Rockwell-automation 1746-BAS BASIC LANGUAGE User Manual Page 87
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Publication 1746-RM001A-US-P
Control Functions 7-3
DO-WHILE
Purpose
Use the DO-WHILE statement to set up loop control within a module program.
The operation of this statement is similar to the DO-UNTIL [rel expr]. All
statements between the DO and the WHILE [rel expr] are executed as long as the
relational expression following the WHILE statement is true. You can nest
DO-WHILE statements.
The control stack (C-stack) stores all information associated with loop control
(example: DO-WHILE, DO-UNTIL, FOR-NEXT and BASIC subroutines). The
control stack is 157 bytes long. DO-WHILE and DO-UNTIL loops and GOSUB
commands use 3 bytes of the control stack. FOR-NEXT loops use 17 bytes.
Syntax
DO-WHILE [rel expr]
Examples
Simple DO-WHILE
>NEW
>1 REM EXAMPLE PROGRAM
>10 DO
>20A=A+1
>30 PRINT A
>40 WHILEA<4
>50 PRINT “DONE”
>60 END
READY
>RUN
1
2
3
4
DONE
READY
>
Nested DO-WHILE
>NEW
IMPORTANT
Excessive nesting exceeds the limits of the control stack,
generating an error, and causing the module to enter Command
mode.
- BASIC Language 1
- Important User 2
- Information 2
- Table of Contents 3
- Table of Contents ii 4
- Table of Contents iii 5
- Chapter 11 6
- Chapter 12 6
- Table of Contents v 7
- Table of Contents vi 8
- Who Should Use This 9
- Purpose of this Manual 10
- How to Use this Manual 11
- Terms and Abbreviations 12
- Conventions Used in this 12
- Rockwell Automation 13
- P-6 14
- Language Elements 15
- BASIC Line Length 16
- Data Types 17
- Example 1 18
- Example 2 18
- Example 3 18
- Numeric Data Types 19
- Variables 20
- Variable Names 21
- Variable Types 21
- 2-6 Data Types 22
- Expressions and Operators 23
- Expressions and 24
- Operators 24
- Hierarchy of Operators 25
- Arithmetic Operators 25
- Divide ( / ) 26
- Exponentiation ( **) 26
- Multiply ( * ) 26
- Subtract ( - ) 26
- Negation ( - ) 26
- Overflow and Division by Zero 27
- Logical Operators 28
- Relational Operators 29
- Trigonometric Operators 30
- Functional Operators 31
- INT([expr]) 32
- SGN([expr]) 32
- SQR([expr]) 32
- Logarithmic Operators 33
- String Operators 34
- CHR([expr]) 36
- Special Function 37
- CBY([expr]) 38
- DBY([expr]) 38
- XBY([expr]) 39
- BASIC Commands 41
- Control-C 44
- CALL 18 – Re-enable the 45
- Control-C Break 45
- Function 45
- CALL 19 – Disable the 46
- Control-S 47
- Control-Q 48
- 4-12 BASIC Commands 52
- BASIC Commands 4-13 53
- 4-16 BASIC Commands 56
- >PROG1 56
- BASIC Commands 4-17 57
- >PROG2 57
- Variations 63
- 4-26 BASIC Commands 66
- >XFER 66
- Command Line CALLs 67
- CALL 74 – 68
- Battery-Backed RAM 68
- CALL 77 – Protected 68
- Variable Storage 68
- CALL 81 – User Memory 69
- Module Check and 69
- Description 69
- CALL 82 – Check User 70
- Memory Module Map 70
- CALL 101 – Upload User 70
- Memory Module Code to 70
- CALL 103 – Print PRT1 71
- Output Buffer and 71
- CALL 104 – Print PRT1 72
- Input Buffer and Pointer 72
- CALL 109 – Print 73
- Argument Stack 73
- CALL 110 – Print PRT2 74
- Output Buffer Pointer 74
- CALL 111 – Print PRT2 74
- Input Buffer Pointer 74
- Command Line CALLs 5-9 75
- >CALL 111 75
- PRT2 Input Queue 75
- Assignment Functions 77
- Control Functions 85
- DO-WHILE 87
- DO-UNTIL 88
- FOR-TO-(STEP)-NEXT 90
- IF-THEN-ELSE 92
- 7-12 Control Functions 96
- Functions 97
- CALL 16 – Enable DF1 98
- Packet Interrupt 98
- CALL 17 – Disable DF1 99
- CALL 20 – Enable 99
- CALL 21 – Disable 100
- Processor Interrupt 100
- CALL 26 – Module 100
- Interrupt 100
- CALL 38 – Expanded 101
- ONERR Restart 101
- Publication 1746-RM001A-US-P 102
- PUSH [0 or 1] 103
- CALL 70 – ROM to RAM 104
- Program Transfer 104
- CALL 71 – ROM/RAM to 105
- ROM Program Transfer 105
- CALL 72 – RAM/ROM 105
- Program in ROM 1 106
- Program in ROM 3 106
- With ROM 1 selected: 106
- Examples 107
- ON-GOSUB 110
- CALL 14 – 16-Bit Signed 117
- Integer to BASIC 117
- Floating-Point 117
- CALL 25 – BASIC 119
- Floating-Point to 16-Bit 119
- CALL 88: BASIC 120
- Floating-Point to SLC 120
- CALL 89: SLC 121
- Floating-Point to BASIC 121
- POP converted value 122
- IMPORTANT 122
- Clock/Calendar Functions 123
- CALL 41 – Set Clock/ 124
- Calendar Date 124
- CALL 42 – Set Day of 125
- CALL 43 – Retrieve Date/ 126
- Time String 126
- CALL 44 – Retrieve Date 126
- CALL 45 – Retrieve Time 127
- CALL 46 – Retrieve Time 128
- CALL 47 – Retrieve Day 128
- CALL 48 – Retrieve Day 129
- CALL 52 – Retrieve Date 129
- PUSH [string number] 130
- Status Functions 131
- CALL 36 – Get Number of 132
- Characters in PRT2 132
- CALL 51 – Check CPU 133
- Output Image Buffer 133
- CALL 55 – Check CPU 134
- Input Image Buffer 134
- CALL 58 – Check M0 File 135
- CALL 59 – Check M1 File 136
- CALL 75 – Check SLC 500 137
- Controller CPU Status 137
- CALL 80 – Check Battery 138
- Condition 138
- CALL 86 – Check DH485 138
- Interface File Remote 138
- Write Status 138
- CALL 87 – Check DH485 139
- Read Status 139
- CALL 95 – Get Number of 140
- Characters in PRT1 140
- Buffers 140
- CALL 97 – Enable Port 141
- PRT2 DTR Signal 141
- CALL 98 – Disable Port 141
- CALL 108 – Enable DF1 142
- Driver Communications 142
- Status Functions 11-13 143
- 11-14 Status Functions 144
- Status Functions 11-15 145
- Full-Duplex Modem (FDM) 146
- Status Functions 11-17 147
- CALL 113 – Disable DF1 148
- CALL 120 – Clear module 148
- Input and Output Buffers 148
- CALL 121 – Get SLC 149
- Processor Program ID 149
- CALL 121 150
- POP [program ID number] 150
- Output Functions 151
- CALL 23 – Transfer Data 152
- Port 1 or 2 152
- 12-4 Output Functions 154
- Output Functions 12-5 155
- CALL 28 – Write to 156
- Remote DH485 SLC Data 156
- • 2 - SLC Typed Write 158
- • 0 - CPU output image file 159
- • 1 - CPU M0 file 159
- • 2 - Internal string 159
- handshaking 160
- >1 REM EXAMPLE PROGRAM 161
- CALL 29 – Read/Write to 163
- Module Internal String 163
- CALL 31 – Display 164
- Current PRT2 Port Setup 164
- CALL 37 – Clear PRT2 165
- Input/Output Buffers 165
- CALL 54 – Transfer 165
- BASIC Output Buffer to 165
- CPU Input Image 165
- CALL 57 – Transfer 166
- CPU M1 File 166
- CALL 85 – Transfer 167
- DH485 Common 167
- Interface File 167
- CALL 91 – Write BASIC 168
- Output Buffer to Remote 168
- DH485 Data File 168
- Output Functions 12-19 169
- 12-20 Output Functions 170
- CALL 93 – Write Output 172
- Buffer to Remote DH485 172
- Common Interface File 172
- Output Functions 12-23 173
- CALL 94 – Display 174
- Current PRT1 Port Setup 174
- CALL 96 – Clear PRT1 174
- CALL 112 – User LED 175
- CALL 114 – Transmit DF1 176
- CALL 115 – Check DF1 177
- XMIT Status 177
- CALL 123 – Write to 178
- Remote DF1 PLC Data 178
- on the PLC-2 180
- Output Functions 12-31 181
- 12-32 Output Functions 182
- Output Functions 12-33 183
- PH0., PH1 187
- 12-40 Output Functions 190
- Input Functions 191
- CALL 22 – Transfer Data 192
- CPU Files 192
- Input Functions 13-5 195
- 13-6 Input Functions 196
- CALL 27 – Read Remote 198
- DH485 SLC Data File 198
- • 2 - SLC Typed Read 200
- Input Functions 13-11 201
- • 0 – Successful completion 204
- CALL 35 – Get Numeric 205
- Input Character from 205
- CALL 53 – Transfer CPU 207
- Output Image to BASIC 207
- Input Buffer 207
- CALL 56 – Transfer CPU 208
- M0 File to BASIC Input 208
- CALL 84 – Transfer 209
- DH485 Interface File to 209
- BASIC Input Buffer 209
- CALL 90 – Read Remote 210
- DH485 Data File to 210
- Input Functions 13-21 211
- (x2) of remote device file] 212
- CALL 92 – Read Remote 213
- Interface File to BASIC 213
- CALL 117 – Get DF1 215
- Packet Length 215
- CALL 118 – PLC/SLC 216
- Unsolicited Writes 216
- 13-28 Input Functions 218
- Input Functions 13-29 219
- CALL 122 – Read Remote 220
- DF1 PLC Data File 220
- Input Functions 13-33 223
- • 0 – CPU input image file 224
- • 1 – CPU M1 file 224
- • 2 – Internal string 224
- Input Functions 13-35 225
- 13-36 Input Functions 226
- 13-46 Input Functions 236
- Setup Functions 237
- CALL 78 – Set Program 238
- Port Baud Rate 238
- CALL 99 – Reset Print 239
- Head Pointer 239
- CALL 105 – Reset PRT1 to 240
- Default Settings 240
- CALL 119 – Reset PRT2 to 240
- Setup Functions 14-5 241
- String Functions 243
- CALL 61 – String Append 244
- CALL 62 – Number to 245
- String Conversion 245
- CALL 63 – String to 246
- Number Conversion 246
- CALL 64 – Find a String 248
- CALL 65 – Replace a 249
- String in a String 249
- CALL 66 – Insert a String 250
- CALL 67 – Delete a 251
- CALL 68 – Find the 252
- Length of a String 252
- String Functions 15-11 253
- ERROR: MEMORY 253
- Conversion Table 255
- Reference Guide 257
- within destination file] 258
- within source file] 258
- [CTRL-C].*4-3 263
- [CTRL-S].4-8 263
- Index iii 269
- Index v 271
- Index vii 273
- Index ix 275
- Index xi 277
- Back Cover 280
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