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Integer Math Instructions
Ladder Logic (LAD) for S7-300 and S7-400 Programming
7-8
A5E00706949-01
7.8 SUB_DI Subtract Double Integer
Symbol
SUB_DI
EN
OUT
IN2
ENO
IN1
Parameter Data Type Memory Area Description
EN BOOL I, Q, M, L, D Enable input
ENO BOOL I, Q, M, L, D Enable output
IN1 DINT I, Q, M, L, D
or constant
First value for subtraction
IN2 DINT I, Q, M, L, D
or constant
Value to subtract
OUT DINT I, Q, M, L, D Result of subtraction
Description
SUB_DI
(Subtract Double Integer) is activated by a logic "1" at the Enable (EN)
Input. IN2 is subtracted from IN1 and the result can be scanned at OUT. If the
result is outside the permissible range for a double integer (32-bit), the OV bit and
OS bit will be "1" and ENO is logic "0", so that other functions after this math box
which are connected by the ENO (cascade arrangement) are not executed.
See also Evaluating the Bits of the Status Word with Integer Math Instructions.
Status word
BR CC 1 CC 0 OV OS OR STA RLO /FC
writes: x x x x x 0 x x 1
Example
SUB_DI
IN2
IN1
EN
MD0
Q 4.0I 0.0
MD4
ENO
MD10OUT
S
NOT
The SUB_DI box is activated if I0.0 = "1". The result of the subtraction MD0 - MD4
is output to MD10. If the result was outside the permissible range for a double
integer, the output Q4.0 is set.
- 6ES7810-4CA08-8BW1 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 7
- A5E00706949-01 10
- 1 Bit Logic Instructions 11
- 1.4 XOR Bit Exclusive OR 14
- 1.6 ---( ) Output Coil 16
- 1.8 ---( R ) Reset Coil 20
- 1.9 ---( S ) Set Coil 22
- Symbol 32
- 1.17 Immediate Read 33
- 1.18 Immediate Write 34
- Bit Logic Instructions 36
- 2 Comparison Instructions 37
- Symbols 38
- 2.4 CMP ? R Compare Real 42
- Comparison Instructions 44
- 3 Conversion Instructions 45
- 3.2 BCD_I BCD to Integer 46
- 3.3 I_BCD Integer to BCD 47
- 3.15 CEIL Ceiling 59
- 3.16 FLOOR Floor 60
- 4 Counter Instructions 61
- Counter Instructions 62
- 4.2 S_CUD Up-Down Counter 63
- 4.3 S_CU Up Counter 65
- 4.4 S_CD Down Counter 67
- <C no.> <Z no.> 70
- 5 Data Block Instructions 75
- Data Block Instructions 76
- 6 Logic Control Instructions 77
- 6.5 LABEL Label 81
- Logic Control Instructions 82
- 7 Integer Math Instructions 83
- Math Instructions 84
- 7.3 ADD_I Add Integer 85
- 7.4 SUB_I Subtract Integer 86
- 7.5 MUL_I Multiply Integer 87
- 7.6 DIV_I Divide Integer 88
- Integer Math Instructions 94
- Point Math Instructions 96
- 8.3 Basic Instructions 97
- Description 100
- Status word 100
- Example 100
- 8.4 Extended Instructions 103
- 9 Move Instructions 113
- Symbol 124
- SRCBLK RET_VAL 125
- 10.7 Call Multiple Instance 126
- 10.14 ---(RET) Return 134
- 11.1 Shift Instructions 135
- 11.2 Rotate Instructions 145
- Status Bit Instructions 152
- Examples 155
- Area in Memory 162
- Time Value 162
- Time Base 163
- Choosing the right Timer 164
- Timing Diagram 166
- 14.3 WOR_W (Word) OR Word 187
- Word Logic Instructions 192
- Mnemonics (International) 193
- Mnemonics (SIMATIC) 196
- B Programming Examples 201
- Clock Pulse Generator 206
- Signal Check 207
- Programming Examples 209
- Solving a Math Problem 213
- Ladder Logic Program 213
- Heating an Oven 214
- Programming Examples 216
- C Working with Ladder Logic 217
- end: AN error 218
- 5 NOP 0 222
- C.2 Parameter Transfer 223
- Working with Ladder Logic 224
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