Siemens S7-400 Service Manual Page 155
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Status Bit Instructions
Ladder Logic (LAD) for S7-300 and S7-400 Programming
A5E00706949-01
12-7
12.6 ==0 ---| |--- Result Bit Equal 0
Symbol
or negation
/
==0
==0
Description
==0 ---| |--- (Result Bit Equal 0) or ==0 ---| / |--- (Negated Result Bit Equal 0)
contact symbols are used to recognize if the result of a math function is equal to
"0". The instructions scan the condition code bits CC 1 and CC 0 in the status
word in order to determine the relation of the result to "0". Used in series, the result
of the scan is linked to the RLO by AND, used in parallel, it is linked to the RLO by
OR.
Status word
BR CC 1 CC 0 OV OS OR STA RLO /FC
writes: - - - - - x x x 1
Examples
SUB_I
EN
OUT
IN2
ENO
IN1
IW2
IW0
MW10
I 0.0 ==0
S
Q 4.0
The box is activated by signal state "1" at I0.0. If the value of IW0 is equal to the
value of IW2, the result of the math function "IW0 - IW2" is "0". Q4.0 is set if the
function is properly executed and the result is equal to "0".
SUB_I
EN
OUT
IN2
ENO
IN1
IW2
IW0
MW10
I 0.0 ==0
S
Q 4.0
Q4.0 is set if the function is properly executed and the result is not equal to "0".
- 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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