[Music] foreign
[Music] PLC is also known as programmable logic controllers are digital computers
used in Industrial Automation to Monitor and control various processes
they were introduced in the late 1960s by Bedford Associates with their modicon device
which replaced electromechanical relays with solid-state digital computers
this Innovation is streamlined the Control process making it faster more reliable and easier to
program the modicon084 was the first PLC and a game changer in Industrial Automation [Music]
the world of Industrial Automation the programmable logic controller
or PLC has become an essential tool for controlling complex processes and machinery
plcs are integral part of modern Industrial Automation controlling everything from assembly
line Machinery to complex chemical processes but why do we need plcs let's find out one of the most
significant advantages of plcs is increased productivity they can automate repetitive
tasks reducing the need of human intervention and increasing productivity plcs can increase
efficiency and save cost by optimizing processes reducing waste energy consumption and downtime
another advantage of PLC is flexibility they can be programmed and reprogrammed easily to
adopt to change process requirements or to introduce new products or processes
the next Advantage is accuracy PLC can perform calculations and make decisions with precision
and accuracy reducing the risk of human error finally plcs can ensure the safety
by controlling machines and processing in a safe and reliable manner to prevent accidents [Music]
a PLC is a specialized computer system designed for industrial control applications it consists
of four primary components the CPU memory power supply and IO modules the CPU is the brain of
the PLC receiving input signals from connected input modules and Performing programmed logic
and calculations the resulting output signals are sent to Output modules which control devices
like Motors and walls PLC memory is part of the PLC which stores data programs and information
the process of adding new information into memory is called writing and the
process of retrieving information from a memory location is called reading the major types of
memory which are used in the PLC are read-only memory or ROM and random access memory or Ram
we can only read the ROM location but it can be written the ROM would have programs and data
which should not be edited like the operating programs the ram location can be used to do
the reading and writing by this we can edit or change the information stored in the ram
another component is the i o modules which are responsible for interfacing the PLC with the
outside world there are different types of i o modules to accommodate different types of signals
and devices some are designed for digital signals While others handle analog signals
some i o modules have built-in safety features to protect workers and equipment the power supply for
the programmable logic controller converts the input source power into voltages required for
internal circuits in some cases it also provides an isolated VDC Supply to power DC input circuits
switches and other indicators the power supply of the PLC is an essential component to run the plc
in addition to the four primary components mentioned earlier each particular model of
PLC also includes other components that we will explore in upcoming video series [Music]
have you ever wondered how plcs operate well there are four basic steps in the operation of
all plcs input scan program scan output scan and housekeeping these steps continually take place in
a repeating Loop input scan in this step the state of all input devices that are connected to the PLC
is detected the second step is the program scan this step executes the user created program logic
now the third is output scan this step energizes or de-energizes all output
devices that are connected to the plc number four housekeeping this step includes communication with
programming terminals internal Diagnostics Etc let's take an example of how to control
an electric motor using a button firstly we will connect a button to the input of the PLC
the PLC will be programmed to receive a signal from the button whenever the button is pressed
the PLC will receive the signal and activate an output module this output module will then send
a signal to the electric motor making it run the PLC will continue to control the electric motor
until it receives a signal that the button is no longer being pressed when the button
is released the PLC will detect the signal and stop the electric motor from running
this is a basic demonstration where the PLC serves as a controller that oversees the
input signal from a button and adjusts the output signal to the motor depending on the input signal
although this is a simple example it highlights the fundamental operation of plcs in a reality
plcs can be used to control much more complex processes in Industrial Automation
and that's the wrap up for our PLC introduction I hope you found this video informative and useful
in understanding the basics of plc but this is just the beginning in the upcoming video series
we will be diving deeper into several widely used PLC models bike manufacturers such as
Siemens Schneider ABB and more once again thank you for watching this video we hope
you have learned something new and valuable see you in the next video take care [Music]