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STEP 7 Basic V10.5
Getting Started, 12/2009, A5E02651459-01
135
Example "PID control"
4
4.1 Introduction
Loading a project
If you have skipped the previous chapters, you can load the project status at the end of the
last chapter (see "Loading a project (Page 17)"). The project status at the end of this chapter
is stored in the "Extende
d_Example.ZIP" file.
Introduction
A controller is always required when a certain physical value, such as temperature, pressure
or speed, has to have a specific value in the process and this value can change depending
on external conditions that cannot be foreseen.
Definition PID controller
A PID controller consists of one proportional, one integral and one derivative element. It
continuously detects the measured actual value of the controlled variable within a control
loop and compares it with the desired setpoint. The PID uses the resulting control deviation
to calculate a controller output that adjusts the controlled variable as quickly and smoothly as
possible to the setpoint.
Definition control loop
A control loop is made up of a controlled system, the controller, the measuring element
(sensor) and a final controlling element.
● In this example the PID control SIMATIC S7-1200 is used as the controller.
● The measuring element in this example is a sensor that measures the temperature inside
the heating chamber.
● The final controlling element is the heater that is directly actuated by the PLC.
The following wiring diagram contains a typical control loop:
&RQWUROOHU. &RQWUROOHGV\VWHP*
- 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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