Pneumatic systems engineering sjejej.pdf

(2nd Day)
Basic Programmable Logic
Controller(PLC)Programming and Basic
Pneumatic Systems
Online Course
Eng. Buddhika Weerasekara
M.Sc.(UoM)(Industrial Automation),
B.Sc. Eng.(Ruhuna)(Mechanical & Manufacturing Engineering),
AMIE (SL), A.Eng.(SL)
Lecturer / Course Coordinator (Engineering)
Consultant Engineer (Robotics & Automation)
Conducted by :

Exercise 01
PLC Two Way Switch
Eng. Buddhika Weerasekara www.websayura.com
Copyright©2021-Websayura.plc

Consider a drinks machine that allows the selection of Tea or Coffee and will supply the required hot
drink(hot water) on the insertion of a coin. Write the Logic circuit for this machine operation.
Exercise 02

Presentation Outline
• Internal Structure of the PLC
• Introduction to PLC Controllers
• PLC Programming Introduction
• Practical Exercises

Advantages of PLC System
1. Very fast
2. Easy to change logic (flexibility)
3. Reliable due to absence of moving parts
4. Low power consumption
5. Easy maintenance due to modular assembly
6. Facilities in fault finding and diagnostic
7. Capable of handling of very complicated logic operations
8. Good documentation facilities
9. Easy to couple with the process computers/HMI/SCADA
10. Analog signal handling and close loop control programming
11. Counter, timer and comparator can be programmed

Contactor /Relay based Controlling System PLC based Controlling System

PLC Controller

PLC Inputs/Outputs
Connector
Connection slot

PLC Structure

PLC wiring

PLC Communication Method
DB9 RS-232 Communication cable

Accessing a Bit of Data in the CPU Memory

PLC Programming
Addressing the Process-Image Input Register (I)
Format:
Bit I[byte address].[bit address] I0.1
Byte, Word, Double Word I[size][starting byte address] IB4
Addressing the Process-Image Output Register (Q)
Format:
Bit Q[byte address].[bit address] Q1.1
Byte, Word, Double Word Q[size][starting byte address] QB5

Addressing the Variable (V) Memory Area
Format:
Bit V[byte address].[bit address] V10.2
Byte, Word, Double Word V[size][starting byte address] VW100
Addressing the Bit Memory (M) Area
Format:
Bit M[byte address].[bit address] M26.7
Byte, Word, Double Word M[size][starting byte address] MD20

Addressing the Analog Inputs (AI)
Format: AIW[starting byte address] AIW4
Addressing the Analog Outputs (AQ)
Format: AQW[starting byte address] AQW4

• When Person enters the storage facility building for some work, he will operate lamp 1 by pressing switch 1.
when work will be completed then operator will turn OFF the light.
• So, person cannot operate another segment’s lamp until he stops the first segment lamp. Same case occurs
in other segments.
Example 03

Example 04
Task
Input : S1 –Strat Push Button
S2 – Stop/Emergency Push Button
S3 – Output valve open switch(Toggle Switch)
Outputs : V2 –Liquid valve 01
V4 – Liquid valve 02
V5 – Output valve
M1 – Motor output
When press the S1 push button, V2, V4, and M1 should be ON.
If the S3 switch is ON, V2, V4, and M1 should be OFF and V5 should be OPEN.
If Press S2, all systems will OFF any time.

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