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6-12
Ladder Logic (LAD) for S7-300 and S7-400
C79000-G7076-C504-02
6.3 Significance of the CPU Registers in Instructions
Registers help the CPU perform logic, math, shift, or conversion operations.
These registers are described below.
The two 32-bit accumulators are general purpose registers that you use to
process bytes, words, and double-words.
0781516232431
Accumulator (1 or 2)
Low wordHigh word
Low byteHigh byteLow byteHigh byte
Figure 6-5 Areas of an Accumulator
The status word contains bits that you can reference in the address of bit
logic instructions. The sections that follow the figure explain the significance
of bits 0 through 8.
2
8
2
15
... ...2
9
2
4
2
7
2
6
2
5
2
0
2
3
2
2
2
1
BR OSCC 1 CC 0 OV FCOR STA RLO
Figure 6-6 Structure of the Status Word
Value Meaning
0 Sets the signal state to 0
1 Sets the signal state to 1
x Changes the state
– State remains unchanged
Explanation
Accumulators
Status Word
Changing of the
Bits in the Status
Word
Configuration and Elements of Ladder Logic
- Ladder Logic (LAD) 1
- Programming 1
- Editor 6
- Contents 10
- C79000-G7076-C504-02 14
- Product Overview 15
- Introduction 17
- S Organization blocks (OBs) 20
- S Function blocks (FBs) 20
- S Functions (FCs) 20
- S Data blocks (DBs) 20
- 2.3 Rules to Observe 23
- Creating Logic Blocks 25
- (optional) 38
- S Comparison boxes 39
- S Midline outputs (#) 39
- 3.9 Entering Ladder Elements 42
- 3.12 Symbolic Addressing 48
- Data Types 53
- 4.2 Selecting a Method 56
- TAB or RETURN keys. At 57
- DB17 - <Offline> 58
- Figure 4-6 Declaring a UDT 61
- Insert 61
- S Select File 64
- STL. You must then convert 66
- FB6-<Online> 70
- 6.1 Elements and Boxes 76
- CPU manual 79
- Addressing 93
- 7.1 Overview 94
- 7.2 Types of Addresses 96
- 8.1 Overview 100
- 8.2 Normally Open Contact 101
- 8.3 Normally Closed Contact 102
- 8.4 Output Coil 103
- 8.5 Midline Output 104
- 8.6 Invert Power Flow 105
- 8.7 Save RLO to BR Memory 106
- 8.8 Set Coil 107
- 8.9 Reset Coil 108
- 8.10 Set Counter Value 109
- 8.11 Up Counter Coil 110
- 8.12 Down Counter Coil 111
- 8.13 Pulse Timer Coil 112
- Bit Logic Instructions 113
- 8.15 On-Delay Timer Coil 114
- 8.17 Off-Delay Timer Coil 116
- 8.22 Set Reset Flipflop 121
- 8.23 Reset Set Flipflop 122
- Timer Instructions 123
- S Timer instructions 124
- S W#16#wxyz 124
- S S5T# aH_bbM_ccS_ddMS 124
- 9.2 Choosing the Right Timer 126
- 9.3 Pulse S5 Timer 127
- 9.4 Extended Pulse S5 Timer 129
- 9.5 On-Delay S5 Timer 131
- 9.7 Off-Delay S5 Timer 135
- Counter Instructions 137
- 10.2 Up-Down Counter 139
- 10.3 Up Counter 141
- 10.4 Down Counter 143
- Integer Math Instructions 145
- 11.1 Add Integer 146
- 11.2 Add Double Integer 147
- 11.3 Subtract Integer 148
- 11.4 Subtract Double Integer 149
- 11.5 Multiply Integer 150
- 11.6 Multiply Double Integer 151
- 11.7 Divide Integer 152
- 11.8 Divide Double Integer 153
- Instructions 155
- Chapter Overview 157
- 12.1 Overview 158
- Description 164
- Floating-Point Numbers 169
- Comparison Instructions 173
- 13.1 Compare Integer 174
- 13.2 Compare Double Integer 175
- S And MD0 = MD4 176
- 14.1 Assign a Value 180
- 14.2 BCD to Integer 182
- 14.3 Integer to BCD 183
- 14.5 BCD to Double Integer 185
- 14.6 Double Integer to BCD 186
- 14.8 Ones Complement Integer 188
- 14.10 Twos Complement Integer 190
- 14.13 Round to Double Integer 193
- 14.15 Ceiling 195
- 14.16 Floor 196
- Word Logic Instructions 197
- 15.1 Overview 198
- 15.2 WAnd Word 199
- 15.3 WAnd Double Word 200
- 15.4 WOr Word 201
- 15.5 WOr Double Word 202
- 15.6 WXOr Word 203
- 15.7 WXOr Double Word 204
- Shift and Rotate Instructions 205
- 16.1 Shift Instructions 206
- 16.2 Rotate Instructions 214
- Data Block Instructions 217
- Jump Instructions 219
- 18.1 Overview 220
- Instructions 221
- 18.5 Label 224
- Status Bit Instructions 225
- 19.1 Overview 226
- 19.2 Exception Bit BR Memory 227
- 19.3 Result Bits 228
- 19.4 Exception Bits Unordered 230
- 19.5 Exception Bit Overflow 231
- Program Control Instructions 235
- 20.3 Return 241
- Reference Manual 244
- Appendix 249
- Programming Examples 267
- B.1 Overview 268
- B.2 Bit Logic Instructions 269
- B.3 Timer Instructions 273
- B.5 Integer Math Instructions 279
- B.6 Word Logic Instructions 280
- Number Notation 283
- C.1 Number Notation 284
- S (3.141593) 289
- References 293
- Reference 294
- Glossary 295
- S Result of a math operation 296
- S Result of a comparison 296
- S Elementary data types 297
- S Complex data types 297
- S Load memory 300
- S Work memory 300
- S System memory 300
- Index-12 316
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