from Terminal mode
without using the Terminal mode debugger.
- BASIC Development 1
- Software 1
- Important User 2
- Information 2
- Table of Contents 3
- Table of Contents ii 4
- Table of Contents iii 5
- Chapter 9 6
- Communicating with the 6
- Appendix A 6
- Appendix B 7
- Table of Contents vi 8
- Who Should Use This 9
- Purpose of this Manual 10
- Related Documentation 11
- Terms and Abbreviations 12
- Conventions Used in this 13
- Rockwell Automation 13
- P-6 14
- Installing the Software 15
- Hardware Requirements 16
- Installation Procedure 17
- Directory Structure 19
- Backing-up Your 20
- Toplevel Menu 22
- Main Menu 22
- Status Line 23
- Message Line 24
- Function Keys 24
- Using Help Outside a Program 24
- Using Help Within a Program 25
- Typical Pull-down Menu 25
- Navigating Within Windows 26
- Figure 2.3 Window Labels 27
- Editing a BASIC Program 29
- Saving Your Program 30
- Translating Your Program 31
- Changing to Terminal Mode 32
- Exiting a BASIC Program 33
- Configuring Your Software 35
- Command Line Switches 36
- Configuring Your Edit 38
- Configuring Display 41
- Configuring Mouse and 41
- Keyboard Options 41
- Configuring Your 42
- Filename Extensions 42
- ↓ 43
- Configuring Your Printer 45
- Memory Options 45
- Backup Files, Temporary 46
- Files, and Autosave 46
- Search and Replace 47
- Defaults 47
- Terminal Emulation 47
- Mode Selection 47
- Save Configuration and 48
- Editing a Program 49
- Searching Operations 50
- Using Block Operations 51
- Figure 4.2 Block Menu 52
- Text Formatting, Undo 54
- Advanced Editing 55
- Techniques 55
- Drawing Lines 56
- Using the Calculator 57
- The ASCII Table 57
- Using Windows 57
- Using Keystroke Macros 59
- • [F] selects the File menu 60
- Changing Recorded Keystrokes 61
- Editing Keystroke Macros 62
- Using Cursor Markers 63
- 4-16 Editing a Program 64
- [Alt-F3] 64
- [Shift-F3] 64
- [Alt-F8] 64
- Manipulating Files 65
- Selecting Project Files 66
- Figure 5.2 User Menu 67
- User-defined Programs 68
- Name Selection 69
- Selecting a Filename 69
- Swap Method Selection 69
- Memory Required Selection 70
- Use COMMAND.COM Option 71
- Starting Directory 71
- 5-8 Manipulating Files 72
- Language 73
- Translator Directives 74
- Line Number 78
- Increment 78
- Breakpoint 79
- Debug on 79
- Debug off 79
- Creating Your Own 80
- Programming Macro 80
- Bringing in Programs 81
- Subprogram CALL 70, CALL 71 82
- Programming Macros 82
- Merging a Program File 82
- Creating a Second 83
- Translating 85
- Figure 6.1 86
- Downloading 87
- Executing 87
- Printing Your Program 89
- Printer Selection 90
- Printer Setup 91
- Printer Device/File 91
- Serial Printers 92
- Using the Printer 93
- Controls 93
- Printing All or Part of a 94
- Document 94
- Eliminating Translator 98
- Translator Configuration 98
- ↑ Ins 175k 06-12-91 1:15pm 99
- Publication 1746-PM001A-US-P 100
- Communicating with the Module 101
- Downloading File 103
- Uploading File 104
- ↓> 105
- ↑↓→← to Edit 105
- Hex File Transfers 106
- Downloading Hex Files 107
- Backing Up the Module Image 108
- Debugging Your 109
- Debugging Example 111
- Figure 9.3 Watch Window 112
- RS-232 Communications 114
- Autobaud 115
- General Setup Parameters 116
- Terminal 116
- Com Port Settings 116
- Save Setup 117
- DH485 Communications 118
- Who Active 121
- Who Listen 122
- BASIC Macro Library 123
- Screen Functions 124
- Keyboard Functions 125
- SLC Backplane 126
- Functions 126
- Clock Functions 127
- Battery Back-Up 128
- Program Control 128
- String Routines 129
- [CTRL-C] Functions 130
- Port Control Functions 130
- DH485 Functions 130
- 1771-DB/B Backplane 131
- The DOS Directory Shell 133
- 2 Index 138
- Index 3 139
- 4 Index 140
- Index 5 141
- 6 Index 142
- Back Cover 144
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