Rockwell-automation 1771-DB BASIC MODULE Manual de usuario Pagina 176
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Chapter
Statements
1
1
11 -24
Use the ON-GOSUB statement to transfer control to the line(s) you
specified with the GOSUB statement (page 11 -13) when the value of the
expression following the ON statement is encountered in the BASIC
program.
All comments that apply to GOSUB apply to the ON statement. If the expr
after the ON is less than zero an
ERROR:
BAD ARGUMENT
message is
generated. If the expr after the ON is greater than the line number list
following the GOSUB statement, an
ERROR:
BAD SYNTAX
message is
generated. The ON-GOSUB statement provides conditional branching
options within the BASIC module program.
Important: Excessive nesting exceeds the limits of the control stack,
generating an error, and causing the module to enter Command mode.
For more information see control stack, page 8 -1.
Syntax
ON
expr
GOSUB
ln num, ln num,...ln num
Example
>
1 REM EXAMPLE PROGRAM
>10
ON Q GOSUB 100,200,300
If Q is equal to 0, control is transferred to line number 100. If Q is equal to
1, control is transferred to line number 200. If Q is equal to 2, control is
transferred to line number 300, and so on.
ON-GOSUB
- BASIC Module 1
- Allen-Bradley 1
- Important User Information 2
- EEPROM Programming Support 4
- Additional RAM Memory 4
- Five New LED Indicators 4
- Error-Trapping Support 5
- DH-485 Network Support 5
- Reset Switch Support 6
- Series B and 8
- 1746-BAS Compatibility 8
- Changes to the Manual 9
- Since the Last Printing 9
- Preface 10
- Summary of Changes 10
- Using This Manual 11
- How To Use This Manual 12
- Terms and Abbreviations 13
- Conventions 14
- Related Publications 14
- Getting Started 15
- Local Product Support 16
- Technical Product Assistance 16
- Allen-Bradley Support 16
- Table of Contents 17
- Chapter 1 17
- Chapter 2 17
- Chapter 3 17
- Chapter 4 17
- Chapter 5 18
- Chapter 6 18
- Chapter 7 18
- Chapter 8 18
- Expressions 19
- Operators 19
- Call Routines 0 - 68 21
- Call Routines 69-127 22
- Appendix A 24
- Appendix B 24
- Appendix C 24
- Appendix D 24
- Appendix E 24
- Installing the BASIC Module 25
- (Cat. No. 1771-DB) 26
- Configure the Jumpers 27
- Determine BASIC Module 34
- Placement 34
- Key the Backplane Connector 35
- Install the Module into the 36
- 1771 I/O Chassis 36
- Peripheral Devices 37
- Power up the Module 37
- Reset the Module 37
- Read the Indicator Lights 38
- Using the Communication Ports 39
- Communication 40
- DH485 Port 41
- Handshaking 42
- Hardware Handshaking 43
- Communication Rates 44
- Operating 45
- ASCII Port 46
- Program Port 47
- DF1 Protocol 48
- Network Port 49
- Chapter 53
- Remove the BASIC Module 54
- Disassemble the BASIC 55
- Install Optional Memory 56
- Install the Battery 60
- Screwdriver Slots 61
- Reassemble the BASIC 63
- Programming the BASIC Module 65
- Create a Program 66
- ASCII Terminal Emulator 67
- Number Program Lines 70
- Firmware Revision: A 71
- All rights reserved 71
- Programming Block-Transfers 75
- Output Image Table 76
- Data Tables 76
- Input Image Table 77
- Block-Transfer Buffers 78
- Block-Transfers and the 79
- Programming Block-T 80
- Family Processors 82
- Ladder Logic 82
- Asynchronous Block Transfer 84
- Synchronous Block Transfer 85
- Edit a Program Line 87
- Delete a Program Line 89
- Renumber a Program 89
- Debug a Program 90
- Using BASIC Module Statements 91
- Port Communication Calls 92
- Block-Transfer Support 93
- Number Conversion Calls 94
- Clock/Calendar Calls 94
- DH-485 Communication 95
- Background Operations 96
- Execution Control and 97
- Interrupt Support Calls 97
- Setup Calls 99
- What’s Next? 100
- Data Types 101
- String Data Types 102
- Numeric Data Types 103
- Backplane Conversion 104
- 16-Bit Binary (4 Hex Digits) 105
- 4-Digit, Signed, Octal 106
- What’s in This Chapter? 111
- Relational Expressions 111
- Constants 111
- Variables 112
- G arithmetic G functional 113
- G logical G logarithmic 113
- G relational G string 113
- Order of Operations 113
- Negation ( – ) 116
- Arithmetic Errors 116
- Bitwise Operators 117
- Relational Operators 119
- : 1.2626272 121
- Functional Operators 121
- Logarithmic Operators 123
- String Operators 124
- # and @ 127
- Special Function Operators 127
- Commands 131
- Backspace 137
- Examples 146
- Line Calls 152
- Statements 153
- rel expr 160
- DO-WHILE 161
- FOR-TO-(STEP)-NEXT 163
- IF-THEN-ELSE 167
- ON-GOSUB 176
- PH0. and PH1 179
- Call Routines 0 – 68 191
- CALL 0: Reset Module 192
- CALL 1: No Operation 192
- CALL 2: Timed Block 192
- Transfer-Read Buffer 192
- CALL 3: Timed Block 193
- Transfer-Write Buffer 193
- CALL 4: Set Block 194
- Transfer-Write Length 194
- CALL 5: Set Block 194
- Transfer-Read Length 194
- CALL 6: Block-Transfer 195
- Write Buffer 195
- CALL 7: Block-Transfer 195
- Read Buffer 195
- Input and Output Arguments 196
- Call Routines 0–68 197
- SLC 16-Bit Unsigned Integer 199
- 16: Enable/Disable 200
- DF1 Packet Interrupt 200
- CALL 17: 4-Digit BCD to 201
- BASIC Floating Point 201
- CALL 18: Re-Enable Control 201
- C Break Function 201
- BASIC Floating Point to 204
- 6-Digit, Signed, Fixed 204
- Decimal BCD 204
- BASIC Floating Point to SLC 205
- 16-Bit Signed Integer 205
- BASIC Floating-Point to SLC 206
- 16-Bit Binary 206
- CALL 30: PRT2 Port 210
- Support Parameter Set 210
- CALL 31: Display PRT2 Port 211
- Parameters 211
- 32: Enable/Disable 212
- Processor Interrupt 212
- CALL 33: Transfer Data from 213
- PRT1 or PRT2 to the 213
- BTR Buffer 213
- Sample Ladder Logic 218
- 35: Retrieve Numeric 224
- Input Character from PRT2 224
- CALL 36: Get the Number of 225
- Characters in the PRT2 Port 225
- CALL 37: Clear the PRT2 225
- Port Buffers 225
- CALL 38: Expanded ONERR 226
- CALL 39 : 3.3-Digit Signed 228
- BCD to BASIC Floating 228
- 40: Set the W 229
- Clock Time (Hour, Minute 229
- Second) 229
- 43: Retrieve 231
- Date/Time String 231
- CALL 44: Retrieve Date 231
- Numeric (Day, Month, Year) 231
- CALL 49: Read Remote 234
- DH-485 SLC Data File 234
- DH-485 SLC Data 240
- CALL 52: Retrieve Date 248
- CALL 53 – 59 248
- CALL 60: String Repeat 249
- CALL 61: String Append 250
- (Concatenation) 250
- CALL 62: Number to String 251
- Conversion 251
- CALL 63: String to Number 252
- CALL 64: Find a String 253
- 65: Replace a String 254
- CALL 66: Insert String in a 255
- CALL 67: Delete String 256
- CALL 68: Determine Length 257
- Call Routines 69–127 259
- CALL 70: ROM to RAM 260
- Program T 260
- CALL 71: ROM/RAM to ROM 261
- CALL 72: RAM/ROM Return 262
- CALL 73: Battery-Backed 263
- RAM Disable 263
- CALL 74: Battery-Backed 263
- RAM Enable 263
- CALL 75 – 76 263
- CALL 77: Protected Variable 264
- CALL 78: Set Program Port 266
- Communication Rate 266
- CALL 79: Set the Active 266
- LED Blinking State (No 266
- Operation) 266
- CALL 80: Check Battery 267
- Condition 267
- CALL 81: User PROM Check 268
- 82: Check User 269
- Memory Module Map 269
- CALL 83: Display DH485 269
- Port Parameters 269
- Common Interface File to 270
- BASIC Input Buffer 270
- Output Buffer to DH-485 271
- Common Interface File 271
- CALL 86: Check DH-485 272
- Interface File Remote Write 272
- CALL 87: Check DH-485 273
- Interface File Remote Read 273
- CALL 88: BASIC Floating 274
- Point to PLC-5 Floating 274
- CALL 89: PLC-5 Floating 275
- Point to BASIC Floating 275
- CALL 90: Read Remote 276
- DH-485 Data File to BASIC 276
- Input Buffer 276
- Output Argument One 278
- Output Buffer to Remote 280
- DH-485 Data File 280
- CALL 92: Read Remote 284
- DH-485 Common Interface 284
- File to BASIC Input Buffer 284
- remote device node address 286
- message time-out value 286
- Buffer to Remote DH-485 287
- CALL 94: Display Current 290
- PRT1 Port Setup 290
- CALL 95: Get Number of 290
- Characters in PRT1 Buffers 290
- 96: Clear PRT1 291
- Receive/Transmit Buffers 291
- CALL 97: Enable Port PRT2 291
- DTR Signal 291
- CALL 98: Disable Port PRT2 292
- CALL 99: Reset Print Head 292
- CALL 103: Print PRT1 294
- Transmit Buffer and Pointer 294
- CALL 104: Print PRT1 295
- Receive Buffer and Pointer 295
- CALL 105: Reset PRT1 to 295
- Default Settings 295
- 106 – 107 296
- CALL 108: Enable DF1 296
- Driver Communications 296
- CALL 109: Print the 302
- Argument Stack 302
- 10: Print the PRT2 303
- Port Transmit Buffer and 303
- 11: Print the PRT2 304
- Port Receive Buffer and 304
- 14: Transmit DF1 306
- 15: Check DF1 307
- 16: Call User 308
- Defined Assembly Language 308
- 17: Get DF1 Packet 309
- 18: PLC/SLC 310
- Unsolicited Writes 310
- 19: Reset the PRT2 314
- Port to Default Settings 314
- CALL 120: Clear BASIC 315
- Module I/O Buffers 315
- CALL 121 315
- CALL 122: Read Remote 316
- DF1 PLC Data File 316
- 123: W 324
- 124–127 332
- Product Overview 333
- Hardware Features 334
- Software Features 335
- Diagnostic Features 336
- ASCII Terminal Interface 337
- Programming Interfaces 337
- BASIC Development Software 338
- Network Configurations 339
- Product Overview 340
- Appendix 340
- DF1 Protocol Configuration 341
- Memory Requirements 342
- Keying Clips 343
- Connector 343
- .99999999E 344
- Related Products 345
- Conversion Table 347
- Troubleshooting 349
- Error Messages from BASIC 350
- Error Messages from CALL 352
- Routines 352
- Series A Configuration Plugs 355
- Quick Reference 357
- See also BTR buffer 365
- See also BTW buffer 365
- BUSINESS REPLY MAIL 392
- Supersedes 394
- Copyright 394
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