This document describes experiments conducted using a programmable logic controller (PLC) to control various functions. The experiments include: 1) using a PLC to start and stop a motor via push buttons, 2) adding reverse direction control, 3) using timers to add on/off delays, and 4) combining on/off delays. The purpose is to understand and implement ladder logic programming of a PLC. Key components of a PLC like the power supply, processor, input and output modules are discussed. Ladder logic programming allows flexible control of industrial machinery.

1. KXGK6103 prepare : KGK150011 Khairi Ahmed Elrmali
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FACULTY OF ENGINEERING
(INDUSTRIAL ELECTRONIC AND CONTROL)
MODERN INDUSTRIAL ELECTRONICS
(KXGK6103)
Laboratory #1
Basic PLC Ladder Programming
KGK150011
Khairi Ahmed Elrmali

2. KXGK6103 prepare : KGK150011 Khairi Ahmed Elrmali
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Submitted To: Professor Dr. Saad Mekhilef
Semester I
Academic Session 2016/2017
Introduction
Overview
A programmable logic controller, also called a “PLC” or “programmable controller”,
is a computer – type device often used to control equipment in an industrial facility.
The kinds of equipment that PLCs can control are numerous. Conveyor systems, food
processing machinery, and auto assembly lines are all controlled by PLCs
PLC brands: Siemens, Allen-Bradley, IDEC, ABB, Mitsubishi, Omron, Honeywell,
Schneider Electric, Saia-Burgess Controls, and General Electric.
In this experiment we will use Omron (SYSMAC C200HS OMRON)

3. KXGK6103 prepare : KGK150011 Khairi Ahmed Elrmali
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Purpose
The purpose of this lab is to understand and implement the ladder logic to program a
PLC.
Required Materials Hardware
Figure (1): Direct on Line Motor Start Stop using PLC
EQUIPMENT AND SUPPLIES
1. PLC with Input and Output Modules

4. KXGK6103 prepare : KGK150011 Khairi Ahmed Elrmali
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2. 3 Phase AC Motor, Momentary contact switches
3. Electromagnetic contactors relays
4. 230V, 15A rated wires
How They Work
All PLCs have four basic major parts: power supply, processor, input modules, and
output modules.
input devices such as push button switches are wired directly to the input module,
and the motor starter or solenoids are connected directly to the output module
the program in the PLC will determine which switch will control which output
Figure (2): PLC system

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Basic instructions
a control circuitry can be changed unlimited times through simple changes to the
ladder logic program

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Lab Procedure
The programming panel can be a dedicated device or it can be a personal or
portable computer with PLC programming software loaded on it

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PROGRAM: to make or modify or improve the program.
MONITOR: to change the value of the counter and timer settings when the PLC still
operate
RUN: to operate the PLC without being able to change the value of the existing
settings
Procedure to insert the program

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Sequence of operations
Experiment #1: start/stop motor control PLC Program
Address Instruction Operand
0000 LD 000
0001 LD 100
0002 AND 101
0003 OR LD

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0004 AND NOT 001
0005 OUT 100
0006 OUT 101
0007 END FUN(01)
Experiment #2: start/stop reverse direction switch motor
Address Instruction Operand
0000 LD 000
0001 LD 100
0002 AND 101
0003 OR LD
0004 AND NOT 001
0005 OUT 100
0006 OUT 101
0007 LD 002
0008 OUT 102

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0
0009 END FUN(01)
Experiment #3: PLC Timer (ON Delay).
Enabling the indicator to be ON after a 3 sec delay when switch pressed and
OFF immediately by the switch .

11. KXGK6103 prepare : KGK150011 Khairi Ahmed Elrmali
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Experiment #4: PLC Timer (OFF Delay).
Enabling the indicator to be ON immediately when switch pressed and OFF after
a 5 sec delay by the switch.
Address Instruction Operand
0000 LD 000
0001 LD 102
0002 AND NOT 001
0003 OUT 102
0004 LD 102
0005 TIM 000 #0050
0006 LD TIM000
0007 OR 100
0008 AND NOT 101
0009 OUT 100
00010 OUT 101
00011 END FUN(01)

12. KXGK6103 prepare : KGK150011 Khairi Ahmed Elrmali
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Address Instruction Operand
0000 LD 000
0001 LD 100
0002 AND 101
0003 OR LD
0004 AND NOT 001
0005 OUT 100
0006 OUT 101
0007 LD 100
0008 TIM 100 #0100
0009 OUT TIM001
00010 RESET 100
00011 END FUN(01)
Experiment #5: PLC Timer (ON Delay & OFF Delay).
Enabling the indicator to be ON after a 5 sec delay and OFF after a 3 sec delay by the
switch.

13. KXGK6103 prepare : KGK150011 Khairi Ahmed Elrmali
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Address Instruction Operand
0000 LD 000
0001 OR 115
0002 AND NOT 001
0003 OUT 115
0004 LD 115
0005 TIM 000 #0050
0006 LD TIM000
0007 LD 100
0008 AND 101
0009 OR LD
00010 OUT TR0
00011 AND NOT 001
00012 OUT 100
00013 OUT 101
00014 LD TR0
00015 TIM 001 #0050
00016 RESET 115

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00017 LD TIM001
00018 RESET 101
00019 END FUN(01)
Conclusion
Basically a PLC contain four basic parts of hardware: power supply,
processer, input module and output modules. Usually all input devices are wired
directly to the input module. For this experiments, the push button is used as an input
devices and motor starter (output devices) is connected directly to the output module.
Ladder diagram is used to program a PLC so that it can perform the logic functions.
Ladder diagram is created using a programming panel. To start using the panel, make
sure the MODE of the panel in a correct mode. It is either in READ,WRITE or
PROGRAM mode. PLC ladder logic program consist of five basics logic function
such as AND,OR,NOT,NAND and NOR. Another important features in ladder
diagram is the address number of the relay and memory relay. The ladder diagram
also can be program on-line and the programmer can monitor the program based on
real time systems. 3 phase induction motor can be control using PLC. We can
program the PLC to control the motor either the START and STOP, direction of
motor rotation and delayed timing .
For the conclusion, PLC play important role in industrial application since it
can be used widely to control the machinery in industrial world