2. Welcome
The purpose of this Presentation is to
give you a very simple look
Programmable Logic Controllers and its
programming using Ladder Logic.
There is no need for you to be
familiar in any way with this field.
The only requirement is that you
enter with an open mind.
4. You may have come across the word
“automated” very usually!
5. Automation is the use of machines, control systems and information
technologies to monitor and control the production.
In other words, an automated system is any system
that require minimum or no human intervention.
8. So we can imply that with
Industrial control,
factory automation,
and PLC
(if are done well),
we can save a lot of time,
materials, energy, and money.
10. Let’s recall the story of an
explorer in Africa who asked
the native tribesman,
11. How does one eat a huge animal like an
elephant?"
The tribesman looked at the explorer in
astonishment and replied, "We eat it just like
everything else, one bite at a time."
12. Simple as it is, industrial control
is comprised of many smaller
circuits. By exploring and
learning simple smaller circuits,
you can learn to build a complete
automated system.
14. a small computer with a built-in operating system
which monitor inputs and other variable values,
make decisions based on a stored program, and
control outputs to automate a process or machine.
Programmable logic controllers
What is
15. Well, that was simple isn’t it ?
Lets put it in another way..
16. A PLC is similar to a computer which is designed to
be programmed once, and run repeatedly as needed.
19. Central Processor Unit (CPU)
microprocessor system that contains the system memory
and its decision making unit very similar to that of a
computer’s CPU.
Input Modules
Senses the input signal, isolates it and converts it to DC
level.
20. Output Module
receives the convert control signals from the CPU and
them converts them into digital or analog values that can
be used to control various output devices.
Central Processor Unit (CPU)
microprocessor system that contains the system memory
and its decision making unit very similar to that of a
computer’s CPU.
Input Modules
Senses the input signal, isolates it and converts it to DC
level.
21. Programming Device
Personal computer or a Laptop
And Communication Cable
Output Module
receives the convert control signals from the CPU and
them converts them into digital or analog values that can
be used to control various output devices.
Central Processor Unit (CPU)
microprocessor system that contains the system memory
and its decision making unit very similar to that of a
computer’s CPU.
Input Modules
Senses the input signal, isolates it and converts it to DC
level.
26. The first and still most popular
programming language used
with PLC is Ladder Logic
Programming (LAD).
27. They are called "ladder" diagrams
because they resemble a ladder,
with two vertical rails (supply
power) and as many "rungs"
(horizontal lines).
The first and still most popular
programming language used
with PLC is Ladder Logic
Programming (LAD).
28. Basic Ladder Logic Symbols
Normally Open (NO) contact
Passes power (on) when coil driving the contact is on.
Contacts
29. Normally Closed (NC) contact
Passes power (on) when coil driving the contact is off.
Basic Ladder Logic Symbols
Normally Open (NO) contact
Passes power (on) when coil driving the contact is on.
Contacts
30. Output or Coil
When power flows through the Coils via contacts they are
energized.
Basic Ladder Logic Symbols