Name- Basant raj Kheriwal. Branch- Electrical Engineering. Semester- 6th College- Sobhasaria Group of Institution.

1. Programmable Logic Controllers
(PLCs)
By- Basant Raj Kheriwal.
Roll No- 18ESOEE004
Branch- Electrical Engineering.
Semster- 6th
SOBHASARIa GROUP OF INSTITUTIONS, SIKAR

2. I. Introduction To PLCs.
II. History of PLCs.
III. PLCs Brands.
IV. Components.
V. Major Components.
VI. Basic Working.
VII. Hardware Of PLCs.
VIII.PLCs Programming.
IX. Ladder Programming.
X. Basic Parts Of Ladder Diagram.
XI. Advantage Of Using PLCs.
XII. Applications Of Plc.

3. ❖ PLCs understand for Programmable Logic Controllers.
❖ PLC is an Industrial Computer that monitor inputs,
makes decision based on its program and
control outputs to automate a process or Machine.
❖ Basically PLC is used for Electro-
mechanical Processes.

4.  The First PLC was invented in 1968 By Dick Morely.
Dick Morely is considered as the father of PLC. The
first PLC name was Modicon-084, for General
Motors.
 In 70’s The communication Abilities Appears.
 In 80’s standardization becomes on Communication
Protocols.
 In 90’s standardizations Becomes on Programming
Languages.

5.  Siemens.
 Rockwell Automation.
Allen-Bradley by Rockwell Automation
 Mitsubishi electric.
 Schneider electric.
 Toshiba.
 General electric .
 Delta.
 Honeywell.

6. ❖ Controller.
❖ Input System.
❖ Output System.
❖ Programming.
❖ Communication
Device.
❖ Power supply.

7. ▪ Input Modules accepts and convert signals from
sensor into a logic.
▪ Output modules convert controlled instructions into a
signal that can be used by actuators.
▪ CPU(Central Processing Unit) Is a brain of PLC that
governs the entire activities of PLC system.
▪ CPU generally consists of Memory, Timers &
Counters.
▪ Power supply work is to provide voltage needed to run
PLC components.
▪ Programming Device terminal is used to put the
program require to work PLC.

8.  PLC can be described as small industrial computer with
modular components Designed to automate control
process.
 The PLC takes input, perform logic on the input in the CPU
and the on/off as required.
 PLC monitor the input and it take information from input
and then operate output.

9.  So ladder programming language is used to run the
plc.
 There are certain software available to program a
PLC such as Logic Pro
 There are many symbol used in ladder programming
such as:
 Normally Open, Normally Closed, Binary, Holding,
Interlocking, etc.

10. Microprocessors like the ones found in PLCs and
personal computers operate on the binary concept.
It refers to the principle that things can be thought of
in one of two states.
The states can be defined as:
➢ 1 or 0
➢ On or off
➢ High or low
➢ Yes or No

11.  Rail
 Rung
 Input
 Output
 Logic expression
 Tag name
 comments

12. Cost effective
High Speed
Better memory
Less power consumption
Ease of programming in the plant
High reliability and minimal maintenance.
Small physical size.
Moderate to low initial investment cost.
Available in modular designs.

13.  The PLC is also commonly used in civil applications
such as in washing machines and for controlling
traffic signals and elevators.
 They are used in many industries to monitor and
control production processes and building systems
such as:
 In a Traffic light signal system.
 In automatic transfer switch
 In industrial manufacturing.
 In medical instruments and technologies.
 In machining assembly etc.

15. Thank You