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14-4
Ladder Logic (LAD) for S7-300 and S7-400
C79000-G7076-C504-02
14.2 BCD to Integer
The BCD to Integer conversion instruction reads the contents specified in the
input parameter IN as a three-digit number in binary coded decimal format
(BCD, " 999) and converts this number to an integer value. The output
parameter OUT provides the result.
ENO and EN always have the same signal state.
If a place of a BCD number is in the invalid range of 10 to 15, a BCDF error
occurs during an attempted conversion.
S The CPU goes into the STOP mode. “BCD Conversion Error” is entered
in the diagnostic buffer with event ID number 2521.
S If OB121 is programmed, it is called. For more information on
programming OB121, see the Programming Manual /234/.
Certain restrictions apply to the placement of the BCD to Integer conversion
box (see Section 6.1).
Table 14-2 BCD to Integer Conversion Box and Parameters
LAD Box Parameter Data Type Memory Area Description
BCD I
EN BOOL I, Q, M, D, L Enable input
BCD
_
I
EN ENO
ENO BOOL I, Q, M, D, L Enable output
EN
IN OUT
ENO
IN WORD I, Q, M, D, L Number in BCD format
OUT INT I, Q, M, D, L Integer value of BCD number
Status Word Bits
BR CC 1 CC 0 OV OS OR STA RLO FC
Write 1 – – – – 0 1 1 x
I 0.0
If the signal state of input I 0.0 is 1, the
conversion is executed. The contents of
memory word MW10 is read as a
three-digit number in BCD format and
converted to an integer. The result is
stored in memory word MW12. If the
conversion is not executed, the signal
state of output Q 4.0 is 1 (ENO = EN).
Q 4.0
BCD_I
EN ENO
MW12INMW10
NOT
Function is executed (EN = 1):
OUT
Figure 14-2 BCD to Integer
Description
Move and Conversion Instructions
- 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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