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Chapter 10: Function Blocks LogicPro User’s Guide
152 Watlow Anafaze Doc.# 28002-00 Rev 3.00
RC is the product value. RC contains the product of RA and RB
as long as the enable bit is True. The range of values this
Variable can assume is from -3.4x10
38
to 3.4x10
38
. If this
Variable is assigned a value out of these ranges, ENO is
disabled. RC reverts to its last valid value whenever ENO is
disabled.
Real Divide (RDIV)
The Real Divide (RDIV) function block, shown in Figure
10.32, produces the quotient of two real Variable values.
RDIV calculates the quotient between one value (RA) which is
the dividend and another value (RB) which is the divisor and
places the result in another Variable (RC) when the enable bit
(EN) is True. The values of RA and RB can be preset to a
constant or assigned a Variable name, which allows their
value to change dynamically within the program.
Figure 10.32 Real Divide Function Block
Inputs
EN is the Real Divide enable bit. A True condition of this bit
causes the value of RA to be divided by the value of RB and the
result stored in RC. In a program using Ladder logic, the value
of EN is determined by the Boolean evaluation of elements
placed between the left power rail and EN in the function
block. In FBD programs, the value of EN is determined by the
Variable connected to EN. If no contacts are placed on the
rung before EN in a Ladder Diagram program, the value of EN
is always True. In FBD, all inputs must be connected to a
Variable.
RA is the dividend. The range of values this Variable can
assume is from -3.4x10
38
to 3.4x10
38
. If this Variable is
assigned a value out of these ranges, unpredictable results will
occur.
RB is the divisor. The range of values this Variable can assume
is from -3.4x10
38
to 3.4x10
38
. If this Variable is assigned a
value out of these ranges, unpredictable results will occur.
Also, if RB is assigned a value of zero (0), the enable out bit
becomes False and RC retains its previous value.
- LogicPro 1
- User’s Guide 1
- Warranty 2
- Table of Contents 3
- List of Figures 11
- List of Tables 15
- Introduction 17
- Chapter Title Description 18
- Conventions Used 19
- Safety symbols 20
- LogicPro Workplace 21
- Menu Bar 22
- File Menu 23
- Edit Menu 24
- Table 2.2 The Edit Menu 25
- Menu Option 26
- Description 26
- View Menu 27
- Tools Menu 27
- Table 2.4 The Tools Menu 28
- Execution Menu 29
- Simulation Menu 29
- Options Menu 30
- Menu Option Description 31
- Windows Menu 32
- Help Menu 33
- Status Bar 34
- Toolbars 34
- Button Description 35
- Language Toolbars 36
- Table 2.14 The Ladder Toolbar 37
- Table 2.15 The FBD Toolbar 37
- SFC Actions 38
- Ladder Rungs 38
- Standard Text 39
- Projects 41
- Creating a Project 42
- Opening a Project 43
- Copying Projects 44
- Backing Up a Project 45
- Closing a Project 47
- Deleting a Project 47
- Resources 49
- PPC-2000 Attributes 50
- CPC400 Attributes 51
- Editing a Resource 52
- Copying Resources 52
- Resource Backup 53
- Deleting a Resource 54
- Opening a Resource 55
- Programs 57
- Opening a Program 58
- Saving a Program 59
- Closing a Program 59
- Copying Programs 60
- Backing Up a Program 61
- Deleting a Program 63
- Variables 65
- Retentive Variables 66
- System Variables 66
- Project Variables 67
- Adding a Project Variable 68
- Editing a Project Variable 69
- Cloning a Project Variable 71
- Resource Variables 72
- Program Variables 77
- Using the Find Command 78
- Figure 6.8 Find Variable 79
- Using the Replace Command 80
- Import/Export 81
- Replace All 82
- Replace I/O Variables Only 82
- Exporting an ASCII file 86
- Sequential Function Charts 87
- SFC Toolbar 88
- Origin Step 89
- Step 89
- Simultaneous Transition 90
- Conditions 91
- Loop Back 93
- Action 94
- Ladder Diagrams 97
- Ladder Toolbar 98
- Normally Open Contact 99
- Normally Closed Contact 100
- Normal Coil 101
- Latched Coil 101
- Unlatched Coil 102
- Function Block 102
- Comments 102
- Viewing the Grid 103
- Cross Reference 103
- Inserting Rungs 104
- Inserting Elements 104
- Inserting Function Blocks 105
- Are Added to Function Block 107
- Function Block 108
- Connecting New Elements 108
- Output Element 109
- Figure 8.16 Branch Added 111
- Cutting Rungs 114
- Copying Rungs 115
- Pasting Rungs 115
- Deleting Elements 116
- Moving Elements 116
- Assigning Labels to Rungs 116
- Assigning Variable Names 117
- Input/Output Dialog Box 119
- Hiding Rung Comments 120
- Function Block Diagrams 121
- Selector 122
- Straight Connections 122
- Inverted Connections 122
- Creating an FBD Program 123
- Dialog Box 127
- With Handles 130
- Function Blocks 131
- Counter Up (CTU) 132
- Counter Down (CTD) 133
- Inputs 134
- Outputs 134
- Counter Up Down (CTUD) 135
- FBD programs, the value 136
- FBD programs, the value of 136
- Timer Pulse (TP) 137
- Timer On-Delay (TON) 139
- Timer Off-Delay (TOF) 140
- Comparison 142
- Less Than (LT) 143
- Equal To (EQ) 144
- Arithmetic 146
- Subtract (SUB) 147
- Multiply (MULT) 148
- Divide (DIV) 149
- Data Manipulation 151
- Last In - First Out (LIFO) 153
- Bit Shift (SL) 156
- Scan Time Counter (SCAN) 158
- Move (MOVE) 159
- Scale (SCL) 160
- Real Number Function Blocks 161
- Real Less Than (RLT) 162
- Real Equal To (REQ) 163
- Real Add (RADD) 164
- Real Subtract (RSUB) 165
- Real Multiply (RMUL) 167
- Real Divide (RDIV) 168
- Real Move (RMOV) 169
- Integer To Real (ITOR) 170
- Real to Integer (RTOI) 171
- Square Root (SRT) 171
- Logical 173
- Comparison (CMP) 174
- Calculation (CALC) 175
- Table 10.1 Symbol Operation 176
- Jump (JMP) 177
- InterLock (IL) 178
- InterLock-Clear (ILC) 178
- Rotation (RROT/LROT) 179
- Shift (RSFT/LSFT) 180
- Negation (NEG) 181
- User Defined Function Blocks 183
- Operations 186
- UDFB Files 188
- Initialization Function 189
- Reset Function 189
- Exit Function 189
- UDFB in Simulation 191
- Working with UDFB Files 193
- Saving UDFB Files 194
- Deleting UDFBs 194
- UDFB Tutorial 195
- Input/Output Drivers 201
- Variable Types 202
- Input/Output 203
- IO Size 203
- PPC-2000 IO Drivers 204
- Module Specific Drivers 205
- Specific Drivers 205
- Table 12.9 207
- Using the IO Drivers 208
- Analog_In_202x 209
- Encoder_Analog_2030 210
- Digital_IO_2040 211
- Click [OK] 212
- Analog_Out_205x 213
- Digital_Out_206x 214
- Digital_In_207x 215
- Setpoint 216
- Soft_Input 217
- Soft_Bool 218
- Soft_Int 219
- Database 220
- Program/Resource Variable 221
- Global Parameter Example 223
- CPC400 IO Drivers 224
- Setpoint 225
- CPC400_Digital_In 228
- CPC400_Digital_Out 229
- CPC400 User’s Guide 236
- Compiler Setup 237
- Figure 13.2 Compiler Paths 238
- Simulation 241
- Using the Simulation Tools 243
- Simulation Setup 244
- Timer Ticks 245
- Resetting the Simulation 247
- Closing the Simulation 249
- Downloading and Monitoring 251
- Monitoring a Program 253
- Monitoring Ladder Diagrams 255
- Forcing I/O 256
- Variable Watch 257
- Configuring Variable Watch 258
- Forcing Variables 259
- Watch Grid View 260
- Watch Window 261
- On-Line Constant Changes 262
- Change Dialog Box 263
- Cross-Referencing 265
- Cross-Reference Output 267
- Output Printing 269
- Report Setup 270
- Variables Setup 271
- Ladder Setup 271
- SFC Setup 272
- FBD Setup 273
- Dynamic Data Exchange 275
- Installation 276
- Configuration 276
- Creating A New Topic 278
- Open a Topic 279
- Close a Topic 279
- Modify a Topic 279
- Delete a Topic 279
- Item Point Naming 280
- Figure 17.1 Example 1 281
- Setting Up Excel to Read 282
- =LP_DDE 283
- Glossary 285
- Variable 296
- Windows NT 296
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