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Example "PID control"
4.2 Set organization block for PID controller
STEP 7 Basic V10.5
138 Getting Started, 12/2009, A5E02651459-01
4.2 Set organization block for PID controller
Introduction
The blocks for the PID controller are created in a new organization block. A cyclic interrupt
organization block, which you will now create, is used as new organization block.
Cyclic interrupt organization blocks serve to start programs in periodic time intervals
independent of the cyclic program execution. Cyclic program execution will be interrupted by
the cyclic interrupt OB and resume after the interrupt.
The following figure shows the program execution with a cyclic interrupt OB:
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0DLQ>2%@F\FOH
&\FOLF,QWHUUXSW>2%@
PV
2SHUDWLQJV\VWHP3/&
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① Program starts with Main [OB1].
② A cyclic interrupt is triggered every 100 ms, which interrupts the program at any point (for
example, during Main [OB1]) and executes the program in the cyclic interrupt OB.
In this case the program consists of a function block PID_Compact.
③ PID_Compact is executed and the values are written to the data block PID_Compact (DB).
④ After execution of the cyclic interrupt OB, Main [OB1] will be continued at the point at which it
was interrupted. The values remain intact.
⑤ Main [OB1] is completed.
⑥ The program cycle starts again.
In the example project you use the cyclic interrupt OB to call the technological object
"PID_Compact". The technological object "PID_Compact" is the image of the PID controller
in the software. You can use this technological object to configure a PID controller, activate it
and control its execution status.
- SIMATIC 1
- TIA Portal 1
- STEP 7 Basic V10.5 1
- Legal information 2
- Table of contents 3
- 1.1 Overview 6
- 1.2 TIA Portal basics 7
- 7,$3RUWDO 8
- 8QLIRUPHQJLQHHULQJV\VWHP 8
- :LQ&&%DVLF9 8
- 67(3%DVLF9 8
- 1.2.3 Data management 9
- Library concept 10
- 1.3 Views in the TIA portal 11
- 1.3.2 Portal view 12
- 1.3.3 Project view 13
- TIA Portal Introduction 14
- 1.3 Views in the TIA portal 14
- 1.4 Example projects 15
- 1.4 Example projects 16
- 1.4.2 Loading a project 17
- TIA Portal Introduction 19
- 1.4 Example projects 19
- Simple example 21
- 2.3.1 Inserting a PLC 23
- Simple example 25
- Network view 26
- Device view 28
- 2.3.3 Configure PLC 29
- 2.4 Create program 31
- 2.4 Create program 33
- 2.4 Create program 34
- 2.4.4 What are networks? 35
- LAD instructions 36
- Normally open contact 37
- Negated coil 38
- 2.4.6 What are tags? 42
- PLC tag table 44
- 2.5 Test program 48
- 2.5 Test program 50
- 2.5 Test program 51
- Additional information 53
- +0, 3/& 3URFHVV 57
- Adding a new HMI device 58
- 2.6 Create HMI screen 59
- 2.6 Create HMI screen 60
- Graphic objects 65
- Use of graphic objects 65
- External HMI tags 66
- Internal HMI tags 77
- 2.7 Testing HMI screen 85
- 2.7.2 Simulate runtime 87
- 2.7 Testing HMI screen 88
- 3.1 Introduction 90
- 3.2 Expanding the program 91
- Normally closed contact 97
- Extended example 100
- 3.2 Expanding the program 100
- 2SHUDQG! 101
- Procedure 102
- Requirements 103
- Introduction 103
- Extended example 105
- 3.2 Expanding the program 105
- On delay 110
- Output coil 110
- 3.4 Expand HMI screen 123
- 3.4 Expand HMI screen 124
- 3.4 Expand HMI screen 129
- 3.5 Simulate HMI screen 132
- Testing in the HMI device 133
- 3.5 Simulate HMI screen 134
- 4.1 Introduction 135
- Use of the PID controller 136
- 4.1 Introduction 137
- STEP 7 Basic V10.5 140
- 4.4 Load simulation block 143
- 4.4 Load simulation block 144
- 4.4 Load simulation block 145
- 4.5 Configure PID controller 150
- Block name 151
- Parameter 151
- 4.8 Adjust HMI screen 158
- 4.8 Adjust HMI screen 159
- 4.8 Adjust HMI screen 160
- Controller optimization 161
- Example "Motion" 165
- Hardware configuration 166
- Example "Motion" 167
- 5.1 Introduction 167
- 5.4 Enable axis 173
- 5.4 Enable axis 174
- 5.4 Enable axis 175
- 5.5 Position axis relative 176
- 5.5 Position axis relative 177
- 5.5 Position axis relative 178
- 5.6 Expand HMI screen 180
- 5.6 Expand HMI screen 181
- 5.6 Expand HMI screen 184
- 5.7 Simulate HMI screen 189
- 5.7 Simulate HMI screen 190
- 5.8 Start diagnostics view 191
- 5.8 Start diagnostics view 192
- 5.8 Start diagnostics view 193
- Glossary 197
- Glossary 199
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