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Floating-Point Math Instructions
Statement List (STL) for S7-300 and S7-400 Programming
A5E00706960-01
8-3
8.3 Floating-Point Math Instructions: Basic
8.3.1 +R Add ACCU 1 and ACCU 2 as a Floating-Point Number (32-Bit
IEEE-FP)
Format
+R
Description of instruction
+R
(add 32-bit IEEE floating-point numbers) adds the contents of accumulator 1 to
the contents of accumulator 2 and stores the result in accumulator 1. The contents of
accumulator 1 and accumulator 2 are interpreted as 32-bit IEEE floating-point
numbers. The instruction is executed without regard to, and without affecting, the
RLO. The status bits CC 1, CC 0, OS, and OV are set as a function of the result of
the instruction.
The contents of accumulator 2 remain unchanged for CPUs with two ACCUs.
The contents of accumulator 3 are copied into accumulator 2, and the contents of
accumulator 4 are copied into accumulator 3 for CPUs with four ACCUs. The
contents of accumulator 4 remain unchanged.
Result
The result in ACCU 1 is CC 1 CC 0 OV OS Note
+qNaN 1 1 1 1
+infinite 1 0 1 1 Overflow
+normalized 1 0 0 -
+denormalized 0 0 1 1 Underflow
+zero 0 0 0 -
-zero 0 0 0 -
-denormalized 0 0 1 1 Underflow
-normalized 0 1 0 -
-infinite 0 1 1 1 Overflow
-qNaN 1 1 1 1
- A5E00706960-01 1
- Safety Guidelines 2
- Qualified Personnel 2
- Prescribed Usage 2
- Trademarks 2
- Disclaimer of Liability 2
- Preface 3
- Requirements 4
- Online Help 5
- Further Support 5
- Training Centers 5
- Technical Support 6
- Contents 12
- 1 Bit Logic Instructions 13
- 1.2 A And 15
- 1.3 AN And Not 16
- 1.4 O Or 17
- 1.5 ON Or Not 18
- 1.6 X Exclusive Or 19
- 1.7 XN Exclusive Or Not 20
- 1.8 O And before Or 21
- Bit Logic Instructions 23
- Bit Logic Instructions 24
- 1.15 ) Nesting Closed 26
- 1.16 = Assign 28
- 1.17 R Reset 29
- 1.18 S Set 30
- 1.19 NOT Negate RLO 31
- 1.20 SET Set RLO (=1) 32
- 1.21 CLR Clear RLO (=0) 33
- 1.23 FN Edge Negative 35
- 1.24 FP Edge Positive 37
- 2 Comparison Instructions 39
- RLO values 40
- 3 Conversion Instructions 43
- 3.15 RND Round 57
- 3.16 TRUNC Truncate 58
- 4 Counter Instructions 61
- LC Z3 64
- 4.5 R Reset Counter 65
- 4.7 CU Counter Up 67
- 4.8 CD Counter Down 68
- 5 Data Block Instructions 69
- Data Block Instructions 72
- Data Block Instructions 73
- 6 Logic Control Instructions 75
- 6.3 JL Jump to Labels 78
- 6.4 JC Jump if RLO = 1 79
- 6.5 JCN Jump if RLO = 0 80
- <jump 82
- 6.8 JBI Jump if BR = 1 83
- 6.9 JNBI Jump if BR = 0 84
- 6.10 JO Jump if OV = 1 85
- 6.11 JOS Jump if OS = 1 86
- 6.12 JZ Jump if Zero 87
- 6.13 JN Jump if Not Zero 88
- 6.14 JP Jump if Plus 89
- 6.15 JM Jump if Minus 90
- 6.19 LOOP Loop 94
- 7 Integer Math Instructions 95
- Instructions 96
- Format 100
- Description 100
- Status word 100
- Example 100
- Example: 13 divided by 4 101
- Example 1 102
- Example 2 102
- Example 3 103
- (32-Bit) 105
- IEEE-FP) 113
- (32-Bit IEEE-FP) 115
- Description of instruction 120
- Result 120
- Number (32-Bit) 122
- Numbers (32-Bit) 126
- 9.2 L Load 132
- Contents of ACCU 1 133
- Integer (32-Bit Pointer) 136
- Register 2 137
- 9.9 T Transfer 139
- (32-Bit Pointer) 142
- 10.2 BE Block End 146
- 10.5 CALL Block Call 149
- 10.6 Call FB 151
- Program Control Instructions 152
- 10.7 Call FC 153
- 10.8 Call SFB 155
- 10.9 Call SFC 157
- 10.10 Call Multiple Instance 158
- 10.17 )MCR End MCR 166
- 11.1 Shift Instructions 169
- Formate 170
- Examples 170
- 11.2 Rotate Instructions 182
- 12 Timer Instructions 189
- Area in Memory 190
- Time Value 190
- Time Base 191
- Bit Configuration in ACCU 1 191
- Choosing the right Timer 192
- Timer Instructions 194
- 12.6 R Reset Timer 199
- 12.7 SP Pulse Timer 200
- Timer Instructions 201
- 12.9 SD On-Delay Timer 204
- 12.11 SF Off-Delay Timer 208
- 13 Word Logic Instructions 211
- 13.3 OW OR Word (16-Bit) 214
- Word Logic Instructions 224
- 14 Accumulator Instructions 225
- Accumulator Instructions 236
- Mnemonics (SIMATIC) 239
- Mnemonics (International) 245
- B Programming Examples 251
- PEB1PEB2 254
- Statement List 256
- Clock Pulse Generator 257
- Signal Check 257
- Programming Examples 261
- Solving a Math Problem 262
- Heating an Oven 263
- Programming Examples 264
- Parameter Transfer 266
- Index-6 272
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