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4-6
Ladder Logic (LAD) for S7-300 and S7-400
C79000-G7076-C504-02
4.4 Editing Actual Data Values
When you create and save a data block for the first time, the declared
(optional) initial value is automatically assumed as the actual value of the
variable. When it accesses the data block, the user program continues to use
this as the actual value, unless you explicitly specify a new actual value for
the variable in the user program.
The actual values of the variables are changed by the logic blocks writing to
them while the CPU program is being executed. You can display and change
the actual values of variables yourself.
You must switch to the data view to display and edit actual data values in
data blocks. Open a data block and use the menu command View
"
Data
View to switch to the data view.
The only difference between the data view and the declaration view of a data
block is the additional column “Actual Value”. In the data view, the elements
of variables with a complex data type are displayed individually and with
their complete symbolic name, so that each of their actual values can be
displayed and edited (see Figure 4-4).
DB17 - <Offline>
Address Symbol Type Initial Value Comment
motor.speed
motor.runtime
motor.history
motor.motor_off
INT
DINT
REAL
BOOL
100
L#0
0.000000e+000
0.0
2.0
6.0
10.0
10.1
motor.motor_on BOOL
field[1] INT12.0
field[2] INT
0
14.0
FALSE
FALSE
Maximum RPM
field[3] INT16.0
0
0
Actual Value
89
L#0
0.000000e+000
7
TRUE
FALSE
4
8
Figure 4-4 Data Block in the Data View
The displayed actual value is either the value that the variable had when you
opened the data block or the most recently modified and saved value.
Note
If you open data blocks online, the actual value is not updated cyclically.
Initial Value –
Actual Value
Data View of Data
Blocks
Displayed Actual
Value
Creating Data Blocks and User-Defined Data Types
- 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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