CONTROL SYSTEMS AND PLC – For Diploma in Electronics Engineering – Semester 5 | Vijay Yangalwar | Nirali Prakashan

1. Basics of Control System                                                        (Hrs. 10; Marks 12)

1.1   Control Systems : Basics of Control System, Block Diagram and Practical Examples

1.2   Classification of Control Systems : Open loop and Closed loop Systems – Block Diagram, Practical Example and Comparison, Linear and Non-linear Systems, Time Varying and Time Invarying Systems – Practical Example and Comparison. Servo System

1.3   Transfer Function : Closed loop and Open loop System – RC, LC and RLC Circuits – Differential Equations and Transfer Functions and Analysis using Laplace Transform

1.4   Block Diagram Reduction Technique : Need, Reduction Rules

2. Time Domain Stability Analysis (Hrs. 16; Marks 16)              

2.1   Time Response : Transient and Steady State Response

2.2   Standard Test Inputs : Step, Ramp, Parabolic Impulse and their corresponding Laplace Transform

2.3   Analysis of First and Second Order Control System :

   (i)   Poles and Zeros : s-plane Representation, Order of System (0, 1, 2) – Standard Equations, Examples and Numerical Problems

(ii)  First Order System : Analysis for Unit Step Input, Concept of Time Constant

(iii) Second Order System : Analysis for Unit Step Input (No Derivation), Concept, Definition and Effect of Damping

(iv) Time Response Specifications (No Derivations) : t_p, t_s, t_r, t_d, m_p, e_ss, Numerical Problems

2.4   Steady State Analysis : Type 0, 1, 2 Systems-Steady State Error and Error Constants, Numerical Problems

2.5   Stability : Concept of Stability, Root Locations in s-plane and Analysis – Stable System, Unstable System, Critically Stable Systems, Conditionally Stable System, Relative Stability

2.6   Routh’s Stability Criterion : Steps and Procedures to find Stability to Routh’s Stability Criteria

3. Process Controllers                                                  (Hrs. 08; Marks 10)

3.1   Process Control System : Block Diagram, Functions of Each Block

3.2   Control Actions :

            (i) Discontinuous Mode : ON-OFF Controllers – Equation, Neutral Zone

(ii) Continuous Modes : Proportional Controller – Offset, Proportional Band, Proportional, Integral and Derivative Controllers – Output Equation, Response, Characteristics

3.3   Composite Controllers : PI, PD, PID Controllers – Output Equation, Response

4. Fundamentals of PLC                                                        (Hrs. 12; Marks 14)         

4.1   PLC – Block Diagram, Classification (Fixed and Modular PLCs), Need and Benefits of PLC in Automation

4.2   Description of Different Parts of PLC : CPU – Function, Scanning Cycle, Speed of Execution, Power Supply – Block Diagram and Function of Each Block.

Memory – Function and Organization of ROM and RAM. Input and Output Modules – Function, Different Input and Output Devices of PLC (only names and their uses)

4.3   PLC Installation

5. PLC Hardware and Programming (Hrs. 18; Marks 18)

5.1   Discrete Input Modules : Block Diagram, Specifications of AC Input Modules and DC Input Module. Sinking and Sourcing Concept in DC Input Modules

5.2   Discrete Output Modules : Block Diagram, Description and Specifications of AC Output Module and            DC Output Modules

5.3   Analog Input and Output Modules : Block Diagram, Specifications

5.4   Input/Output Addressing of PLC : Addressing Data Files, Format of Logical Address, Different Addressing Types

5.5   PLC Instruction Set : Relay Instructions, Timer and Counter Instructions, Data Movement Instructions, Logical and Comparison Instructions

5.6   PLC Programs Using Ladder Programming Language