Rockwell-automation AutoMax Enhanced Ladder Language Reference Manual Manual de usuario Pagina 304
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DĆ2
D.1 Using the PreĆDefined Program Scan Variables
Use the following Boolean variables to execute logic based on the Processor's scan.
Only use these variables for input parameters (read only):
D first_scan
Use this variable to execute logic during a program's first scan. This variable is
true during the initial scan of the ladder rung and false during all other scans.
D second_scan Use this variable to execute logic during a program's second scan. This
variable is true during the second scan of the ladder rung and false during all
others.
D last_scan Use this variable to execute logic during a program's last scan. This variable is
true on the final pass of the ladder rung after you have selected TASK STOP.
This variable is not set when a STOPĆALL error occurs.
To use the last_scan variable, your program scan must be less than 0.5 s.
I
MPORTANT:
Do not use the last_scan variable in an eventĆdriven program. Because these
programs are based on the occurrence of an event, the last_scan variable may
never be executed when used in an eventĆdriven program.
- 1
- 17
- 1.5 Using Transition Contacts 22
- Construct 27
- 1.6 Always True Contact (ATI) 28
- 1.8 Coil (CO) 30
- 1.9 Set (Latch) Coil (SCO) 31
- 35
- 36
- 37
- 38
- 39
- Using Ladder Logic 40
- 41
- 42
- 43
- 44
- 3.1.2 Output 45
- 46
- 3.2 Timer Off Delay (TOF) 47
- 3.2.1 Input 48
- 3.2.2 Output 49
- 50
- 3.3 Timer On Delay (TON) 51
- 52
- 53
- 54
- 3.4 Timer Pulse (TP) 55
- 3.4.1 Input 56
- 3.4.2 Output 57
- 58
- 61
- 62
- 4.1.1 Input 63
- 4.1.2 Output 64
- 4.2.1 Input 67
- 4.2.2 Output 68
- 70
- 4.3.1 Input 71
- 4.3.2 Output 72
- 4.4.1 Input 75
- 4.4.2 Output 76
- 78
- 4.5.1 Input 79
- 4.5.2 Output 80
- 4.6 Limit (LIMIT) 82
- 4.6.1 Input 83
- 4.6.2 Output 84
- 4.7 Mask Compare (MSK) 86
- 4.7.1 Input 87
- 4.7.2 Output 88
- 90
- 4.8.1 Input 91
- 4.8.2 Output 92
- 95
- 5.1 Absolute Value (ABS) 96
- 5.1.1 Input 97
- 5.1.2 Output 98
- 99
- 5.2.1 Input 100
- 5.2.2 Output 101
- 103
- 5.3.1 Input 104
- 5.3.2 Output 105
- 5.4 Modulo (MOD) 106
- 5.4.1 Input 107
- 5.4.2 Output 108
- 5.5 Multiply (MUL) 109
- 5.5.1 Input 110
- 5.5.2 Output 111
- 5.6 Multiply Divide (MDV) 113
- 5.6.1 Input 114
- 5.6.2 Output 115
- 5.7 Negate (NEG) 116
- 5.7.1 Input 117
- 5.7.2 Output 118
- 5.8 Square Root (SQRT) 119
- 5.8.1 Input 120
- 5.8.2 Output 121
- 5.9 Subtract (SUB) 122
- 5.9.1 Input 123
- 5.9.2 Output 124
- 5.10.4 Errors 128
- Instruction 128
- 133
- 6.1 Logical And (AND) 134
- 6.2 Logical Not (NOT) 137
- 6.3 Logical Or (OR) 140
- result 142
- 148
- 7.1.1 Input 149
- 7.1.2 Output 150
- result 151
- 7.2.1 Input 153
- 7.2.2 Output 154
- 159
- 8.1.1 Input 161
- 8.1.2 Output 162
- 8.2.1 Input 165
- 8.2.2 Output 166
- 168
- 8.3.1 Input 169
- 8.3.2 Output 170
- result 171
- 177
- 9.1.1 Input 178
- 9.1.2 Output 179
- 9.2.1 Input 182
- 9.2.2 Output 183
- 9.3.1 Input 186
- 9.3.2 Output 187
- 189
- 9.4.1 Input 190
- 9.4.2 Output 191
- 9.5.1 Input 194
- 9.5.2 Output 195
- 9.6.1 Input 198
- 9.6.2 Output 199
- 203
- 208
- 10.1.2 Output 211
- 10.1.4 Input 216
- 10.2.2 Output 220
- 222
- 10.3.1 Input 224
- 10.3.2 Output 228
- 230
- 10.4.1 Input 231
- 10.4.2 Output 232
- 234
- 10.5.1 Input 235
- 10.5.2 Output 236
- Input Conditions 238
- 245
- 11.1 Set Event (SET) 246
- 247
- 249
- 249
- 254
- 255
- 257
- 260
- 261
- 262
- I/O Write Instructions 266
- 267
- 268
- 13.1.1 Input 269
- 13.1.2 Output 270
- 13.2 Immediate Output (OUT) 271
- 13.2.2 Output 272
- 273
- A.1 Data Types 275
- and Double Integer V 276
- A.1.2 Integer 276
- A.1.3 Timer Variables 278
- MPORTANT: 279
- A.1.4 Counter Variables 280
- A.1.5 Labels 281
- ElementĆIndexing 282
- A.3.1 Local Variables 283
- A.3.2 Global Variables 284
- A.4 Arrays 285
- A.5 Constants 287
- A.6.2 About 290
- A.6.3 About the Retained V 290
- ((!& #, 297
- ((!& #- 299
- 303
- 306
- 307
- E.1 Error Codes 3001Ć3010 308
- E.2 Error Codes 3011Ć3020 309
- E.3 Error Codes 3021Ć3030 310
- E.4 Error Codes 3031Ć3035 311
- " 313
- 314
- 314
- ! 325
- 326
- 335
- For additional information 352
- 1 Allen-Bradley Drive 352
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