Rockwell-automation 1771-DB Basic Module User Manual - Series A User Manual Page 166
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Appendix C
Basic Module Programming Hints
These programming hints can help you to properly program your module
to increase module performance.
1. Always define strings first.
2. Always dimension arrays after defining strings.
3. Define
the most
used variables first. Y
ou can use 0 values until you assign
real values.
4. When doing math, save intermediate values rather than recalculate.
5. Place the most used subroutines near the beginning of the program.
6. Straight through code executes faster, but uses more memory.
7. Put
multiple statements
on a line, after the program has been debugged.
8.
Comments use space and slow program execution. After the program is
debugged save a fully commented copy on tape or spare ERROM and
remove comments.
BASIC Module
Programming Hints
- 1771–DB Basic 1
- Allen-Bradley 1
- Table of Contents 2
- Table of Contents iii 4
- Table of Contentsiv 5
- Table of Contents v 6
- Table of Contents vii 8
- Using This Manual 9
- Important information 10
- Conventions 10
- Introducing the BASIC Module 11
- General Features (continued) 12
- Hardware Features 12
- Software Features 13
- 2.5 Specifications 14
- Installing the BASIC Module 15
- Chapter 3 16
- Module Keying 17
- Configuration Plugs 17
- Module Installation 19
- Initial Start-up Procedure 19
- Module Status LED’s 20
- Installing the User Prom 21
- Electrostatic 23
- Discharge 23
- Battery (continued) 24
- Using the Serial Ports 25
- Chapter 4 26
- Program Port 27
- Connecting a T3/T4 Industrial 29
- Terminal to the Program Port 29
- Configuring the Software 31
- Peripheral Port 32
- Connecting A T30 Industrial 34
- Terminal (1784-T30) to the 34
- Peripheral Port (continued) 34
- Connecting 36
- RS-422 Devices 36
- Assembly Parts 37
- Argument 42
- Control Stack 42
- Description of Commands 43
- Command: RUN 43
- Command: CONT 44
- Command: LIST 44
- Command: LIST# or LIST 45
- Command: Disabling Control C 46
- Commands: RAM and ROM 48
- [integer] (continued) 48
- Command: XFER 49
- Command: PROG 49
- Command: PROG1 51
- Command: PROG2 51
- Statement: CLEARS 54
- Statements: CLOCK1 54
- READ – RESTORE 55
- Statements: DAT 55
- Statement: DIM 56
- Statements: DO – UNTIL 56
- [rel expr] 56
- [rel expr] (continued) 57
- Statements: DO – WHILE 58
- Statements: GOSUB [ln num] 61
- – RETURN (continued) 61
- Statement: GOTO [ln num] 61
- Statements: IF – THEN – 63
- ELSE (continued) 63
- Statement: INPUT 63
- Statement: LD@ [expr] 65
- Statement: LET 66
- Statement: ONERR 67
- [ln num) 67
- Statement: ONTIME 68
- [expr],[ln num] 68
- [expr], [ln num] (continued) 69
- Statement: PRINT or P 69
- Special Print Formatting 70
- Statements 70
- Statements (continued) 71
- Statement: PRINT# or P.# 73
- Statements: 74
- PH0., PH1. 74
- PH0.#, PH1.# 74
- Statement: PUSH[expr] 75
- Statement: POP[var] 76
- Statement: REM 77
- Statement: STOP 79
- Statement: STRING 79
- Dual Operand (dyadic) 81
- Operators (continued) 81
- Unary Operators 82
- Relational Expressions 86
- Special Operators 87
- Special Function Operators 87
- System Control Values 89
- Data Transfer Support 89
- Routines 89
- Enable Interrupts – CALL 9 92
- Input Call Conversion 92
- Output Call Conversion 94
- Routines (continued) 94
- Peripheral Port Support 96
- Peripheral Port Support – 96
- Parameter Set – CALL 30 96
- Get Numeric Input 100
- Character from Peripheral 100
- Port – CALL 35 100
- Port – CALL 35 (continued) 101
- Chapter 5 102
- Operating Functions 102
- The ASC Operator 109
- (continued) 110
- The CHR Operator 111
- String Support Calls 112
- 5.10.3.9 124
- Reset the Peripheral Port 132
- CALL 119 132
- Programming 133
- Chapter 6 134
- PLC-2 Processor Program 135
- PLC-3 Family Processors 137
- PLC-5 Family Processors 140
- Programming Tips 142
- Data Types 143
- 6-digit, Signed 146
- Fixed Decimal BCD 146
- 3.3-digit, Signed 147
- Input Data Types 148
- Editing A Procedure 149
- Editing 150
- Procedure 150
- Chapter 8 150
- Renumber (continued) 151
- Editing a Simple 152
- Procedure 152
- Error Messages and Anomalies 153
- Error Messages from 154
- BASIC (continued) 154
- Error Messages and 155
- Anomalies 155
- Chapter 9 155
- String Support CALL 157
- Error Messages 157
- Anomalies (continued) 160
- Quick Reference Guide 162
- Appendix 163
- Conversion Table 164
- BASIC Module 166
- Programming Hints 166
- Worldwide representation 167
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