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109740463_PidTemp_MultiZone_DOC_V11_en
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Legal information
PID control with PID_Compact
Entry-ID: 109740463, V1.1, 07/2019
2
© Siemens AG
2019 All rights reserved
Legal information
Use of application examples
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Table of contents
PID control with PID_Compact
Entry-ID: 109740463, V1.1, 07/2019
3
© Siemens
AG 2019 All rights reserved
Table of contents
Legal information ..................................................................................................... 2
1 Task................................................................................................................. 5
1.1 Overview ........................................................................................... 5
2 Solution........................................................................................................... 6
2.1 Overview ........................................................................................... 6
2.2 Hardware and software components .................................................. 8
2.2.1 Validity .............................................................................................. 8
2.2.2 Components used.............................................................................. 8
3 Basics ........................................................................................................... 10
3.1 Pretuning ......................................................................................... 10
3.1.1 Adjusting the delay time ................................................................... 10
3.1.2 Temporarily switching off cooling ..................................................... 10
3.1.3 Procedure ........................................................................................ 10
3.2 Fine tuning....................................................................................... 12
3.2.1 Temporary tuning offset for heating/cooling controller ...................... 12
3.2.2 Synchronizing several fine tunings ................................................... 12
Procedure ........................................................................................ 12
4 Mode of Operation ........................................................................................ 14
4.1 General overview ............................................................................. 14
4.2 FB "SimMultizone” ........................................................................... 17
4.2.1 Simulation of a coupled thermal stretch ............................................ 17
4.2.2 Configuration explanations............................................................... 19
4.2.3 Configuring the FB "SimMultizone”................................................... 21
4.3 FB "MultizoneSut” ............................................................................ 22
4.3.1 Program flow chart........................................................................... 24
4.4 FB "MultizoneTir” ............................................................................. 25
4.4.1 Program flow chart........................................................................... 27
4.5 FB "Waiting” .................................................................................... 28
4.5.1 Program flow chart........................................................................... 30
4.6 FC "TirOffset” .................................................................................. 31
4.6.1 Program flow chart........................................................................... 31
4.7 FC "TirTuningMode” ........................................................................ 32
4.8 FC "DeactivateMode”....................................................................... 33
4.9 FB "StopWatch” ............................................................................... 34
4.10 Data block/PLC data types............................................................... 35
4.10.1 DB "Tags” ........................................................................................ 35
4.10.2 "typeSimMultizoneIn" ....................................................................... 35
4.10.3 "typeMultizoneIn" ............................................................................. 35
4.10.4 "typeZone” ....................................................................................... 36
4.10.5 "typePidTemp" ................................................................................. 36
4.10.6 "typeSimMultizoneArray".................................................................. 36
4.10.7 "typeWaitingIn” ................................................................................ 36
5 Configuration and Settings .......................................................................... 37
5.1 Configuring the technology "PID_Temp” .......................................... 37
5.2 Extension of control zones ............................................................... 39
6 Installation and Commissioning .................................................................. 42
6.1 Installing the hardware ..................................................................... 42
6.2 Commissioning ................................................................................ 43
6.2.1 Network connections ....................................................................... 43
Table of contents
PID control with PID_Compact
Entry-ID: 109740463, V1.1, 07/2019
4
© Siemens
AG 2019 All rights reserved
6.2.2 Setting PG/PC interface ................................................................... 44
6.2.3 Downloading to the controller ........................................................... 45
7 Operating the Application Example ............................................................. 46
7.1 Preparation ...................................................................................... 46
7.2 Pretuning ......................................................................................... 47
7.2.1 Disturbance variable compensation ................................................. 48
7.3 Fine tuning....................................................................................... 51
Disturbance variable compensation ................................................. 53
7.3.1 Tuning of the opposite energy type .................................................. 54
Disturbance variable compensation ................................................. 56
8 Further Notes, Tips and Tricks .................................................................... 58
8.1 Adjusting simulation ......................................................................... 58
8.2 Fine tuning in the event of strong coupling ....................................... 60
9 Links & Literature ......................................................................................... 62
10 History .......................................................................................................... 62
1 Task
1.1 Overview
PID control with PID_Compact
Entry-ID: 109740463, V1.1, 07/2019
5
© Siemens AG
2019 All rights reserved
1 Task
1.1 Overview
Introduction
For a multi-zone control several subsections, so called zones, of a plant are
simultaneously controlled at different temperatures. The mutual impact on the
temperature zones by thermal coupling is characteristic for multi-zone control. This
means that the actual value of a zone can influence the actual value in another
zone by heat coupling. It depends on the structure of the plant and the selected
operating points of the zones how heavily the zones influence each other.
An example of a multi-zone control is an extrusion plant, as it used in plastics
processing, among others.
Mode of Operation
The material is filled in with the help of a funnel (for example, plastic granulate).
The screw conveyor transports the material through the heated and/or cooled
screw cylinder. The material is melted via different temperature zones (by heating,
friction and shearing). In parts, this creates so much heat that the material has to
be cooled. A forming aperture at the end of the extruder (outlet nozzle) presses the
melt into shape. Before shaping, the material has to be cooled.
Overview of the application example
The following figure gives you an overview of the automation task.
Figure 1-1
The control parameters of the individual zone controllers in the application example
are determined simultaneously, despite the temperature influence on the zones.
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