Inst ToolsInst ToolsInst Tools
  • Courses
  • Automation
    • PLC
    • Control System
    • Safety System
    • Communication
    • Fire & Gas System
  • Instrumentation
    • Design
    • Pressure
    • Temperature
    • Flow
    • Level
    • Vibration
    • Analyzer
    • Control Valve
    • Switch
    • Calibration
    • Erection & Commissioning
  • Interview
    • Instrumentation
    • Electrical
    • Electronics
    • Practical
  • Q&A
    • Instrumentation
    • Control System
    • Electrical
    • Electronics
    • Analog Electronics
    • Digital Electronics
    • Power Electronics
    • Microprocessor
  • Request
Search
  • Books
  • Software
  • Projects
  • Process
  • Tools
  • Basics
  • Formula
  • Power Plant
  • Root Cause Analysis
  • Electrical Basics
  • Animation
  • Standards
  • 4-20 mA Course
  • Siemens PLC Course
Reading: PLC Program Examples
Share
Notification Show More
Font ResizerAa
Inst ToolsInst Tools
Font ResizerAa
  • Courses
  • Design
  • PLC
  • Interview
  • Control System
Search
  • Courses
  • Automation
    • PLC
    • Control System
    • Safety System
    • Communication
    • Fire & Gas System
  • Instrumentation
    • Design
    • Pressure
    • Temperature
    • Flow
    • Level
    • Vibration
    • Analyzer
    • Control Valve
    • Switch
    • Calibration
    • Erection & Commissioning
  • Interview
    • Instrumentation
    • Electrical
    • Electronics
    • Practical
  • Q&A
    • Instrumentation
    • Control System
    • Electrical
    • Electronics
    • Analog Electronics
    • Digital Electronics
    • Power Electronics
    • Microprocessor
  • Request
Follow US
All rights reserved. Reproduction in whole or in part without written permission is prohibited.
Inst Tools > Blog > PLC Tutorials > PLC Program Examples

PLC Program Examples

Discuss different PLC program examples for Signal lamp task, Valve operation program and make an output switch off when any of the sensors activated.

Last updated: November 2, 2023 2:28 pm
Editorial Staff
PLC Tutorials
2 Comments
Share
3 Min Read
SHARE

Discuss different PLC program examples for Signal lamp task, Valve operation program and make an output switch off when any of the sensors activated.

Contents
PLC Program Example 1PLC Program Example 2PLC Program Example 3

PLC Program Example 1

A signal lamp is required to be switched on if a pump is running and the pressure is satisfactory, or if the lamp test switch is closed.

For the inputs from the pump and the pressure sensors we have an AND logic situation since both are required if there is to be an output from the lamp. We, however, have an OR logic situation with the test switch in that it is required to give an output of lamp on regardless of whether there is a signal from the AND system.

Also Read: PLC Latching Function Logic

The function block diagram and the ladder diagram are thus of the form shown in Figure 1.37. Note that with the ladder diagram we tell the PLC when it has reached the end of the program by the use of the END or RET instruction,

PLC Program Example for Signal Lamp Task

PLC Program Example 2

As another example, consider a valve which is to be operated to lift a load when a pump is running and either the lift switch is operated or a switch operated indicating that the load has not already been lifted and is at the bottom of its lilt channel.

We have an OR situation for the two switches and an AND situation involving the two switches and the pump. Figure 1.38 shows a possible program.

PLC Program Example for Valves Output

PLC Program Example 3

As another example, consider a system where there has to be no output when any one of four sensors gives an output, otherwise there is to be an output.

One way we could write a program for this is for each sensor to have contacts that are normally closed so there is an output.

When there is an input to the sensor the contacts open and the output stops. We have an AND logic situation. Figure 1.39 shows the functional block diagram and the ladder diagram of a system that might be used.

Also Read: Introduction to PLC Programming

If you liked this article, then please subscribe to our YouTube Channel for PLC and SCADA video tutorials.

You can also follow us on Facebook and Twitter to receive daily updates.

Read Next:

  • What is Emergency Shutdown System (ESD) ?
  • ESDV : How it Works ?
  • Programmable Logic Controller (PLC) Questions
  • Explain Operation of the Lamp Circuit ?
  • Binary Addition
Don't Miss Our Updates
Be the first to get exclusive content straight to your email.
We promise not to spam you. You can unsubscribe at any time.
Invalid email address
You've successfully subscribed !

Continue Reading

Timers in Codesys – Timer ON, Timer OFF, Pulse Timer
How to Delete the Siemens CPU Memory?
VFD Commissioning and Testing Procedure (Variable Frequency Drive)
Sink or Source? Normally Open or Normally Closed?
Concept of Interlocking in PLC
Download a Ladder logic program to GE PLC
Share This Article
Facebook Whatsapp Whatsapp LinkedIn Copy Link
Share
2 Comments
  • Engr. Shshadat Hossain says:
    February 17, 2016 at 5:59 pm

    Very helpful example.

    Reply
  • Tayo Arogundade says:
    March 30, 2017 at 9:56 am

    Great,this resolved my interview fever/stress…Thank you guys..

    Reply

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

Stay Connected

128.3kFollowersLike
69.1kFollowersFollow
210kSubscribersSubscribe
38kFollowersFollow

Categories

Explore More

Tia Portal – OB30 Cyclic Interrupt Organization Block
#11 PLC Best Practices – Instrument for Plausibility Checks
Rockwell PLCs for Large Scale Applications
FactoryTalk View Studio – Import and Export Tutorial
Software Redundancy in Siemens PLC – Hardware versus Software
Use of Regions in SCL Language
PLC Wiring Questions for Technicians and Engineers
PLC Permissive for Motor Control

Keep Learning

Grounding Electronic Equipment

Importance of Grounding Electronic Equipment

PLC Instructions

Program Flow Control Instructions in PLC Programming

PC-Based Motion Controller

Various Types of Delta PLC used in Industrial Automation

Select Security type Intouch

How to Add Security in InTouch SCADA?

PLC Timer Programming Examples – TON, TOF, TP and TONR

Masked Move Instructions

How to use Masked Move Instruction in PLC

Programmable Logic Controller (PLC) Questions and Answers

PLC Ladder Logic Questions and Answers

Parts of PLC

Parts of PLC

Learn More

Why is HV Testing important in Electrical Panels?

Why is HV Testing important in Electrical Panels?

Water Treatment Plant

Difference Between ETP, STP, and WTP – Treatment Plants for Water

4-20mA Transmitters Easy Calculations

4-20mA Transmitters Calculations

Brands PLC communication interface and protocol

Communicating Between Siemens PLC and Other PLC Brands

Advances in Control System

Fuzzy Logic Control

Facts of Control Valves

Facts About Control Valves

DP transmitter Errors

DP Transmitter Calibration Errors

Electrical Networks Objective Questions

Electrical Networks Objective Questions

Menu

  • About
  • Privacy Policy
  • Copyright

Quick Links

  • Learn PLC
  • Helping Hand
  • Part Time Job

YouTube Subscribe

Follow US
All rights reserved. Reproduction in whole or in part without written permission is prohibited.
Welcome Back!

Sign in to your account

Username or Email Address
Password

Lost your password?