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C-3
Ladder Logic (LAD) for S7-300 and S7-400
C79000-G7076-C504-02
Table C-2 Constant Formats for Elementary Data Types
Type and
Description
Size
in
Bits
Format Options Range and Number Notation
(Lowest Value to Highest Value)
Example
BOOL
(Bit)
1 Boolean text TRUE/FALSE TRUE
BYTE
(Byte)
8 Hexadecimal B#16#0 to B#16#FF B#16#10
byte#16#10
WORD
(Word)
16 Binary
Hexadecimal
BCD
Unsigned decimal
2#0 to
2#1111_1111_1111_1111
W#16#0 to W#16#FFFF
C#0 to C#999
B#(0,0) to B#(255,255)
2#0001_0000_0000_0000
W#16#1000
word16#1000
C#998
B#(10,20)
byte#(10,20)
DWORD
(Double
word)
32 Binary
Hexadecimal
Unsigned decimal
2#0 to
2#1111_1111_1111_1111_
1111_1111_1111_1111
DW#16#0000_0000 to
DW#16#FFFF_FFFF
B#(0,0,0,0) to
B#(255,255,255,255)
2#1000_0001_0001_1000_
1011_1011_0111_1111
DW#16#00A2_1234
dword#16#00A2_1234
B#(1,14,100,120)
byte#(1,14,100,120)
INT
(Integer)
16 Signed decimal -32768 to 32767 1
DINT
(Double
integer)
32 Signed decimal L#-2147483648 to L#2147483647 L#1
REAL
(Floating
point)
32 IEEE
floating point
Upper limit: ±3.402823e+38
Lower limit: ±1.175 495e-38 (see also
Table C-5)
1.234567e+13
S5TIME
(SIMATIC
time)
16 S5 Time in
10-ms units (as
default value)
S5T#0H_0M_0S_10MS to
S5T#2H_46M_30S_0MS and
S5T#0H_0M_0S_0MS
S5T#0H_1M_0S_0MS
S5TIME#0H_1M_0S_0MS
TIME
(IEC time)
32 IEC time in 1-ms
units, signed
integer
T#-24D_20H_31M_23S_648MS to
T#24D_20H_31M_23S_647MS
T#0D_1H_1M_0S_0MS
TIME#0D_1H_1M_0S_0MS
DATE
(IEC date)
16 IEC date
in 1-day units
D#1990-1-1 to
D#2168-12-31
D#1994-3-15
DATE#1994-3-15
TIME_OF_
DAY
(Time of
day)
32 Time of day in
1-ms units
TOD#0:0:0.0 to
TOD#23:59:59.999
TOD#1:10:3.3
TIME_OF_DAY#1:10:3.3
CHAR
(Character)
8 Character ’A’,’B’, and so on ’E’
An integer is a whole number that has a sign to indicate whether it is positive
or negative. In memory, a 16-bit integer takes up one word of space.
Table C-3 shows the range of a 16-bit integer. Figure C-1 shows the integer
+ 44 in binary format.
Integers: 16 Bits
Number Notation
- 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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