The document provides information about programmable logic controllers (PLCs) and distributed control systems (DCSs). It discusses the history and components of PLCs, including the central processing unit, input and output modules, power supply, and programming languages. DCSs are described as systems that divide plant control into areas managed by individual controllers connected by a communication network. Key advantages of DCSs include reliability, redundancy, flexibility in configuration, and ease of maintenance. The document compares PLCs and DCSs, noting that DCSs are more suitable for large-scale, complex plant control applications.
Distributed Control Systems (DCS) are dedicated systems used to control manufacturing processes that are continuous or batch-oriented, such as oil refining, petrochemicals, central station power generation, fertilizers, pharmaceuticals, food and beverage manufacturing, cement production, steelmaking, and papermaking. DCSs are connected to sensors and actuators and use set point control to control the flow of material through the plant.
The most common example is a set point control loop consisting of a pressure sensor, controller, and control valve. Pressure or flow measurements are transmitted to the controller, usually through the aid of a signal conditioning input/output (I/O) device. When the measured variable reaches a certain point, the controller instructs a valve or actuation device to open or close until the fluidic flow process reaches the desired set point.
Large oil refineries have many thousands of I/O points and employ very large DCSs. Processes are not limited to fluidic flow through pipes, however, and can also include things like paper machines and their associated quality controls (see quality control system QCS), variable speed drives and motor control centers, cement kilns, mining operations, ore processing facilities, and many others.
Innovic India Private Limited provides industrial Training on DCS as well as other automationtechnologies like PLC, SCADA, HMI, VFD and many more.
For Core Engineering jobs and 100% Job Oriented Industrial Training
Feel free to contact us on: +91-9555405045/+91-9811253572
Email: group.innovic2gmail.com
Web: www.innovicindia.com
Programmable logic controllers (PLCs) have been an integral part of factory automation and industrial process control for decades. PLCs control a wide array of applications from simple lighting functions to environmental systems to chemical processing plants. These systems perform many functions, providing a variety of analog and digital input and output interfaces; signal processing; data conversion; and various communication protocols. All of the PLC's components and functions are centered around the controller, which is programmed for a specific task.
The basic PLC module must be sufficiently flexible and configurable to meet the diverse needs of different factories and applications. Input stimuli (either analog or digital) are received from machines, sensors, or process events in the form of voltage or current. The PLC must accurately interpret and convert the stimulus for the CPU which, in turn, defines a set of instructions to the output systems that control actuators on the factory floor or in another industrial environment
PowerPoint Presentation on Industrial Automation In which we discuss About PLCs, SCADA,HMI,VFD and various tools of Automation which is used in Industries.
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Distributed Control Systems (DCS) are dedicated systems used to control manufacturing processes that are continuous or batch-oriented, such as oil refining, petrochemicals, central station power generation, fertilizers, pharmaceuticals, food and beverage manufacturing, cement production, steelmaking, and papermaking. DCSs are connected to sensors and actuators and use set point control to control the flow of material through the plant.
The most common example is a set point control loop consisting of a pressure sensor, controller, and control valve. Pressure or flow measurements are transmitted to the controller, usually through the aid of a signal conditioning input/output (I/O) device. When the measured variable reaches a certain point, the controller instructs a valve or actuation device to open or close until the fluidic flow process reaches the desired set point.
Large oil refineries have many thousands of I/O points and employ very large DCSs. Processes are not limited to fluidic flow through pipes, however, and can also include things like paper machines and their associated quality controls (see quality control system QCS), variable speed drives and motor control centers, cement kilns, mining operations, ore processing facilities, and many others.
Innovic India Private Limited provides industrial Training on DCS as well as other automationtechnologies like PLC, SCADA, HMI, VFD and many more.
For Core Engineering jobs and 100% Job Oriented Industrial Training
Feel free to contact us on: +91-9555405045/+91-9811253572
Email: group.innovic2gmail.com
Web: www.innovicindia.com
Programmable logic controllers (PLCs) have been an integral part of factory automation and industrial process control for decades. PLCs control a wide array of applications from simple lighting functions to environmental systems to chemical processing plants. These systems perform many functions, providing a variety of analog and digital input and output interfaces; signal processing; data conversion; and various communication protocols. All of the PLC's components and functions are centered around the controller, which is programmed for a specific task.
The basic PLC module must be sufficiently flexible and configurable to meet the diverse needs of different factories and applications. Input stimuli (either analog or digital) are received from machines, sensors, or process events in the form of voltage or current. The PLC must accurately interpret and convert the stimulus for the CPU which, in turn, defines a set of instructions to the output systems that control actuators on the factory floor or in another industrial environment
PowerPoint Presentation on Industrial Automation In which we discuss About PLCs, SCADA,HMI,VFD and various tools of Automation which is used in Industries.
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In this session you will learn:
DCS Introduction
PLC
SCADA
General architecture of DCS
Process or application
Scan time
Input and Output requirement
Redundancy
RTU and LCU
PLC vs DCS
For more information, visit: https://www.mindsmapped.com/courses/industrial-automation/complete-training-on-industrial-automation-for-beginners/
Seminar Presentation on Programmeble Logic Controller , By an Engineering Student For doing Professional Presentation like Business Presentation, Industrial Use
Introduction of SCADA, Architecture of SCADA, Software and hardware architecture, Components of a SCADA system, Functions of SCADA, Alarms and events, alarm logging, comparision between scada and DCS
PLC Ladder Diagram basics, with two solved examples
For more information go to
http://shrutizpresentations.blogspot.in/2014/04/plc-ladder-diagram-basics.html
A Power Point presentation On INDUSTRIAL AUTOMATION...
What is Automation?
As the name suggests ‘Automation’ means to perform automatic operations by means of different kinds of machines.
Automation is the use of control systems and information technologies to reduce the need for human work in the production of goods and services.
It is used to reduce human interference and efforts
Advantages Of PLC:-
Less Wiring.
Wiring between devices and relay contacts are done in the PLC program.
Easier and faster to make changes.
Trouble shooting aids make programming easier and reduce downtime.
Reliable components make these likely to operate for years before failure.
PLC is an industrial computer designed for multiple inputs and output arrangements. It is capable of storing the instructions to implement control functions such as sequencing, timing, counting, arithmetic, data manipulation and communication.
This PPT is based on the communication between a PLC and a SCADA system. The numerous communication protocols such as Modbus, Profibus, ControlNET, DeviceNET, HART, Ethernet, and Profinet are briefly explained in this ppt.
In this session you will learn:
DCS Introduction
PLC
SCADA
General architecture of DCS
Process or application
Scan time
Input and Output requirement
Redundancy
RTU and LCU
PLC vs DCS
For more information, visit: https://www.mindsmapped.com/courses/industrial-automation/complete-training-on-industrial-automation-for-beginners/
Seminar Presentation on Programmeble Logic Controller , By an Engineering Student For doing Professional Presentation like Business Presentation, Industrial Use
Introduction of SCADA, Architecture of SCADA, Software and hardware architecture, Components of a SCADA system, Functions of SCADA, Alarms and events, alarm logging, comparision between scada and DCS
PLC Ladder Diagram basics, with two solved examples
For more information go to
http://shrutizpresentations.blogspot.in/2014/04/plc-ladder-diagram-basics.html
A Power Point presentation On INDUSTRIAL AUTOMATION...
What is Automation?
As the name suggests ‘Automation’ means to perform automatic operations by means of different kinds of machines.
Automation is the use of control systems and information technologies to reduce the need for human work in the production of goods and services.
It is used to reduce human interference and efforts
Advantages Of PLC:-
Less Wiring.
Wiring between devices and relay contacts are done in the PLC program.
Easier and faster to make changes.
Trouble shooting aids make programming easier and reduce downtime.
Reliable components make these likely to operate for years before failure.
PLC is an industrial computer designed for multiple inputs and output arrangements. It is capable of storing the instructions to implement control functions such as sequencing, timing, counting, arithmetic, data manipulation and communication.
This PPT is based on the communication between a PLC and a SCADA system. The numerous communication protocols such as Modbus, Profibus, ControlNET, DeviceNET, HART, Ethernet, and Profinet are briefly explained in this ppt.
This Presentation can be used by the Students of Engineering who Deals with the Subject ELECTRICAL MACHINES and use it for Refrence (Anyways you Guys will Copy Paste or Download it) ;)
Tamil Nadu, Agricultural Engineering Department, Agricultural Machinery Training Centre, Tiruchirapalli,Training on Newly Developed Agricultural Machinery & Equipments,(Past & Present) - An 'U' Turn Look by Coomarasamy. C, Formerly EE, AED
Electromagnetic Interference and Electromagnetic Compatibility (EMI/EMCAishwary Singh
• Characterizing the threat
• Setting standards for emission and susceptibility levels
• Testing of Equipment on heavy Vibrations
• Testing for standards compliance
For queries,
Aishwarya
palsinghaishwarya@gmail.com
A Programmable Logic Controller (PLC) or Programmable Controller is an electronic device used for Automation of industrial processes, such as control of machinery on factory assembly lines.
In todays world, PLC is heart and brain of all industries no matter which segment it is. It has changed the face of technology and way of work. Hear i am sharing just the basic and the evolution of PLC.
This is a small project on Siemens PLC Step 7 models. The project required lot of lateral thinking and logical decision making in order to develop programs for the traffic light management for the entire chandigarh city. The project is known as Total Traffic Security & Management (TTSM)
Training report prepared on PLC on CNC at BHEL,Hyderabad. It have sufficient slides to know the basics about PLC on CNC and working of that with coding. It was worth learning on BHEL.
Implementation of T-Junction Traffic Light Control System Using Simatic S7-20...IJERA Editor
A conventional traffic light control system is designed by using devices such as timers, relays and
contactors etc. The critical timing operation is required to be carried out under the existence of heavy
traffic situations. This conventional practice leads to many problems that need additional maintenance
cost and subsequent delay for a long time. With the help of a PLC, the requirement of fast automation
and effective optimization of traffic light control system can be achieved. Use of PLC helps us to
develop this process not only for traffic signal on the roads, but also on the movement of trains and
the transfer of containers in ports in maritime works. In order to provide a solution to the above
problem, this paper introduces an execution and implementation of T-junction traffic control system
using SEIMENS S7-200 PLC. Programming in PLC is written in ladder logic with the help of STEP7
MICROWIN software
Basics and applications of programmable logic controller (plc)Ali Altahir
PLC is a multipurpose clock-driven memory-based electronic device which is also known as a specialized industrial computer which deals with different level of complexity and control system.
Saudi Arabia stands as a titan in the global energy landscape, renowned for its abundant oil and gas resources. It's the largest exporter of petroleum and holds some of the world's most significant reserves. Let's delve into the top 10 oil and gas projects shaping Saudi Arabia's energy future in 2024.
Event Management System Vb Net Project Report.pdfKamal Acharya
In present era, the scopes of information technology growing with a very fast .We do not see any are untouched from this industry. The scope of information technology has become wider includes: Business and industry. Household Business, Communication, Education, Entertainment, Science, Medicine, Engineering, Distance Learning, Weather Forecasting. Carrier Searching and so on.
My project named “Event Management System” is software that store and maintained all events coordinated in college. It also helpful to print related reports. My project will help to record the events coordinated by faculties with their Name, Event subject, date & details in an efficient & effective ways.
In my system we have to make a system by which a user can record all events coordinated by a particular faculty. In our proposed system some more featured are added which differs it from the existing system such as security.
Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
CFD Simulation of By-pass Flow in a HRSG module by R&R Consult.pptxR&R Consult
CFD analysis is incredibly effective at solving mysteries and improving the performance of complex systems!
Here's a great example: At a large natural gas-fired power plant, where they use waste heat to generate steam and energy, they were puzzled that their boiler wasn't producing as much steam as expected.
R&R and Tetra Engineering Group Inc. were asked to solve the issue with reduced steam production.
An inspection had shown that a significant amount of hot flue gas was bypassing the boiler tubes, where the heat was supposed to be transferred.
R&R Consult conducted a CFD analysis, which revealed that 6.3% of the flue gas was bypassing the boiler tubes without transferring heat. The analysis also showed that the flue gas was instead being directed along the sides of the boiler and between the modules that were supposed to capture the heat. This was the cause of the reduced performance.
Based on our results, Tetra Engineering installed covering plates to reduce the bypass flow. This improved the boiler's performance and increased electricity production.
It is always satisfying when we can help solve complex challenges like this. Do your systems also need a check-up or optimization? Give us a call!
Work done in cooperation with James Malloy and David Moelling from Tetra Engineering.
More examples of our work https://www.r-r-consult.dk/en/cases-en/
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
Industrial Training at Shahjalal Fertilizer Company Limited (SFCL)MdTanvirMahtab2
This presentation is about the working procedure of Shahjalal Fertilizer Company Limited (SFCL). A Govt. owned Company of Bangladesh Chemical Industries Corporation under Ministry of Industries.
TECHNICAL TRAINING MANUAL GENERAL FAMILIARIZATION COURSEDuvanRamosGarzon1
AIRCRAFT GENERAL
The Single Aisle is the most advanced family aircraft in service today, with fly-by-wire flight controls.
The A318, A319, A320 and A321 are twin-engine subsonic medium range aircraft.
The family offers a choice of engines
Student information management system project report ii.pdfKamal Acharya
Our project explains about the student management. This project mainly explains the various actions related to student details. This project shows some ease in adding, editing and deleting the student details. It also provides a less time consuming process for viewing, adding, editing and deleting the marks of the students.
3. What is PLC?
PLC is a Programmable Logic Controller and also
a kind of a digital computer which can be
Programmed as per the process which is needed
to be controlled, designed for multiple inputs
and output arrangements, having immunity to
electrical noise and resistance to vibration and
impact.
4. History of PLC
PLC was introduced in late 1960’s
First commercial & successful Programmable Logic
Controllers was designed and developed by Modicon
as a relay replacer for General Motors.
Earlier, it was a machine with thousands of electronic
parts.
Later ,in late 1970’s,the microprocessor became reality &
greatly enhanced the role of PLC permitting it to evolve
form simply relay to the sophisticated system as it is today.
5. Major Components of a PLC
CENTRAL
PROCESSING
UNIT (CPU)
POWER
SUPPLY
I M
N O
P D
U U
T L
E
O M
U O
T D
P U
U L
T E
PROGRAMMING
DEVICE
From
SENSORS
Pushbuttons,
contacts,
limit switches,
etc.
To
OUTPUT
Solenoids,
contactors,
alarms
etc.
Handheld Device
or Computer
etc.
7. Major Components of a PLC
Central Processing Unit
It is a micro-controller based circuitry. The CPU consists of
following blocks :
Arithmetic Logic Unit (ALU), Program memory, Process image
memory (Internal memory of CPU), Internal timers and
counters.
CPU performs the task necessary to fulfill the PLC funtions.
These tasks include Scanning, I/O bus traffic control, Program
execution, Peripheral and External device communication,
special functions or data handling execution and self
diagnostics.
8. Input module
These modules act as interface between real-time status of
process variable and the CPU.
Analog input module : Typical input to these modules is 4-20
mA, 0-10 V
Example : Pressure, Flow, Level Tx, RTD (Ohm),
Thermocouple (mV)
Digital input module : Typical input to these modules is 24 V
DC, 115 V AC, 230 V AC
Ex. : Switches, Pushbuttons, Relays, pump valve on off
status
9. Output module
These modules act as link between the CPU and the output
devices in the field.
Analog output module : Typical output from these modules is
4-20 mA, 0-10 V
Ex : Control Valve, Speed, Vibration.
Digital output module : Typical output from these modules is
24 V DC, 115 V AC, 230 V AC
Ex. : Solenoid Valves, lamps, Actuators, dampers, Pump
valve on off control
10. Power Supply
The power supply gives the voltage required for electronics
module (I/O Logic signals, CPU, memory unit and peripheral
devices) of the PLC from the line supply.
The power supply provides isolation necessary to protect the
solid state devices from most high voltage line spikes.
As I/O is expanded, some PLC may require additional power
supplies in order to maintain proper power levels.
11. Bus System
It is path for the transmission of the signal . Bus system is
responsible for the signal exchange between processor and I/O
modules.
The bus system comprise of several single line i.e. wires /
tracks
12. PLC operation sequence
1) Self test: Testing of its own hardware and
software for faults.
2) Input scan: If there are no problems, PLC
will copy all the inputs and copy their values
into memory.
3) Logic solve/scan: Using inputs, the ladder
logic program is solved once and outputs are
updated.
4) Output scan: While solving logic the output
values are updated only in memory when
ladder scan is done, the outputs will be
updated using temporary values in memory.
Self test
Input scan
Logic scan
Output
scan
13. Programming Languages of PLC
Most common languages encountered in PLC
programming are:
1) Ladder Logic
2) Functional Block Diagram
3) Sequential Function Chart
14. Ladder Logic
The ladder logic is the oldest programming language for
PLC.
It is well suited to express Combinational logic.
The main ladder logic symbols represent the elements :
make contact
break contact
relay coil
21. PLC Selection Criteria
Cost of hardware, software, Integration Engineering, Design, Installation,
Start-up and Commissioning, Validation documentation and Execution,
Training, Spare parts, Maintenance, System service contract and system
life cycle.
Reliability, Flexibility, Scalability and Validatability.
Ease of Database configuration, Graphics development, Interlocks and
Batch processing.
Integration of High-level Application.
Control Philosophy for Centralized versus Remote Operator Console or
both.
22. Advantages of PLCs:
Reliability.
Flexibility in programming and reprogramming.
Cost effective for controlling complex systems.
Small physical size, shorter project time.
High speed of operation.
Ability to communicate with computer systems in
the plant.
Ease of maintenance /troubleshooting.
Reduced space.
Energy saving.
23. Disadvantages of PLCs
PLC devices are proprietary it means that part
or software of one manufacturer can’t be used
in combination with parts of another
manufacturer.
Limited design and cost option
Fixed Circuit Operations.
PLCs manufacturers offer only closed
architectures.
24. Applications:
Wherever automation is desired the PLCs are best
suited to meet the task.
Few examples of industries where PLCs are used :
1) Robots : manufacturing and control
2) Car park control
3) Train control station system
4) Food processing
5) Materials handling
6) Machine tools
7) Conveyer system etc.
26. Distributed control system (DCS)
DCS is a system of dividing plant or process control into
several areas of responsibility, each managed by its own
controller, with the whole system connected to form a
single entity, usually by means of communication buses.
Distributed Control System (DCS) refers to a control
system usually of a manufacturing system, process or any
kind of dynamic system, in which the controller elements
are not central in location (like the brain) but are
distributed throughout the system with each component
sub-system controlled by one or more controllers. The
entire system of controllers is connected by networks for
communication and monitoring.
The entire system of controllers is connected by networks
for communication and monitoring.
27. Why it is called DISTRIBUTED???
As is apparent from the abbreviation, the word ‘Distributed’
supports following functionality’s
Physical Distribution - Nodes or Subsystems can be
Distributed i.e. located physically apart
Functional Distribution - Specific Functionality is imparted
for a Node basing on the combination of hardware and
software used. For e.g. Application work-processor with
Historian, Application work-processor with control
configuration software
Structural Distribution - Different Structural hardware
platforms (Application Workstation processor, Workstation
processor, Control processor etc.) are used to achieve the
required functionality.
28. What does DCS System consists of?
DCS System consists minimum of the following components.
Field Control station (FCS): It consists of input/output modules, CPU and
communication bus.
Operator station: It is basically human interface machine with monitor,
the operator man can view the process in the plant and check if any alarm is
presents and he can change any setting, print reports..etc...
Engineering station: It is used to configure all input & output and drawing and
any things required to be monitored on Operator station monitor.
32. Digital Control System
Drawbacks Of CCS:
If the CPU fails the entire plant gets affected.
Redundancy concept is not available.
Redundancy is having two controllers. One would be active and the
other would be standby. If the active controller fails, the standby
controller takes over.
34. How does it work?
Example of simple control mechanism
Process measured value (PV)
Manipulated value (MV)
Set Value (SV).
35. Operation Windows
Information regarding the process is gathered as well as
monitored by the following Standard Operation windows :
Tuning Window
Control Group Window
Trend Window
Process Alarm Window
Operator guide Message Window
Graphic Window
Overview Window
Process Report Window
Historical Report Window
36. Control function is distributed among multiple CPUs
(Field Control Stations). Hence failure of one FCS does
not affect the entire plant.
Redundancy is available at various levels.
Instruments and interlocks are created by software.
Generation and modifications of the interlocks are very
flexible and simple.
Information regarding the process is presented to the
user in various formats.
Field wiring is considerably less.
Maintenance and trouble shooting becomes very easy.
Cost effective in the long run.
Advantages of DCS
37. WHY DCS ?
For Total Plant Automation
For Higher Productivity
For Optimal Process Control
For Advance Process Control
For Regulatory Compliance
For Management Information System
In Tune With Global Requirement
38. DCS MANUFACTURERS
ASEA BROWN BOWERI - ABB
TATA HONEYWEL
FOXBORO - INVENSYS
YOKOGOWA BLUE STAR - YBL
ALLEN BRADLEY
GE FANUC
FISHER ROSEMOUNT
TOSHIBA
METSO Automation
40. Difference Between PLC & DCS
A PLC is cost-effective up to a certain I/O count, and so is the
DCS. But the difference is in their starting points: the PLC is
cost-effective from 0 to a few thousand I/O points; the DCS
becomes cost-effective starting from a few thousand points and
beyond.
A PLC becomes a subsystem of the DCS in rare occasions when
the situation calls for it, i.e., purchase of huge package systems
with engineering schedules incompatible with the DCS schedule
(I/O lists cannot be submitted on time before the DCS hardware
freeze date). Note that this package system is a process system
using continuous control, not discrete. Based on this, a PLC can
never be larger than a DCS in terms of I/O count.
In large plants the DCS is king because most owners want a single
source of hardware support and service, and this mentality
naturally denies the PLC a foothold. Package vendors are no
longer required to provide PLC for their system. Everything is
connected to the DCS.
41. Difference Between PLC & DCS Cont…
Generally, PLCs are stand alone and perform a particular task,
where a DCS is a network of PLCs that communicate in some
fashion to accomplish a particular task. For example, in a water
filtration plant, there might be a PLC that is used to perform a
backwash of a particular filter, in that same water plant a DCS
may be communicating with 14 filter PLCs and starting the
backwash routine when required.
PLC only handle sequential process than DCS can handled both
Continue process and large loop control.
If we see from security angle, PLC doesn't have dongle so people
can crack the software easy. DCS have a dongle so it's only
license to industry which have it.
PLC is a programmable Logic controller which is used mainly for
interlocking different equipment’s. DCS is Distributed Control
Systems which is used to control very big plants by using simple
GUI screens. PLCs are interfaced with DCS for interlocking.