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Siemens pcs 7 manual

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Table of contents for the manual

  • Page 1

    Applikationen & Tools Answers for indust ry. Deckblatt Model Predictive Control including integral transfer functions SIMATIC PCS 7 Application Example  April 2010[...]

  • Page 2

    [...]

  • Page 3

    MPC Level V 1.0, Beitrags-ID: 42200753 3 Copyright  Siemens AG 2010 All rights reserved Industry Automation and Driv es Tech nologies Service & Support Portal This article is taken from the Service Portal of Siemens AG, Industry Automation and Drives Technologies. The followi ng link takes you dire ctly to the download page of this document.[...]

  • Page 4

    Warranty and Liability 4 MPC Level V 1.0, Beitrags-ID: 42200753 Copyright  Siemens AG 2010 All rights reserved Warranty and Liability Note The Application Examples are not bindin g and do not claim to be complete regarding the circuits shown, equipping and any eventuality. The Application Examples do not represent customer-sp ecific solutions. T[...]

  • Page 5

    Table of Contents MPC Level V 1.0, Beitrags-ID: 42200753 5 Copyright  Siemens AG 2010 All rights reserved T able of Content s Warranty a nd Liability ................................................................................................. 4 1 Preface .......................................................................................[...]

  • Page 6

    Preface 6 MPC Level V 1.0, Beitrags-ID: 42200753 Copyright  Siemens AG 2010 All rights reserved 1 Preface Objective of the Application The area of application of the model pred ictive controller provided in SIMATIC PCS 7 (function block ModP reCon and MP C respectiv ely) is restricted by the following fact: The control algorithm only works f or [...]

  • Page 7

    Introduction MPC Level V 1.0, Beitrags-ID: 42200753 7 Copyright  Siemens AG 2010 All rights reserved 2 Introduction 2.1 Basic Principles of Model Predictive Control A general overview of model predictive control is provided by the White Paper “How to improve the Performance of yo ur Plant using the appropri ate tools of SIMATIC PCS 7 APC-Portf[...]

  • Page 8

    Introduction 8 MPC Level V 1.0, Beitrags-ID: 42200753 Copyright  Siemens AG 2010 All rights reserved Figure 2-1 Step response of a control loo p with compensation (blue) and witho ut compensation (red), i.e. with integral behaviour. 0 10 20 30 40 50 60 70 80 90 100 0 0.5 1 1.5 2 2.5 3 Step Respons e Time (sec) Amplitude mit Ausgleich ohne Ausgle[...]

  • Page 9

    Introduction MPC Level V 1.0, Beitrags-ID: 42200753 9 Copyright  Siemens AG 2010 All rights reserved 2.3 Examples of Unstable Control Loops 2.3.1 Level Control If the level of a tank with continuous feed is to be controlled via an a djustable drain as actuator (e.g. pump or valve with or wi thout flow control), the control loop shows integrating[...]

  • Page 10

    Introduction 10 MPC Level V 1.0, Beitrags-ID: 42200753 Copyright  Siemens AG 2010 All rights reserved feed water tanks. There are different objec tives for level control according to the plant context [also see Related Literature /2./]:  Keep level constant (exactly at the set point) – impo rtant for levels dire ctly in- fluencing the proce[...]

  • Page 11

    Introduction MPC Level V 1.0, Beitrags-ID: 42200753 11 Copyright  Siemens AG 2010 All rights reserved 2.3.3 Position Control The control loop shows integrating b ehaviour if the position of mechanical parts is controlled and the speed of the actuator is available as manipulated variable. An "equilibrium condition" without move in the p[...]

  • Page 12

    Stabilization of Unst able Control Loops 12 MPC Level V 1.0, Beitrags-ID: 42200753 Copyright  Siemens AG 2010 All rights reserved 3 S t abilization of Unst able Control Loop s Regarding the stabilization of unstable c ontrol loops, integral processes and mono- tone unstable or oscillating unstable processes have to be distin guished. In general [...]

  • Page 13

    Stabilization of Unst able Control Loops MPC Level V 1.0, Beitrags-ID: 42200753 13 Copyright  Siemens AG 2010 All rights reserved The behaviour of an integrating process   1 1   s t s k s g i i can be described by two parameters:  The maximal gradient k i of the response to a unit-step (of height on e)  The delay time t 1[...]

  • Page 14

    Stabilization of Unst able Control Loops 14 MPC Level V 1.0, Beitrags-ID: 42200753 Copyright  Siemens AG 2010 All rights reserved 3.2 PID Tuner The PCS 7 PID tuner can be used for integral processes with out problems if at least one stable controller parameterization is already available. The following hints are helpful for this:  Fix the che[...]

  • Page 15

    Configuration of MPC with Slave Controller MPC Level V 1.0, Beitrags-ID: 42200753 15 Copyright  Siemens AG 2010 All rights reserved 4 Configuration of MPC with Slave Controller 4.1 Starting Point The starting point is the standard connection of the MPC with its a ctuators. The structure of the following example corresponds to the control of pro [...]

  • Page 16

    Configuration of MPC with Slave Controller 16 MPC Level V 1.0, Beitrags-ID: 42200753 Copyright  Siemens AG 2010 All rights reserved Figure 4-2 Signal flow chart of MPC with s ubordinated stabilizing PID controller for the integral main transfer function g22 The slave controller stabili zes the control variable CV1 in gene ral. The integral ef- f[...]

  • Page 17

    Configuration of MPC with Slave Controller MPC Level V 1.0, Beitrags-ID: 42200753 17 Copyright  Siemens AG 2010 All rights reserved Figure 4-3 Connection of MPC and slave co ntroller[...]

  • Page 18

    Configuration of MPC with Slave Controller 18 MPC Level V 1.0, Beitrags-ID: 42200753 Copyright  Siemens AG 2010 All rights reserved 4.3 Commissioning The parameterization of the controller a nd the commissionin g is done „from interior to exterior” as in any cascade control. First the slave controller is tuned (see chap- ter 3) and switched [...]

  • Page 19

    Simulation Example MPC Level V 1.0, Beitrags-ID: 42200753 19 Copyright  Siemens AG 2010 All rights reserved 5 Simulation Example The simulation example was generated from a co py of the plant section ModPre- Con of the APL_Example_EU, by introduci ng an a dditional integral block after the transfer function Proc662. Figure 5-1 Modified process s[...]

  • Page 20

    Simulation Example 20 MPC Level V 1.0, Beitrags-ID: 42200753 Copyright  Siemens AG 2010 All rights reserved Figure 5-2 OS picture of the example proj ect Despite the interaction bet ween both m anipulated variables MV1 a nd MV2 and the integral action of MV2 on PV2, both control variables PV1 and P V2 of the master controller can be cont rolled [...]

  • Page 21

    Conclus ion MPC Level V 1.0, Beitrags-ID: 42200753 21 Copyright  Siemens AG 2010 All rights reserved 6 Conclusion The area of application of the model pred ictive controller embedd ed in SIMATIC PCS 7 is extended clearly by the descri bed stabilization of unstabl e sub control loops with the help of a slave propo rtional- only controller. A typi[...]

  • Page 22

    Related Literature 22 MPC Level V 1.0, Beitrags-ID: 42200753 Copyright  Siemens AG 2010 All rights reserved 7 Related Literature 7.1 Bibliography This list is not complete and only rep resents a selection of relevant literature. Tabelle 7-1 Titel /1/ Krämer, S. Auslegung von Standreglern i n der verfahrenstechnischen Praxis. Dechem a- Seminar ?[...]

  • Page 23

    History MPC Level V 1.0, Beitrags-ID: 42200753 23 Copyright  Siemens AG 2010 All rights reserved 8 History Tabelle 8-1 Version Date Modifications V1.0 04.’10 First version[...]