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3441 Industrial Instruments 1 Chapter 1 Introduction to Process Control Dr. Bassam Kahhaleh Princess Sumaya Univ. Electronic Engineering Dept.

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Presentation on theme: "3441 Industrial Instruments 1 Chapter 1 Introduction to Process Control Dr. Bassam Kahhaleh Princess Sumaya Univ. Electronic Engineering Dept."— Presentation transcript:

1 3441 Industrial Instruments 1 Chapter 1 Introduction to Process Control Dr. Bassam Kahhaleh Princess Sumaya Univ. Electronic Engineering Dept.

2 Princess Sumaya University Industrial Instruments 12 / 20 Introduction to Process Control Objective Introduce the overall process-control loop, its function, and its description.

3 Princess Sumaya University Industrial Instruments 13 / 20 Introduction to Process Control Process-Control Principles The Process

4 Princess Sumaya University Industrial Instruments 14 / 20 Introduction to Process Control Process-Control Principles Human-Aided Control

5 Princess Sumaya University Industrial Instruments 15 / 20 Introduction to Process Control Process-Control Principles Automatic Control

6 Princess Sumaya University Industrial Instruments 16 / 20 Introduction to Process Control Process-Control Block Diagram Control Element Process Measurement Controller b r e = r - b p

7 Princess Sumaya University Industrial Instruments 17 / 20 Introduction to Process Control Control System Evaluation Stability Stability Does the system become unstable, especially after reacting to a disturbance or other changes? Steady-State Regulation Steady-State Regulation Transient Regulation Transient Regulation

8 Princess Sumaya University Industrial Instruments 18 / 20 Introduction to Process Control Control System Evaluation Evaluation Criteria Evaluation Criteria Damped Response Damped Response Cyclic Response Cyclic Response

9 Princess Sumaya University Industrial Instruments 19 / 20 Introduction to Process Control Analog & Digital Processing Data Representation Data Representation Analog Data Analog Data Digital Data (Binary) Digital Data (Binary) Data Conversion Data Conversion ADC ADC DAC DAC Resolution & Speed Resolution & Speed

10 Princess Sumaya University Industrial Instruments 110 / 20 Introduction to Process Control ON/OFF Control Control Element is either ON or OFF Control Element is either ON or OFF Relays Relays Mechanical Mechanical Solid-State Solid-State

11 Princess Sumaya University Industrial Instruments 111 / 20 Introduction to Process Control ON/OFF Control Relays Relays Mechanical Mechanical

12 Princess Sumaya University Industrial Instruments 112 / 20 Introduction to Process Control ON/OFF Control Relays Relays Mechanical Mechanical

13 Princess Sumaya University Industrial Instruments 113 / 20 Introduction to Process Control ON/OFF Control Relays Relays Mechanical Mechanical

14 Princess Sumaya University Industrial Instruments 114 / 20 Introduction to Process Control ON/OFFControl

15 Princess Sumaya University Industrial Instruments 115 / 20 Introduction to Process Control Analog Control Heater Q Oven Measurement Controller VTVT VrVr V e = V r - V T VQVQ T Error detector

16 Princess Sumaya University Industrial Instruments 116 / 20 Introduction to Process Control Digital Control Supervisory Control Supervisory Control Heater Q Oven Measurement Controller VTVT VrVr V e = V r - V T VQVQ T Error detector Computer ADC DAC

17 Princess Sumaya University Industrial Instruments 117 / 20 Introduction to Process Control Digital Control Direct Digital Control (DDC) Direct Digital Control (DDC) Heater Q Oven Measurement DAC VTVT NTNT VQVQ T Computer ADC NQNQ

18 Princess Sumaya University Industrial Instruments 118 / 20 Introduction to Process Control Programmable Logic Controllers (PLC) Inputs & Outputs are AC level Inputs & Outputs are AC level PLC LL NN

19 Princess Sumaya University Industrial Instruments 119 / 20 Introduction to Process Control Sensor Time Response First-Order Response First-Order Response b (t ) = b i + (b f – b i ) [ 1 – e – t / ] Second-Order Response Second-Order Response R (t ) R o e – t sin (2 f n t )

20 Princess Sumaya University Industrial Instruments 120 / 20 End of Chapter 1 Introduction to Process Control


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