PLC Programming Tutorial for Beginners_ Part 1

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PLC Programming Tutorial for Beginners_ Part-2

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In this lesson we will learn how to write a PLC program using an "S7 300” PLC and “STEP 7” software.

We have two pumps which are being used to transfer two separate liquids into this tank.Inside the tank there are two level switches installed in the lower and upper parts of the tank respectively.

There is also an electrically powered mixer inside the tank which starts working for a defined period of time, mixing the two liquids together after the tank has filled.

We also have a discharge valve in the bottom of the tank which controls the draining of the liquid from the tank.

When the level of the liquid drops to the level of the switch's position the contact closes, sending a 24 volt DC signal to the PLC input.

We want to write the program so that when the level of the liquid reaches this minimum, the pumps will be activated and begin filling the tank with the liquids.

The pumps continue filling the tank until the level reaches its maximum at the higher level switch. When this happens the open contacts in the switch will be closed and another 24-volt signal will be sent to the PLC input telling us that the tank is full.

When this signal has been sent, first the pumps should shut down so that no more liquid enters the tank, and then this mixer should be turned on.

We want the mixer to operate for seven seconds, mixing the liquids that have been pumped into the tank.

After seven seconds the mixer should automatically shut down and this discharge valve should open.

With the valve open the liquid will be discharged from the tank and transferred to another location within the factory to be processed.
When the level of the liquid in the tank drops to the minimum set level of the lower switch, the switch contacts will close again thus starting a repeat of the cycle!

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I am working as maintenance engineer for 4 years. I am learning PLC programming by following your tutorials. Thank you brother.

TT_S

I remember getting a taste of this stuff when the processing room I used to work in was getting retooled and programmers were working to get all valves, mixers, sensors etc. operating correctly. I as a lowly operator got to see that. Never knew how much went into programming something simple as turning a mixer on or off.

ronnieperez

Rodrigo, We're glad you found the video helpful. Tenha Um Bom Dia!

realpars

This is absolutely the best video on Youtube about PLC programming

nischalgautam

Very very helpful video thank you sir
I’m newly joined in a Switchgear firm as design support!!!
Really needed video

sibinams

thanks bruh, i rarely subscribe to any channel that i usually watch... but yours really help me, a fresh graduate to learn instrumentation... god bless you

muhammadhilmanhakim

Thank you realpars.
I got( passed interview) my new job only by following your vedios and last preparation of two night hard study about PLC, VFD.
I AM GRATEFUL TO REALPARS.
N.B : My present salary is 3 times of my previous job salary ...
Love you realpars

pavel

This is a great video. It cleared so far so many things. Now I am going to watch part 2 for further details on programming.

JahanZeb

I am working as mentanence engineer since 15 year....
Thanks...

pnjoshi

For the beginners, this video is very valuable to learn, thanks a lot.

mirzazulfuqar

Just finished my electrician apprenticeship in Australia.
I'm going to get into PLC

russelsprout

My very first instruction on PLC, everything explained was well understood.

briangagen

Very good. I have no programming experience and was able to grasp the concept easily. We use PLC's extensively and I wanted to get a grasp on how they're programmed. It's always been interesting to me how these are set up.

kevinneal