Rockwell-automation 57C610 Enhanced Basic Language, AutoMax Manual de usuario Pagina 38
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- Tabla de contenidos
- MARCADORES
Valorado. / 5. Basado en revisión del cliente
5Ć6
D When a boolean value is combined with an integer value, the
boolean is always treated as the value zero (0) if it is FALSE and
one (1) if it is TRUE
.
The following statement illustrates these rules:
A% = SYSTEM
DOWN@*(SPEED_REFERENCE - 2.3376)
The value of this statement will be 0 if SYSTEM_DOWN@ is FALSE
or (SPEED_REFERENCE - 2.3376) if SYSTEM_DOWN@ is TRUE.
When a boolean operator is used to combine the two different data
types, it performs a bitĆwise or bitĆforĆbit operation on the two values,
treating the boolean as either an integer one (1) or zero (0):
LOWER_BYTE% = ANALOG_IN% AND OFFH
This operation will mask" off the upper 8 bits of the value
ANALOG_IN%, which can be useful when manipulating integers as
binary data.
5.4 Relational Expressions
It is often necessary in BASIC to compare different values and,
based on the result of that comparison, perform one of several
actions. These comparisons are done with relational operators and
are usually used in conjunction with the IF
ĆTHEN statement to create
conditional transfers or conditional executions of different parts of a
program. Table 5.4 lists the valid relational or comparison operators
and their meanings.
In forming relational expressions, similar data types must be
compared, i.e., numeric types must be compared to other numeric
types. It would be illegal to compare a boolean or integer
expression to a string expression using a relational operator.
Table 5.4 Ć Relational or Comparison Operators
Operator Example Meaning
=
A = B
A is equal to B
<
A < B
A is less than B
>
A > B
A is greater than B
< =
A < = B
A is less than or equal to B
> =
A > = B
A is greater than or equal to B
< >
A < > B
A is not equal to B
> <
A > < B
A is not equal to B
- r 1
- 1
- 1
- 1
- 1
- Table of Contents 3
- 6
- 7
- 1.0 INTRODUCTION 9
- 10
- 2.0 PROGRAMMING FOR 13
- AutoMax SYSTEMS 13
- 14
- 3.0 STRUCTURE OF AN 17
- AutoMax ENHANCED BASIC 17
- 18
- 19
- 4.0 VARIABLES AND 21
- CONSTANTS 21
- 26
- 28
- 29
- 30
- 30
- 31
- 5.0 EXPRESSIONS 33
- 35
- 36
- 5.4 Relational Expressions 38
- 39
- 6.0 AutoMax ENHANCED BASIC 41
- STATEMENT TYPES 41
- 43
- 43
- 44
- 6.3 Variable Assignment 46
- (LET/SET_MAGNITUDE) 46
- 6.4.1 GOTO (GO TO) Statement 47
- 49
- (Subroutines) 50
- 52
- 52
- 53
- 57
- 57
- 59
- 59
- 60
- 60
- 6.7 Real Time Enhancements 62
- 63
- 63
- 6.8.1 OPEN 64
- Statement 64
- 1514131211109 87 6543210 67
- FOR INPUT STATEMENTS 67
- 6.8.2 CLOSE 73
- 6.8.3 INPUT 73
- 6.8.4 PRINT/PRINT 75
- USING Statements 75
- 82
- 82
- 82
- 83
- 83
- 83
- 84
- 6.9 Error Handling 85
- 6.10 INCLUDE Statement 86
- 6.11 Stopping Execution 87
- (STOP and END Statements) 87
- 89
- 90
- 90
- 90
- 90
- 7.5 LN Function 91
- 7.6 EXP (e**x) Function 91
- 7.7 SQRT Function 91
- 7.8 ABS Function 91
- 7.9 CHR$ Function 91
- 92
- 92
- 92
- 7.13 BINARY$ Function 93
- 7.14 HEX$ Function 93
- 7.15 LEFT$ Function 93
- 7.16 RIGHT$ Function 94
- 7.17 MID$ Function 94
- 7.18 VAL% Function 94
- 7.19 VAL Function 95
- 7.20 FIX Function 95
- 7.21 CURPOS$ Function 95
- 96
- 96
- 97
- 7.25 BIT_SET@ Function 98
- 7.26 BIT_CLR@ Function 98
- 7.27 BIT_MODIFY@ Function 98
- 99
- 100
- 100
- 7.32 BCD_OUT% Function 101
- 7.33 BCD_IN% Function 101
- 7.31 ROTATER% Function 101
- 102
- 7.35 GATEWAY_CMD_OK@ Function 103
- 104
- 7.37 TEST_ERRLOG@ Function 105
- 7.38 READVAR% Function 105
- 106
- 7.40 FINDVAR! Function 107
- 7.41 CONVERT% Function 107
- 7.42 RTS_CONTROL@ Function 108
- 109
- 109
- 8.0 ETHERNET 111
- COMMUNICATION 111
- FUNCTIONS 111
- 8.2 SOCKET% Function 112
- 8.3 BIND% Function 112
- 113
- 114
- 115
- 116
- 117
- 118
- 8.10 SETSOCKOPT% Function 119
- 8.11 GETSOCKOPT% Function 120
- 8.12 SHUTDOWN% Function 121
- Appendix A 123
- Appendix B 125
- 126
- 127
- 127
- 127
- AIT, DELAY, EVENT Error Codes 128
- Channel I/O Error Codes 128
- Array Error Codes 128
- 131
- 132
- 135
- 136
- 136
- 136
- Appendix C 137
- 139
- 141
- Appendix F 143
- For additional information 146
- 1 Allen-Bradley Drive 146
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