PLC Ladder Program: OR and NOT Logic with Real-World Examples | Automation and PLC Series Part 5

Welcome back to our Automation and PLC Series! 🎉

In Part 5, we continue our deep dive into PLC Ladder Programming, focusing on implementing OR and NOT Boolean logic using NO (Normally Open) and NC (Normally Closed) contacts. Building on the concepts from our previous video, we bring these logic gates to life through practical, real-world examples.

🔹 What You'll Learn:
• Understanding OR and NOT Logic in PLCs:
o Learn how to implement OR and NOT Boolean logic using ladder programming.
o Understand the role of NO and NC contacts in creating these logic functions.
• Real-World Application in the Food Processing Industry:
o Scenario 1: How to raise an alarm if any of the two food processing machines fail (OR logic).
o Scenario 2: How to stop the conveyor system when any machine stops, ensuring safety and efficiency.
• Step-by-Step Programming:
o Follow along as we develop the ladder logic diagrams for these scenarios.
o See how ladder programming simplifies complex automation tasks.

🔧 Key Concepts Covered:
• PLC Ladder Programming Basics
• Implementing OR Logic with NO Contacts
• Implementing NOT Logic with NC Contacts
• Developing Control Logic for Automation
• Practical Use of Logic Gates in Industrial Automation

👉 Why Watch This Video?
This video is perfect for beginners and intermediate learners aiming to enhance their understanding of PLC programming and industrial automation. By the end of this tutorial, you'll be able to apply OR and NOT logic in ladder programming to solve real-world automation challenges.

🔔 Stay Tuned:
In upcoming videos, we'll explore more complex logic implementations and delve deeper into the world of PLC programming.

👍 Don't Forget to Like, Share, and Subscribe!
Help us spread knowledge by sharing this video with fellow engineering enthusiasts!
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📢 Join the Conversation:
Have questions or topics you'd like us to cover? Drop a comment below! We're here to support your learning journey in engineering and automation.
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#PLCLadderProgramming #ORLogic #NOTLogic #PLC #ProgrammableLogicController #IndustrialAutomation #AutomationSeries #EngineeringEducation #NOandNCContacts #ControlLogic #PLCProgramming #EngineeringConcepts #2DAnimation #AutomationTutorial #ElectricalEngineering #ControlSystems #EngineeringForBeginners #FunEngineering #EducationalAnimation
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Introduction to PLC | Programmable logic controllers | Steps towards learning Automation - 01

How does a relay work? | Normally Open | Normally Closed | Steps towards learning Automation - 02

Concept of Sinking and Sourcing in PLC | Steps towards learning Automation - 03

PLC Ladder programming #1 | NO NC contacts | AND gate logic | Steps towards learning Automation - 04
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Link to the video on Derived gates:

Link to our video on Boolean algebra

Link to previous videos on Gates:

on Double Beam Spectrometer

on Basics and principle of Fluorescence & Phosphorescence measurement in Analytical Instrumentation

on Basics of UV-Vis spectroscopy in Analytical Instrumentation

on Filters and Monochromators, Gratings used in Analytical Instrumentation

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Check our playlist on Analytical Instrumentation:
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[Kai...]

I won't lie I forgot most of this in PLC class

[jimcheriyan]

Great explanation and animation keep it up. Loved your videos on plc

[MM-fgep]

at 3:23:
Instead of taking output of the alarm as an input of next rung; can't we do a parallel connection on o/p side of both "ALARM & BELT TO STOP" at first rung? so we can reduce one rung.
any suggestions will be appreciated.

[srinidhij]

This is a lot more detailed explanation, thank you

[mnsjewel]

Great video.
But im from no basic.
What if the alarm not worked (or failed) but we need to stop the conveyer?

We need alarm also but our target is to stop the conveyer first. Isn’t it??

Please ans

[HamzanMartinez]

Wouldn't it be better to stop the conveyor first then sound the alarm? (I1 OR I2) AND Stop_conveyor AND (alarm)

[enggresgampang]

Thank you
Is helpfull, simple and clearly

[PhoenixMario]

Awesome Video!!
I subscribed to your channel 👍

[pokecardmaniacs]

Will you be making more plv ladder programming tutorials?

[gunaseelan]

How the NC contact becomes NO without any physical invertntion during alarm pls explain

[ngawanglekchung]

wait so how the NO activate? like what triggers it to activate?

[hariprasad]

Thank you for briefing about plc programming

[gvenagas]

Good evening! Forgive me if I am wrong but I have found some things that hinder my understanding of the terms NO/NC physical contacts and MAKE/BRAKE XIO/XIC internal PLC logical contacts.

First, i tend to believe that a circuit is activated when there is some action (pressing a physical button or contact by the user or when the physical relay coil is energised and therefore magnetizes the contacts.

Second, i tend to consider the user physical switches and the logical internal contacts of the PLC program as contacts of one state, because that way the brain thinks more simply, while they are two states by definition (double throw). So even in the case of non-activation by the user or PLC program there may be an active circuit/load.

With the terms NO/NC I personally like to refer to the user physical buttons or contacts while with the terms XIC/XIO, MAKE/BREAK the logical contacts inside the PLC program that are activated by the user.

To what extent am I correct in my words? Thanks!

[Storyulagam]

Please help to solve this problem
A bottling process for 12 bottles operates as follows: a. Bottles are counted until all 12 are in position for filling (Filling Machine). b. When in position in the carton, the 12 bottles are filled simultaneously for 6.3 seconds. C. After filling, there is a pause of 3.8 seconds for foam to subside. d. The 12 caps are then put on and counted as they are installed (Capping Machine) e. A solenoid (5) then pushes the completed carton of 12 onto a conveyor. f. Conveyor (C) starts running. g. When the completed carton reaches the limit switch (L), that indicates that the carton is out of the "fill" position; the system is then reset for a new group of 12 bottles.

[Coowallsky]

Calling the input instructions “NO Contacts” or “NC Contacts” is a poor approach to teaching Boolean logic in PLC/PAC platforms.

[adamthefallnone]

I might have nevermind... I have a question. How do I delete parts of my ladder? I have an image/ladder of a newer machine on my "older" machine (same type of machine just built in different years), it is trying to read a pressure switch that never existed, I need it to read a float switch in the lube pump, not a pressure switch. I am an operator that got asked to fix something I have very basic knowledge of.. who can help?

[kirankumargadwal]

Please do the complete course of PLC SCADA DCS and HMI

[jujulink]

Can you help draw plc circuit for when PET bottles, pass the sensor on air conveyor the alarm should sound when theres no bottle presence, when bottles are present, it should be quite. Then lastly when no production run, alarm should switch off automatically. This circuit it cant get any signal from any external equipment as modifications are not allowed, the circuitry should remain standard by company protocol.

[gopavaramraghunath]

hiii your videos are great, can u upload more, they are interesting and helpful

[Srk]

confusing part., Is OPEN means circuit is open and no supply ?NC and NO what is mean by it ?