PLC Ladder Logic Basics For Beginners With A Working Conveyor

Ladder logic is a programming language used in industrial automation systems, such as those found in manufacturing plants. It is a graphical representation of a program, with symbols and lines representing logical statements and actions. Allen-Bradley is a brand of programmable logic controllers (PLCs) that uses ladder logic to control industrial processes.
For beginners learning ladder logic, a good starting point is understanding how it is used to control a conveyor system. A conveyor system consists of a series of rollers or belts that move materials from one location to another. It is commonly used in manufacturing and material handling applications.
To control a conveyor system using ladder logic, we need to first understand the inputs and outputs of the system. Inputs are signals that are received by the PLC, such as button presses or sensor readings. Outputs are signals that are sent by the PLC, such as turning on a motor or activating a solenoid valve.
Next, we need to determine the logic of the system. For example, if we want the conveyor to start when a button is pressed and stop when a sensor detects an object, we would create a ladder logic program that reads the button press input and the sensor input. If the button is pressed and the sensor is not detecting an object, the program will send an output signal to start the conveyor. If the sensor detects an object, the program will send an output signal to stop the conveyor.
To create the ladder logic program, we use symbols and lines to represent the inputs, outputs, and logic of the system. A common symbol for an input is a square, and a common symbol for an output is a circle. Lines are used to connect the symbols and represent the logic of the program.
Here is an example of a simple ladder logic program for a conveyor system:
[Input] [Output]
[Button]--[Conveyor]
[Sensor]--[Stop]
In this program, the input symbol on the left represents the button press, and the output symbol on the right represents the conveyor motor. The line connecting the two represents the logic that if the button is pressed, the conveyor will start. The input symbol below the button represents the sensor, and the output symbol below the conveyor represents the stop signal. The line connecting the two represents the logic that if the sensor detects an object, the conveyor will stop.
Ladder logic can become more complex as the system becomes more sophisticated, but this basic example illustrates the concept of using inputs, outputs, and logic to control a conveyor system using Allen-Bradley PLCs and ladder logic. With practice and a thorough understanding of the principles of ladder logic, beginners can confidently control and automate industrial processes using this powerful programming language.
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[@spidergt80]

Another great video , Thanks. Can you make some videos with scaling 4-20 mA devices explaining the linear equation..using math instructions and/scales

[@wildfilms2718]

Great video! Would love to see more basics like this. 👍🏻

[@ShaneWelcher]

Glad to help, use the search tab on this channel & type in keywords that you would like to see.
There are over 300 videos

[@lanthonyperdum6430]

Great information…Thanks for the basics once again !!!

[@ShaneWelcher]

Glad to help

[@Abdiedits_]

Love the videos. Keep it going please and thank you 🙏

[@ShaneWelcher]

Thank you

[@Maverickautomations]

Great 👍

[@ShaneWelcher]

Thanks

[@BigMrToe]

Was checking out that Allen Bradley training website. Is the 19 dollars a month for the logic 5000 simulator? What am I getting? I would like to sign up. I some questions.

[@ShaneWelcher]

Visit my training site and watch some of the preview videos to make sure its a good fit for you

[@kevin-cr9gt]

What software is this? Or do you know of any free plc software programs available to learn on?

[@ShaneWelcher]

EasyPLC machine simulator, email me at [e-mail]

[@Mak_Patel03]

Hi Sir, I was wondering what kind of software you have used for this program?

[@ShaneWelcher]

EasyPLC Machine Simulator
Visit www.nirtec.com/purchase-price
When you check out use code
Shane_EasyPLC
For a discount.
I use that software with Rockwell Automation's Studio 5000.
Studio 5000 does not come with EasyPLC

[@Mak_Patel03]

​@@ShaneWelcher Yes, sure. Thank you!

[@Mak_Patel03]

Is PE1 start pushbutton and PE2 stop pushbutton?

[@ShaneWelcher]

@@Mak_Patel03 in the example I wrote, if no PE is active then the conveyor automatically starts to get the system active because no pushbuttons or HMI controls

[@sjo627]

Rung 0 is to start the process when the conveyor is not moving in either direction and both PE1/PE2 are in a low state - is this correct?

[@ShaneWelcher]

Yes

[@Countercommie]

Thank you for asking this question. I was struggling to understand the purpose of the TOF timer. Reading the comments and seeing your question brought me to the answer.

[@magerius]

Are you using Factory I/O ?

[@ShaneWelcher]

No, EasyPLC Machine Simulator

[@JaykeSapalaran-iq3qs]

Great video information 👍❤ thank you for sharing your knowledge and experience 🇵🇭🫡🫡🫡🫡

[@ShaneWelcher]

Glad to help

[@sboyer087]

Have you ever conducted a line balance on actual machinery?

[@ShaneWelcher]

Line balance?

[@sboyer087]

the sum of all task times divided by the number of workstations.

[@sboyer087]

@@ShaneWelcher Line balance efficiency
The line balance efficiency is a measure of how well the production line is meeting its takt time goal. It is calculated by dividing the total process time by the cycle time, and then multiplying by the number of operations, and then multiplying by 100%

[@chazchampion4281]

Wheres the E stop ?

[@ShaneWelcher]

It's just a simple example, there is no push button station.
Did you watch the video and listen to what I said?

[@Honey_bee098]

It goes on forever

[@ShaneWelcher]

@@Honey_bee098 Again, it's an example of no push buttons.
It's meant to show how EasyPLC machine simulator works

[@Honey_bee098]

@@ShaneWelcher I know I was kidding, I was actually watching this video to get a refresher on basic ladder logic to prepare for my exam. Thanks

[@liaqatali-ht3it]

Thanks

[@ShaneWelcher]

Welcome