ACKNOWLEDGEMENT

I thank JIS for giving Opportunity to do this training.

I adorn my sincere thanks & gratefulness to the DEPARTMENT of EIE

For giving us an opportunity to pursue vocational training for partial fulfillment of B.TECH (EIE), their encouragement & help in the pursuit of my studies.

I am really thankful to Mr. ______ (MATHAMUNDU), ______ (MATHAMUNDU) & Mr. _________ (AJHKJD) who guided me to do the project in

iCyse .inc in a successful manner.

Feel a Sense of happiness in thanking all the employees of iCyse Network for the help rendered the patience & support they gave during my project work.

I am extremely grateful to all the respondents who spent their Valuable time to answer my questions.

1. INTRODUCTION

Write your own TextINDEX:

SECTION A:1. GENERAL OVERVIEW OF PLC – Given below, edit if you like

A. SIEMENS

Write your own text

(Hardware platform – S7 300, Software platform – STEP 7, HMI - WinCC)

2. FACTORY VISIT

Write your own text(PLC Panel – Visual observation, system info, continuity check, Control Desk/Post)

SECTION B: AUTOMATION PROJECT ON A BOTTLING PLANT PROCESS

A. PROJECT OBJECTIVEB. LOGIC WRITE UPC. LADDER PROGRAME. HMI SCREEN SHOTS

SECTION A

1. WHAT IS INDUSTRIAL AUTOMATION

Industrial Automation is the use of Control Systems to control Industrial Machinery and Processes, reducing the need for human intervention.

If we compare a job being done by human and by Automation, the physical part of the job is replaced by use of a Machine, whereas the mental capabilities of the human are replaced with the Automation.

The human sensory organs are replaced with electrical, mechanical or electronic Sensors to enable the Automation systems to perform the job.

For example, a grinding wheel driven by a human can be replaced by a motor (which is a machine). But starting and stopping the grinding, which were done by the human by ‘looking at’ the output, will be replaced by the control of the motor by Automation.

Higher level of human intelligence like planning, analysis, prediction and intuitive decision making is not done by this Level of Automation.

Automation compared to human activity

HUMAN BRAIN

SENSORY ORGANSLIMBS TO DO

THE WORK

AUTOMATION

SENSORS

IN FIELD

CONTROL OF MACHINES & DEVICES

CONTROL SYSTEMS USED IN INDUSTRIAL AUTOMATION

• Micro-controllers

• Programmable (Logic) Controllers or PLC

• Distributed Control System or DCS

• Computers, etc.

WHAT IS PROGRAMMABLE (LOGIC) CONTROLLER

Programmable (Logic) Controller or PLC is a type of computer commonly used in commercial and industrial control applications.

The prominent manufacturers of PLC are Allen-Bradley (Rockwell), Siemens, GE Fanuc, Schneider Electric, Mitsubishi, etc.

HOW IS PLC DIFFERENT FROM COMMON COMPUTERS

The PLC and computers are different in their hardware and software as their target application and solution areas are different. While the computer is required to do many activities simultaneously or compute and handle huge amount of data, the PLC is required to interact with the process and focus on controlling a physical process reliably, which means, common PC syndromes like hang, crash or reboot can not be tolerated for a PLC.

Hence, the difference can be summarized as follows:

The number of simultaneous processes handled by PC is more than PLC

PC is faster in terms of processor speed and data handling capacity

PLC has higher capability of handling external input output signals, specially discreet input and outputs

The PLC is more reliable, repetitive and precise for a particular job

PLCs are very rugged and designed to work under harsh ambient conditions

PLC hardware is generally modular and expandable

PLC is essentially a Real Time System

REAL TIME SYSTEM

A system is a Real Time System when it can respond to an external event within a specified window of time.

Responses can be periodic, time-initiated, input driven or interrupt driven. The time is determined by the time constant of the dynamic process.

Example of time constants for external processes:

• Milliseconds for machining or electric power systems

• Seconds for flow / pressure processes

• Minutes for temperature controlled processes

• Weeks/months/years for social / economic processes

LEVELS OF AUTOMATION

Automation can be categorized in various levels based on the required intelligence level. In relation to the human capabilities, both physical and mental, each level relates to a particular capability.

The definition of levels is not unique and is available in 3 Level, 4 Level, 5 level models. One of the commonly used models is described below.

Process Automation

MES

ERP Level 4

Level 3

PLC, DCS,

HMI, SCADA

FOCUS ON PROCESS & CONTROL

Level 2

Level 1

Level 0Sensors

Drives

FOCUS ON MANAGEMENT

Levels of Automation

COMPONENTS OF PLC

A PLC consists of minimum the following components:

Central Processing Unit (CPU)

Memory

Power Supply

Rail / Rack

Input Modules

Output Modules

Power Supply

CPUMEMORY

INPUT OUTPUT

PROGRAMMING TERMINAL

RAIL / RACK

Components of PLC

CPU

The CPU is the “Brain” of the PLC. It essentially performs the following functions:

Updating the Input / Output status

Scanning the application program

Perform all binary (logical) and arithmetic functions as per the inputs and the application program and generate output

Communicate with Memory and Programming Terminal to read or write program or data

The CPUs are categorized primarily based on their Input/Output handling, special functions and communication capabilities.

The operating system of the CPU is permanently written in the same. Unlike personal computers, the hardware and the OS, as well as the programming software, are always from the same manufacturer.

Memory

The Memory stores the operating system, the application program and sometimes user data. Depending on the type of data to be stored, memory can be Read-Only type or ROM. Operating systems of the CPU are stored in such memory areas. The user program is generally stored in a Read-Write memory or RAM.

Memory can be built in the CPU or can be external. External memory is normally of Flash EPROM type. The RAM is normally backed up by the Battery provided in the PLC in case of power failure.

Power Supply

The Power Supply provides power to the CPU, Memory and the Input / Output modules. This is the power required by the electronics of the modules to function and NOT the field power required for the input / outputs.

Rail / Rack

The modules of a PLC are either mounted on a Rail or a Rack. While the Rail serves only as a mechanical support for the modules, the Rack serves both as a mounting support as well as a

backplane. The backplane is the PCB board, similar to the motherboard of a PC, on which modules are connected.

Input / Output Modules

If CPU is the “Brain” of the PLC, Inputs are the “Sensors”. The information acquired by the inputs is used by the CPU to generate outputs. Input / Outputs are of two types:

Digital

Analog

Digital Modules

Though the digital input and output modules vary through a wide range in terms of size and type, the following are their characteristics.

Digital input modules are used to read signals from selector switches, push buttons, limit switches, proximity switches, etc

Digital output modules switch on/off relays, contactors, lamps, etc.

Digital inputs and outputs can accept 24V DC, 48V DC, 120V AC or 240V AC. The entire module is for a particular voltage.

The number of inputs / outputs or channels available on a single module can be 8, 16, 32 or 64.

The most commonly used signal voltage level is 24V DC.

Types of Digital Inputs and Outputs

DIGITAL OUTPUTS

DIGITAL INPUTS

PLC

CPU

Analog Modules

The Analog Input modules are used to read signals from analog transducers, potentiometers, etc

Analog Output modules are used to give setpoints to drives or other processes or for displaying values on meters

Types of Analog Inputs and Outputs

The principle of operation of an analog module is based on the analog to digital converters or vice versa.

For analog input modules, the analog value connected to the terminals of the analog channel is converted into digital value by means of Analog to Digital Converter (ADC). The digital value is further processed for diagnostic data like overflow, wire breakage, etc. before being sent to the CPU via the backplane bus.

For analog output modules, the digital value generated by the CPU is sent to the analog module via the backplane bus for conversion into analog value by means of Digital to Analog Converter (DAC). The digital value is processed for diagnostic data like overflow, etc. before being sent to the DAC.

Analog Input Types

Analog Inputs are available in four types –

Voltage – 0-10V, +/-10V

ANALOGOUTPUTS

ANALOG INPUTS

PLC

CPU

Current – 0-20mA, 4-20mA

Resistance – Pt100, standard resistance (linear)

Thermocouple – J, K, N, L, etc.

CONFIGURATION OF PLC

PLC is a modular system can be configured in different ways:

Centralized

In Centralized configuration, the I/Os are located near the CPU or within a short distance from it. The input/outputs, irrespective of their physical location, are wired up to the PLC panel. This type of configuration is useful when the process is compact and concentrated and not spread across a long distance.

Centralized configuration of PLC

Remote I/O

In the Remote I/O configuration, the I/Os are distributed in smaller groups and located near the devices the signals are connected to. The communication between the CPU and the I/Os are established with the help of BUS system. The protocol of the communication is specific to the manufacturer of the PLC.

The advantages of the Remote I/O systems are as follows:

Savings in wiring cost as the I/Os are wired near the field devices and the major length of the cable is one single twisted pair cable.

Troubleshooting in field cable problems become easier.

Remote I/O stations are rugged and can be housed in control desks, control posts, MCC or other similar enclosures

Remote I/O configuration of PLC

PROGRAMMING BASICS

The user develops the Application Program on a Programmer and transfers the program to the CPU for execution.

Programming is done through a Programming Software Package, which is dependant on the manufacturer and the type of PLC used.

Almost all prominent PLC vendors have PLCs in Small, Medium and Large category. The categorization is done on the I/O handling and communication capacity.

Some of the CPUs come with a mode switch on it. At PROG position, only programming can be done, but outputs are not transferred. At REM position, both programming and execution is done. At RUN position, only program execution is done, no program transfer to the CPU is allowed.

The way of execution of the program in the CPU is based on the Type of Program it is written into.

Types of Programs

The application program running in a CPU can be categorized as per their type of execution –

Cyclic Program

Time Interrupt Program

Event Interrupt Program

Startup Program

The Cyclic Program is the main program of the PLC and is executed cyclically. The status of inputs from the field and the status of outputs by the PLC is updated once every cycle.

Cyclic Program Execution

The Time Interrupt Program is a section of the program which is triggered based on a time value. E.g., this part of the program is executed every 100 mS.

The Event Interrupt Program is triggered by an event, which can be either internal or external. It can be triggered by a hardwired signal or a fault or other internal event.

Startup Programs are executed during startup only and are not processed during normal running.

A. SIEMENS

Write your own text

(Hardware platform – S7 300, Software platform – STEP 7, HMI - WinCC)

3. FACTORY VISIT

Write your own text(PLC Panel – Visual observation, system info, continuity check, Control Desk/Post)

SECTION B – AUTOMATION PROJECT

PROJECT OBJECTIVE

To use a Programmable Logic Controller (PLC) to control A BOTTLING PLANT PROCESS develop the PLC software and HMI Screens for the system.

LOGIC WRITE UP

The Bottling Plant consists of the following

A) The Bottling Plant consists of two main stages : the filling stage and the capping stage.

B) The model Plant can handle five bottle at a time.

C) When start push button is pressed, a batch of five bottles are sent to the conveyor.The batch then proceeds towards the filling station.

D) The filling process takes about 10 secs to complete.

E) After the completion of the filling process the batch proceeds towards the capping station.

F) The capping takes few seconds to complete.

G) After the completion of the capping process, a mew batch of five bottles appears at the conveyor and the cycle begins again.

H) The entire cycle can be paused at any stage.Press the Pause button freezes the operation: bottles remain where they are and the counter keeps its last count.One morev press of the pause button restarts the system

I) Stop button causes the entire operation to stop.

LADDER PROGRAM

HMI SCREEN SHOTS