Really good tutor you are! I am exactly the one like your video title “beginner” and found perfect tutor for this course. Please keep upload latest and complex problems.
Appreciate it Khosiabtshaj :-) Of course there are many methods to approach these concepts but I found this translation method the most straight forward.
Design a PLC program and prepare a typical I/O connection diagram and ladder logic program that will correctly execute a timber pressing system. The process presses three timber plates to for one thicker timber. The sequence of operation is as follows: Thinner timber plates are placed on the conveyor manually as long as space is available to place on the conveyor. The conveyor moves the timber plates to a point A where a robot is used to pick 3 timber plates sequentially and place on the pressing plate. In between the timber a machine sprays glue on each. The pressing machine presses it for 6minutes then the robot puts the pressed timber back on the same conveyor and continues this way. The robot is operated by three motors, two for motion one for grabbing. One motor to move the base arm up and down, one motor to rotate the base arm right and left and the third to grab or release the object. The vertical and rotational motions are restricted by two limit switches for each. The is a limit switch on the grabber which switches on when it presses on the surface to pick drop the timber. The timber pressed should also be counted to know the production size. The process is started by a start button and stopped by a stop button. There will be stoppage of the conveyor for the process to operate properly. A position sensor is also installed at the base of the robot to detect the arrival of a timber.
Hi Ali, I am also confused why you used normally open for STOP even though you mentioned that "If at any time the STOP (normally closed momentary) button is depressed, both motors will stop."
Hey Bert, We need to agree on the terminology. Inside the software, we use instructions and these instructions has names. Based on this, the instruction used with Stop is not called normally open. It’s is called Examine If Close [XiC]. We used XiC referring to STOP as STOP is Normally Closed and we want this instruction to be TRUE as long as STOP is not pressed and will allow us to start the motors. Anytime the STOP is pressed; as a switch, it will change to the Open state and the XiC referring to it will change to False and this will break the rung and stop both motors.
For anyone asking isnt that stop button supposed to be nc yes it should be... however this typr of program confuses begginer because the condition ia that when its is pressed it test if it isnt and its a negative of a negative in other words a is suposed to be b and b suposed to be a
great video, but a stopp button has always a NC(normally closed) sign. while yours is NO(normally open) The m2 kontakt that turns off the "m1" is normally closed, that sign should used in the stopp button
Thanks typical. please note that the instruction associated with the Stop within the program is neither NO or NC. Stop itself is a NC switch. However, within the program and for order for it to function as a stop or de-energizing function, we are associating it with an Examine-if-Close instruction. In other words, when we are building our program we talk INSTRUCTIONs. Which instruction to use depends on the input device that we are dealing with.
Great video but i have a question i cant seem to find an answer to. Maybe i'm thinking of it like a physical circuit too much, but @6:52 how does a NO(XiC) stop the motors when pressed? This looks like something that has broken the circuit and needs to be held down to continue.
Thanks Ross, When U want to choose the correct instruction [XiC or XiO] to be used with a STOP or DE-ENERGIZE input, U need to remember that this instruction has to be ALWaYS True as long as this input is in it’s Default state. Based on this and knowing that Stop is Normally Closed button, we need to choose XiC with it as this will maintain this instruction in the TRUE state as long as Stop is not pressed. When Stop is pressed, it will change to Open state and this will change the XiC instruction to False - hence breaking the rung and de-energizing the outputs.
Thanks for sharing these lessons, very helpful am learning a lot....but I think am a bit lost Ali...please explain how the M1 will start when only start-1 is pressed and the stop is XiC (N.O)?
Hello Brian, We are using an XiC with STOP to keep this instruction True as long as Stop is not pressed. This is important because it clears the way to start M1 when Start is pressed. We are going with XiC with STOP because it is NC and this will maintain this XiC in the TRUE state - not breaking the rung - as long as STOP is not pressed.
I am still puzzled, whely the latching is normally open? Shouldnt it be normally closed..,?, How is it that normally open latching able to keep motor 1 running??
You need to check earlier videos and we need to agree that the latching in not Normally open or Normally close. It is an Examine if Close [XIC] instruction that is referring to the output memory address. This is extremely important in understanding the logic used in building the program.
Godric, I suggest you go check earlier videos about Ladder Instructions. you shouldn't look @ latching as normally open or even normally closed. IT is a computer instruction called Examine If Closed - XIC. Please go thru it and we can fill the gaps later on.
initially the STOP was mentioned as NC...then how it is a NO at the end...i get the same result only when i use a NC contact fr STOP button in my program...please clarify
Hari and Click&Cook Recipes; please note that the instruction associated with the Stop within the program is neither NO or NC. Stop itself is a NC switch. However, within the program and for order for it to function as a stop or de-energizing function, we are associating it with an Examine-if-Close instruction. In other words, when we are building our program we talk INSTRUCTIONs. Which instruction to use depends on the input device that we are dealing with.
develop a ladder logic diagram for a car door/seat belt safety system.when the car door is open or seat belt is not done up,the ignition power must not be applied.if all is safe then key can start the car?please make a video on this please
Thanks for the amazing vide, had one small doubt, shouldn't 'STOP' be XIO, as in general conditions it should be conducting and when we want to stop giving M1 and M2 an output we can energise 'STOP' and open the respective switch?
Hello RITHVIK. If we associate the STOP with an XIO, you tell me what would the state of this instruction always going to be as long as STOP is not pressed
@@ALiEALiPLCProgrammingTutorials The stop which is normally a n/c push button will be a nc which will allow current to flow when it is not pressed as otherwise when you press the start how will current flow?
Daniel, U are discussion the Stop from an “Electrical” point of view. We shouldn’t ignore this of course when it comes to programming. As a matter of fact, the same analogy applies but from a logical programming perspective. We need the rung and specifically the stop or the off section to be always true to allow the energizing of an output. From this perspective, the NC Stop switch need to be tied to an XIC instruction which will be always True as long as Stop is not pressed because the XIC always return True as long as it’s tied to a Closed switch. When Stop is pressed, XIC changes to False, it breaks the logic continuity in the rung and de-energizes the output.
Shashank, please rethink the solution using the following summary of concepts: 1- if U have 2 or more conditions with an AND relationship to ENERGIZE an output, these conditions will have to be in Series with each other. 2- if U have 2 or more conditions with an OR relationship to ENERGIZE an output, these conditions will have to be in Parallel with each other. 3- if U have 2 or more conditions with an OR relationship to DE-ENERGIZE an output, these conditions will have to be in Series with each other. 4- if U have 2 or more conditions with an AND relationship to DE-ENERGIZE an output, these conditions will have to be in Parallel with each other. Please do NOT try and memorize the 4 rules above. They are meant only to help us choose correct arrangement among instructions we are using [ series or parallel ]
@@ALiEALiPLCProgrammingTutorials Concept you laid out is true, but I think you said "OR" for first rung and put in series, so shouldn't you be saying "AND for both first and second rung if you are using series? I am confused a little too
@@ALiEALiPLCProgrammingTutorials Thanks, Hey Ali, am graduating this year and I hope you reply to this comment. Would it be wise to get a Water and Wastewater technician certificate along with my instrumentation diploma? or computer eng tech with instrumentation diploma? Just wondering considering i know getting an electrician journeymen ticket is a great combo with an instrumentation diploma, but i am just wondering Water and Wastewater or computer eng tech would be worth doing too, thanks.
Nice example, but your explanations of the logic are inconsistent. Perspective is normally provided from an energized or circuit ON/Active point of view. A normally closed switch is closed (or TRUE) when logic is '0', and opens (disconnects circuit, FALSE) when logic is "1". Thus, the series connection that you show with STOP and M2 to disconnect M1 is a logical AND, both conditions have to be met, i.e.,TRUE) for STOP and M2 to provide path for M1 to conduct (be energized), while a parallel connection is a logical OR as either connection will allow the circuit to conduct through the associated path. In general, series means AND and parallel means OR.
G.A.B, we can’t group all discussions in a single tutorial regardless how lengthy we make 😉 I agree to most of what you said but the last statement needs additional illustrations. “And” is series when energizing and “or” is parallel when energizing. However, when de-energizing the discussion is inverted and for this I have created a new video LD24 - Instructions arrangements.
on 13:00 time your referring to stop as normally closed but its normally open contact I am so confused ? isnt that all e-stop are normally close contact ? please clarify
A stop doesn't have to be an XIO it's might also be an XIC. Don't think of is electrical diagram where current goes from left to right. Think of it as logics. regards
Kabiru, PLCs programming is fun but it needs intensive training and some equipment and software. I recommend enrolling in some industrial or electrical program in a technical institution and this way you’ll have access to devices required.
I think cili is right. If we say it's a NC contact so why dd we use a NO and then set it always on 1. Why not just use a NC & wen the stop button is pressed, it opens thed circuit and M1 & M2 turns off, just as how the question says.
I've been rifling through your videos right now after work. My boss thinks I'm a genius because I'm figuring stuff out so fast lol. Thank you so much.
LoooooL
U know e j, going through non-entertaining videos after work is an act of super hard worker and a genius attitude to me 👌
NPC
Great tutorial, I learned so much from this simple example! Fantastic teacher!
Thanks Ivan. I appreciate your kind words.
Loved it. I am taking evening classes for automation and was looking for videos for research. This is very clear and to the point video.
Glad it was helpful! :-)
You're a naturally born teacher. Getting people to learn from the roots.
Thanks David.
I like to cover as much roots as possible 😉
thanks to this video I managed to pass exam from PLCs. Tnx a lot dude
Glad to hear that Netko :-)
Excellent explanation! One of the best among all PLC ladder logic videos on youtube! Thank you so much for helping out people like me.
Thank U Sankeit 🙂
Really good tutor you are! I am exactly the one like your video title “beginner” and found perfect tutor for this course. Please keep upload latest and complex problems.
I will Patel and thank U for your feedback 🙏🏻
Thans for this
understandable lesson.Greetings from Turkey
Greetings to U Sercan 👌
Thank you for your time and help!🥰
U R Welcome Shikha 🙂
Very good translating from English to Binary.
Appreciate it Khosiabtshaj :-)
Of course there are many methods to approach these concepts but I found this translation method the most straight forward.
you are very beatuful teacher. thank you Ali
🤗
Design a PLC program and prepare a typical I/O connection diagram and ladder logic program
that will correctly execute a timber pressing system. The process presses three timber plates to
for one thicker timber.
The sequence of operation is as follows:
Thinner timber plates are placed on the conveyor manually as long as space is available to place
on the conveyor. The conveyor moves the timber plates to a point A where a robot is used to pick
3 timber plates sequentially and place on the pressing plate. In between the timber a machine
sprays glue on each. The pressing machine presses it for 6minutes then the robot puts the pressed
timber back on the same conveyor and continues this way.
The robot is operated by three motors, two for motion one for grabbing. One motor to move the
base arm up and down, one motor to rotate the base arm right and left and the third to grab or
release the object. The vertical and rotational motions are restricted by two limit switches for
each. The is a limit switch on the grabber which switches on when it presses on the surface to
pick drop the timber. The timber pressed should also be counted to know the production size. The
process is started by a start button and stopped by a stop button.
There will be stoppage of the conveyor for the process to operate properly. A position sensor is
also installed at the base of the robot to detect the arrival of a timber.
Added to my to do list Ghashawbeza
Hi Ali, I am also confused why you used normally open for STOP even though you mentioned that "If at any time the STOP (normally closed momentary) button is depressed, both motors will stop."
Hey Bert,
We need to agree on the terminology.
Inside the software, we use instructions and these instructions has names.
Based on this, the instruction used with Stop is not called normally open. It’s is called Examine If Close [XiC]. We used XiC referring to STOP as STOP is Normally Closed and we want this instruction to be TRUE as long as STOP is not pressed and will allow us to start the motors. Anytime the STOP is pressed; as a switch, it will change to the Open state and the XiC referring to it will change to False and this will break the rung and stop both motors.
Make videos on profibus communication with Siemens PLC.
I promise to add your request to my list Gobeshona. Thank you for the suggestion
Good lectures
Thank U Onyeneke
I really love your explanations, thanks
Thank U Shuaib
Such a explanation.. Big thanks
appreciate it
Thank you so much sir
Very welcome ONUEZIWE
For anyone asking isnt that stop button supposed to be nc yes it should be... however this typr of program confuses begginer because the condition ia that when its is pressed it test if it isnt and its a negative of a negative in other words a is suposed to be b and b suposed to be a
Mashallah HAQ ALI🌹🦁
Please can you make more exercises like this one .
Clearly explanation. Respect
Thank you Hadis :-)
good job
Thank U Sir :)
Thank you that was very helpful! please solve more examples
Thank U Sarah, I’ll do my best
If I want to send bottle in conveyor 1 next bottle have to send to another conveyor 2 and again same sequence how can I program in omron plc sir
great video, but a stopp button has always a NC(normally closed) sign. while yours is NO(normally open)
The m2 kontakt that turns off the "m1" is normally closed, that sign should used in the stopp button
Thanks typical.
please note that the instruction associated with the Stop within the program is neither NO or NC. Stop itself is a NC switch. However, within the program and for order for it to function as a stop or de-energizing function, we are associating it with an Examine-if-Close instruction. In other words, when we are building our program we talk INSTRUCTIONs. Which instruction to use depends on the input device that we are dealing with.
Great video but i have a question i cant seem to find an answer to.
Maybe i'm thinking of it like a physical circuit too much, but @6:52 how does a NO(XiC) stop the motors when pressed?
This looks like something that has broken the circuit and needs to be held down to continue.
Thanks Ross,
When U want to choose the correct instruction [XiC or XiO] to be used with a STOP or DE-ENERGIZE input, U need to remember that this instruction has to be ALWaYS True as long as this input is in it’s Default state. Based on this and knowing that Stop is Normally Closed button, we need to choose XiC with it as this will maintain this instruction in the TRUE state as long as Stop is not pressed. When Stop is pressed, it will change to Open state and this will change the XiC instruction to False - hence breaking the rung and de-energizing the outputs.
Thank you very much
U R most welcome Salah :-)
Please more videos sir
nicely explained
Thank U divya :-)
Thanks for sharing these lessons, very helpful am learning a lot....but I think am a bit lost Ali...please explain how the M1 will start when only start-1 is pressed and the stop is XiC (N.O)?
Hello Brian,
We are using an XiC with STOP to keep this instruction True as long as Stop is not pressed. This is important because it clears the way to start M1 when Start is pressed. We are going with XiC with STOP because it is NC and this will maintain this XiC in the TRUE state - not breaking the rung - as long as STOP is not pressed.
@@ALiEALiPLCProgrammingTutorials Oh the stop xic in N.C...i get it now
Great tutorial
I am still puzzled, whely the latching is normally open?
Shouldnt it be normally closed..,?,
How is it that normally open latching able to keep motor 1 running??
You need to check earlier videos and we need to agree that the latching in not Normally open or Normally close. It is an Examine if Close [XIC] instruction that is referring to the output memory address. This is extremely important in understanding the logic used in building the program.
Godric, I suggest you go check earlier videos about Ladder Instructions. you shouldn't look @ latching as normally open or even normally closed. IT is a computer instruction called Examine If Closed - XIC. Please go thru it and we can fill the gaps later on.
initially the STOP was mentioned as NC...then how it is a NO at the end...i get the same result only when i use a NC contact fr STOP button in my program...please clarify
I have the same doubt
@@HariKrishnan-xp3yc well the doubt has got cleared by myself....if we use NC in plc wiring, in the ladder logic we r supposed to use NO...
@@noohmuhammed633 Thank you
Hari and Click&Cook Recipes; please note that the instruction associated with the Stop within the program is neither NO or NC. Stop itself is a NC switch. However, within the program and for order for it to function as a stop or de-energizing function, we are associating it with an Examine-if-Close instruction. In other words, when we are building our program we talk INSTRUCTIONs. Which instruction to use depends on the input device that we are dealing with.
Can U explain Ladder diagram For to 2 way railway Gate Control at a Time By Automatic Mode
I’d be happy to do so but I’ll need you to provide me with specific requirements and I’ll add this to my bucket list.
I go to Nait, Thank you!
U R in a great place Stefano 👌
Nice Tutorial
Thank you sir :-)
develop a ladder logic diagram for a car door/seat belt safety system.when the car door is open or seat belt is not done up,the ignition power must not be applied.if all is safe then key can start the car?please make a video on this please
Thank U for the suggestion Guru. I promise to add your request to my list of future examples.
hello what is the simulator are you using? how can i download a simulator ?
super lesson
Thanks for the amazing vide, had one small doubt, shouldn't 'STOP' be XIO, as in general conditions it should be conducting and when we want to stop giving M1 and M2 an output we can energise 'STOP' and open the respective switch?
Hello RITHVIK.
If we associate the STOP with an XIO, you tell me what would the state of this instruction always going to be as long as STOP is not pressed
@@ALiEALiPLCProgrammingTutorials The stop which is normally a n/c push button will be a nc which will allow current to flow when it is not pressed as otherwise when you press the start how will current flow?
Daniel, U are discussion the Stop from an “Electrical” point of view. We shouldn’t ignore this of course when it comes to programming. As a matter of fact, the same analogy applies but from a logical programming perspective. We need the rung and specifically the stop or the off section to be always true to allow the energizing of an output. From this perspective, the NC Stop switch need to be tied to an XIC instruction which will be always True as long as Stop is not pressed because the XIC always return True as long as it’s tied to a Closed switch. When Stop is pressed, XIC changes to False, it breaks the logic continuity in the rung and de-energizes the output.
Ur a beast
Hope this is a good thing ;-)
NICE
Thank U
In rung 0, for either or condition you put it in series and then again in rung, you put it in series for "and" condition. M confused.
Shashank, please rethink the solution using the following summary of concepts:
1- if U have 2 or more conditions with an AND relationship to ENERGIZE an output, these conditions will have to be in Series with each other.
2- if U have 2 or more conditions with an OR relationship to ENERGIZE an output, these conditions will have to be in Parallel with each other.
3- if U have 2 or more conditions with an OR relationship to DE-ENERGIZE an output, these conditions will have to be in Series with each other.
4- if U have 2 or more conditions with an AND relationship to DE-ENERGIZE an output, these conditions will have to be in Parallel with each other.
Please do NOT try and memorize the 4 rules above. They are meant only to help us choose correct arrangement among instructions we are using [ series or parallel ]
@@ALiEALiPLCProgrammingTutorials Thank you
@@ALiEALiPLCProgrammingTutorials Concept you laid out is true, but I think you said "OR" for first rung and put in series, so shouldn't you be saying "AND for both first and second rung if you are using series? I am confused a little too
Hey Ali, are you still teaching at Nait?
Not at the moment Mr. Calculus
I love UR nickname 👌
@@ALiEALiPLCProgrammingTutorials Thanks, Hey Ali, am graduating this year and I hope you reply to this comment. Would it be wise to get a Water and Wastewater technician certificate along with my instrumentation diploma? or computer eng tech with instrumentation diploma? Just wondering considering i know getting an electrician journeymen ticket is a great combo with an instrumentation diploma, but i am just wondering Water and Wastewater or computer eng tech would be worth doing too, thanks.
Nice example, but your explanations of the logic are inconsistent. Perspective is normally provided from an energized or circuit ON/Active point of view. A normally closed switch is closed (or TRUE) when logic is '0', and opens (disconnects circuit, FALSE) when logic is "1". Thus, the series connection that you show with STOP and M2 to disconnect M1 is a logical AND, both conditions have to be met, i.e.,TRUE) for STOP and M2 to provide path for M1 to conduct (be energized), while a parallel connection is a logical OR as either connection will allow the circuit to conduct through the associated path. In general, series means AND and parallel means OR.
G.A.B, we can’t group all discussions in a single tutorial regardless how lengthy we make 😉
I agree to most of what you said but the last statement needs additional illustrations. “And” is series when energizing and “or” is parallel when energizing. However, when de-energizing the discussion is inverted and for this I have created a new video LD24 - Instructions arrangements.
on 13:00 time your referring to stop as normally closed but its normally open contact I am so confused ? isnt that all e-stop are normally close contact ? please clarify
Yea all e stops and stops should be normally closed.
Ali, all through the problem the "Stop" button is given as normally closed and the solution is built accordingly.
A stop doesn't have to be an XIO it's might also be an XIC.
Don't think of is electrical diagram where current goes from left to right.
Think of it as logics.
regards
Good sir
Thanks Shankar and welcome
Please I want to learn plc programming
Kabiru,
PLCs programming is fun but it needs intensive training and some equipment and software. I recommend enrolling in some industrial or electrical program in a technical institution and this way you’ll have access to devices required.
is it possible to replace the stop swith with NC set to 0?
Cili, I'm not sure I got your question.
Stop is a NC closed switch that turns to open [0] when pressed to turn off M1 & M2.
I think cili is right. If we say it's a NC contact so why dd we use a NO and then set it always on 1. Why not just use a NC & wen the stop button is pressed, it opens thed circuit and M1 & M2 turns off, just as how the question says.
Where is the M1 interlocking
Shankar, M1 being energized is one of two conditions along with Start2 being pressed required to trigger M2.
I want continuous lecture
I’ll do my best Minyichil
Are plc's this easy
Makombo Madzima , these topics are entry level but in general PLC programming is fun and not complicated :-)
There will be NC of stop in the rung1.! 12:18
Under, can U explain more UR question?
sir this is a wrong ladder diagram
I have questions pleas😭😭
Go ahead Taleb.
🥰👌
🙂
Forward Reverse star star ky banao
??
Where can i join u Ali sir🙂🙏
We are YT buddies 🙂
speak clearly
I’ll do my best Sakthi ;-)
Not productive
Feedback appreciated. I wish you can provide more specific details as this will help me improve my video products. Thanks.
Urdu language use only plees
🤷♂️