PLC Troubleshooting 101. Basic Steps to Diagnose and Fix Your Machine

well hey friends today we're going to be talking about troubleshooting PLC control machines and specifically we're going to talk about one why it's so hard to make videos on troubleshooting PLC control machines why you can't find good machines to teach troubleshooting while we shouldn't mainly or why we may not should trust our hmis how we should react when it's a mechanical problem why operators are so invaluable when troubleshooting machines and finally what are the repeatable steps to troubleshoot most problems and notice I said repeatable not the fastest because if we can come up with a repeatable method we can gain speed but we put out a riddle yesterday asking okay how would you troubleshoot machines and the answers were honestly the answer an were not surprising I know every riddle I have highlighted someone who like gave the great answer and there were no wrong answers I made sure I was clear on that but really two people came really close to what I thought was a good answer well actually two of you nailed it right on the head but you've been to my class so you don't count I'm very proud of you for remembering how to troubleshoot machines but yes you that was a little bit of cheating now we have a different view for this because yeah we are going to be talking about this machine trainer in fact if you haven't seen my class I'll zoom out a little bit here's actually our classroom where we teach about troubleshooting and this machine right here is the main machine that we use to troubleshoot and so question one number one that I get from a lot of you is can you zoom into the classroom and my answer is always no and even last week some was like no I'll pay full price I just can't uh my company won't approve my travel and I'm like no it doesn't work that way because gosh you never prate actually wait yeah this one I'm going to drag my screen over a little bit and if you look here at this trainer I can figure out where to point there's no wires on it and the reason there's no wires on it is you have to actually wire these plc's up and you have to find out oh it didn't work in fact I don't think I've ever had anyone wiring work right the first time so literally you've got to open up the manuals you got to be able to figure out the manuals you got to figure out you know how to wire it and then when it doesn't work I'm just like oh well why doesn't it work you know and everybody's like well I don't know and I'm like well why did you put the positive wire there and the answer always is well that's what we always do I'm like okay but why do we do that and so it's really difficult for you to zoom into something and see that and you get your wire hooked up and 15 minutes later because you didn't get on the terminal screw good all sudden it falls out and you're like well it worked a little bit ago now it's not working I'm like oh well why is that you know and you don't realize it but you're gaining a lot of troubleshooting skills in that little bit of time so that's why it's really hard to teach troubleshooting online even this video I'm going to give you some really good fundamentals to follow but if you don't like practice practice practice and practice then really they're not going to sink in at all but also really you know this is why I tell you all the time you know get it you know what use the simulators to figure out whether you're really interested in learning this but get yourself some Hardware as soon as you can because too many of yall are stuck in the software part of it and also when you go to hook up a wire out in the field you get your first you know real job or project you can't do it so you that you need practice on those pieces now this machine right here actually if um you know we and we do we invite schools in fact somebody this uh this morning had put a comment why don't you do a train to trainer we we train Educators all the time we work with Educators and they always ask well why can't we get this machine right here why how much does it cost and I always tell them it's not for sale and people are like well what why don't you sell that machine because it's not about the machine it's about putting you into a situation where you feel like you're right at the job site and so that's what I'm going to try to walk you through today is I'm actually walk you through our expectation exercise that we do do with this now couple things is I read I didn't comment on many of your posts I did push a few of you on and you know hey how you really thinking through this but I didn't comment on many of them but there were some repetitive things that are about the same as you know I hear when people come here is you know I ask well how do you troubleshoo a machine well I go check the HMI and see what it says now here is the pitfall of doing that is most hmis honestly well even my first HMI when I said I added Diagnostics to it it had the io States told you the EOP was pressed some real basic things you know the idea that in five years that linear rail was going to be worn out and was going to drop down it was going to start nicking the sensor and cause an erratic issue just never really occurred to me so while we want we do want hmis we do want good written programs that cannot be our only troubleshooting is to walk up to the HMI and figure out what happens now the other interesting one is you're going to find that I'm getting ready to tell you to do the exact opposite of what everyone out there said to do during this and we'll get to that in a second but first yeah so what do we do if we you know because the other one is a lot of you said well I would study on the drawings and the program for a while and get real familiar with it well the machine is down do you know how much downtime is per minute in fact um I just did that and yeah small business manufacturing downtown and we're talking to companies that are probably just a little larger than you know Amber and me it is $150 to $450 a minute so while yes we want to be as familiar with a machine as possible we can't really tell someone well okay let me come back tomorrow after I've had time to review we've got to have some strategy about how we can go through an unfamiliar machine which kind of brings us to this machine this is the unfamiliar machine and yeah we don't do a lot of videos on this one because if I do videos on it then it becomes the familiar machine because you know before you come to my class most of you have watched a bunch of my videos but I am going to give you a peek inside the program and kind of how we work through it but this machine here on Wednesday you have to fully reverse engineer because all y were we need documents we need drawings we need need a program with descriptions well there are no drawings for this there are no program descriptions and there is no user manual so literally they have to walk up and figure out even how to start this thing and I'm going to give you a little peek into it because it doesn't take that much to figure out how to do it we hit the green button motor turns on little valve opens up little thing turns there and yeah we're just blowing a pingpong ball up we're actually doing P equations all types of stuff so there's a lot of troubleshooting abilities in this machine but how do we troubleshoot it if we just get a call because a lot of us you know we do field work you know and we get a call from a customer they're like hey uh I got a machine down here can you come help me well okay that's probably all the info we get which brings us to the really Golden Rule of troubleshooting is Go Ask the operator what it's doing and it's funny I know when people come to the class because you know by the time you're in my actual classroom you've got some experience you probably bed your head against the wall you've buted your head against operators management everything else and you they I'm like well what's the first thing you know you do should you talk to the operator oh they've always gone to lunch by the time I get there well go get them off break go figure out what the machine is not doing and you really need to become good friends with the operator because really if you're good friends with the operator they'll give you more info if you seem like the guy that's talking down to them all the time they're going to give you a lot less info and this doesn't just go for troubles she this goes for if you're making machine upgrades I've made upgrades on machines and you know I get there and I put them in and The Operators like this is never going to work I'm like well this is what management told us to do and you guys put that in one guy put that in the comment the other week it's like well I get paid no matter what I'm like yeah you you get paid no matter what but you know if you are the one that goes and toss the operator and says hey this is what we're planning on doing and then the operator tells you no that won't work and you go back and say hey found out we need to adjust this this way management is actually going to be much happier with your job and yeah you're going to get paid either way but do you know what happens next time they're like hey call Tim and get him to go talk to such and such and see how to upgrade this we didn't even have to get a quote that time we automatically in so talk to these operators figure out what's going on and the other one that I don't want to address before we get into how to troubleshoot is a lot of you said well it's usually a mechanical problem and Tedy Leroy actually put it best on this one he said in my time of Maintenance I found it to be 75% found 75% of problems to be mechanical including hydraulic and pneumatic 15% to be electrical and 5% to be program related and 5% other and and here's the thing if you walk up and you say it looks like a mechanical problem do you think they're really going to call you back you're going to become that programmer or that technician or whatever you want to call yourself that they're like well if it's a necessary evil call Tim but in no other circumstance should we even call him now if you go out there and you troubleshoot and okay you're right it's going to be mechanical but you know the HMI actually is going to say motor overloading well who they going to call hey Tim I got a motor overlo can you come look at it well yeah the motor is fine we know the bearings are locked up but then you go out there and you find the bearings point the bearings out and be like hey here's the two bad bearings I mean you just saved the mechanical technician so much time they're going to Value you the Management's going to Value you again and the it's going to get the point they call you hey Tom go check out what this is and so it's going to help you build a better relationship all right now we're getting ready to get into how to do repeatable trouble she but yeah let me see what does the chat say because I haven't even brought the chat up is hey Christian very nice to see you good hello from Chile Kevin Burke good to see you glad you're looking forward to it Philip McBride yes operators invaluable absolutely right see beon yeah I agree that operators know the machine and they do now and that's well list as way because we're going to go to that in a second see R Clon HMI is about like a check well and here here's the thing you're right Arc living and it's not the necessarily now in a lot of cases it is the programmer's fault but I think most programmers at the level they're at have no idea how to truly trouble shoot a unfamiliar machine and that's the key because a lot of you did put in well you know I wrote this program and I put all this stuff in but okay how would you go troubleshoot someone else's machine and that's the mindset you really have to put yourself in to write good programs because you know we always say we help you become a better technician our training is for technicians now we do get engineers in here we actually get manufacturers of equipment in here that have to support plc's but they're not good candidates for our class until they realize you know we got to support the technicians I need to learn how to write better programs at that point they are a fit for our class before that they're not really a fit excuse me all right Mark are there any instances where the machine is missing a schematic almost always and that's the funny part you know when I put this post on I'm not knocking yeah I am slightly knocking I can't lie I am slightly knocking because it is experience levels is a lot of you like we always have diagrams you have not been beat up enough in the field there's not a single person that walks into this class when we go on Wednesday what is it step three can't even remember what step it is but one of the steps is figure out what's wired to each input and output and everybody's like huh it's just another day at work CU yeah it happens all the time we don't have R diagrams the diagrams are old somebody did a retrofit they didn't upgrade them somebody redlined some wiring diagrams and they got lost and we had to go pull wiring diagrams that were on file that weren't ever marked up it's common for us not to have that see Levi let's see nearly every machine in our plane is missing prints usually the micr Logics with very few files yep uh people say yeah you know when I but and know I used to try to correct or not correct but encourage people you know if you're out there saying well I get paid anyway n you're just you're not gonna you're not going to ever until you get past that point I just wish you could realize how much one greater your career could be if you could get past that point my mom's here hey Mom let's see Jace I remember software for troubleshooting it was odd to simulate issue but rewarding yeah yeah you're right and you know simulation is very difficult yeah prints are very helpful but okay this is the expectation exercise right here that we do with the technicians zoom in a little bit here so we can get it close on it and I always start this off asking the technicians did your boss send you here to learn how to guess and of course they all shake their head no now out in the field next week I told them I want you to use the best guess possible but this week we want to Think Through the problem and really that's that's all they they don't realize this a whole and I know I'm dating Myself by talking about the Karate Kid still one of the best movies ever but the whole wax on wax off philosophy that's all we're doing here we're really teaching them how to Think Through problems and when all of a sudden on Thursday and we're flipping switches on this which I didn't mention yeah there are 40 switches on the side of this there's actually ultimately about 130 140 combination situation of breakdowns that we can simulate with it but when we start flipping these switches all of a sudden they realize oh man I can troubleshoot I I didn't half of them come in on Monday I've never seen the inside of a PLC program teaching PLC program is easy if somebody is really wanting to learn how to troubleshoot I can walk them through that but again this this is the ex this is the expectation exercise so I always ask you know do you know did you learn here how to press a button does anybody need to learn how to guess and press a button you know do you need to learn you know how to do you know any guess work and they're always like no you know so I said okay I'm going to press the e stop and when we walk at the machine what are we going to do and inevitably about 50% of the time one of the guys like well I always check the e stop when I first get to a machine I'm like your boss did not send you here to learn how to twist an EOP th and so the first thing is what does the operator tell you is happening and so I'm going to hit my buttons and of course it doesn't work now here is the key to troubleshooting that honestly only two people besides my two technicians who've already been here yes I give you Kudos I am proud of you only two of you really nailed down is what is the next step when it's not working and here's what I tell them during this expectation exercise find the action item that it's not doing and start with fit now it's funny how really at this moment during the expectation exercise it always still goes the way that every one of you is thinking out there I ask them well what should we go check and they'll be like well I think we probably need to check the green buttons I'm like do they do action and they're always like well yeah they start the machine I'm like no they do not start the machine the PLC reads the buttons those are inputs if it was an action item the PLC would be magically making those buttons move so what is that action item now there's three action items we've got our intake damper we got our butterfly and we actually there's a fan right here now here's the trick to doing it this way compared to guessing with the buttons even you choose the wrong one it'll lead you to the right one because yeah I and I'm not going to I'm not going to use anybody's post on this because I was really appreciative of how open everybody was about it but one person said and I'm paraphrasing well I would check this button and make sure it's working and then I would have to go check this one and I have to check this one it's pretty much a wild goose chase at that point but usually I can work my way through it and yeah for a lot of us that is how we're doing it and even on a machine this small because I counted it up this morning if you go off of inputs there's 46 possibilities that could be preventing this machine from starting and the issue is if we check the green button and it works then have we learned anything about the other five conditions 45 conditions have we narrowed anything down or did we just figure out one and we're back at square one yeah we're back at square one now if we start at the action item I'm like let's just pick this valve can you see the valve yes so this red this red valve right here needs to open up if we pick that valve then we know for sure that valve is not working if we go and we find that valve we're going to be able to work our way back and figure out why it's not working now here's where there's three sayings that people say I say all the time in this class and yeah think let me go ahead and switch over to my screen Gosh guys I I have my screens all in the wrong places because we're over here now screen there we go and so yeah this is the program right here and immediately everybody wants to go and they want to open up a main routine and I always ask them why are you doing that and they're always like well that's where I always start out at and yeah here here goes to my famous two sayings that everybody says yeah I have to have a shirt for is take your hand off the mouse quit scrolling because if we open up that program the way we just did that's our only option is to scroll and only use our eyes to find the problem now if we want to know what a value is in the PLC and this is a foreign concept still for a lot of you watching this video at this moment that output is a value it is a zero or a one it is not on or off on or off or some other type of terms those are not in plc's we're looking for a one or a zero if we're looking for a one or a zero a 1 two 3 four five or any value a string a word dog cat kangaroo giraffe whatever we want to start in the controller tags you want to start every in fact I have never found a situation and again we're talking about repeatability oh well I always just go to the input because it's always this one I get that you can guess but if we always follow the step we will repeatedly get the result and then if we practice these steps we can gain the speed and so yeah we're going to go to our controller tags ah if I can find my mouse and G get there guys where's my mouse anybody see it on the screen oh man I really got to get my screen there we go we're going to open the controller tags and then you're going to take your hand off the mouse and that's you see already because even here I'm getting worked up about it because the next thing everybody wants to do right away is they want to start scrolling well again you're you're at the mercy of your eyes now to find this tag now here's where it gets difficult on my programmers and my people converting from the software Market because you you guys lecture me all the time because I I make sure sure I sound it out with all of you what the tag is and sure enough somebody always says well you know if you make aliases you could find that a lot easier here's the issue with relying on Ali now I love aliases aliases are great for a lot of things if you don't know what an alias is it's a way that we can name a tag without having to know the funky tag name that actually gets us to the wire now here's a trick and why you can't do that when you're troubleshooting is when they reverse engineer this which the reverse engineering is the same as if we walked up to it what are they GNA call this red thing whoops went didn't do the zoom screen what are they going to call this red thing because it's really interesting this is you know depending on the group it can be called the butterfly valve it can be called the red rotary valve it's been called the intake damper it's been called the exhaust damper because nobody knows yet which way this actually operates but it gets called all different things so nobody is is going to be able to take your Alias that you're sure is perfectly named and find it right now all we know is this thing is wired to the PLC and I can't tell you and this is you know technicians this clicks fairly quick with them this is where all of a sudden you can see the software guys really struggle a little bit I'm not picking on the software guys because actually I I you know we convert a lot of people in software engineering to our industry they they see the light and they realize oh I learned this Hardware stuff I could actually do this really cool but what does the tag name start with if it's touching the PLC that is the one question that you guys struggle with it's going to start with local and we have videos about the addressing really specifically so I'm just going to talk about the compact Logics in the case of the l18 it's going to the base is going to be local colon one and then am I trying to tell that valve to open or am I trying to read its position we're trying to tell it to open so it's going to be an o so before we even think about scrolling we should be going up to our filter here and type local colon o whoops and right there local colon o data and yes this is the unfamiliar machine so I have removed most of the documentation but I did leave the butterfly valve in so that we could see it now here is the interesting part for the ones that just love to scroll and this is why everybody says I need a shirt to you know tell you to quit scrolling because I will watch them at this point on Thursday and almost always their Mouse starts heading over here back to the main routine and I'll tell them take your hand off the mouse and they're like and I'm like what are you trying to do and again they'll be like well I need to get the program open so I can go find it well no that's why we have my third rule because yeah we take our hand off the mouse we K we quit scrolling and then we right click and we're going to get options and this is going to give you Studio 5000 does an outstanding job of giving you options for exactly where you are and if you want to know where something is used in a program then we're going to go to the cross reference and this leads us to the next one that most of you would probably agree with is most of you are going to be looking at these exc's and xos right now and it's the most common thing I get when you guys email me asking me hey can I come to your class and try to learn how to troubleshoot better is you're like I don't know which X iio and XC to go to it's always a struggle well the answer is neither because right now we want to know what is controlling the motor and for that we have this destructive column over here and I really really wish this was called read WR and we just had RS and W's that would be a lot easier I feel but destructive means can this instruction write to this tag value and so we're going to doubleclick on the destructive column that's going to sort it one way but double click on it again if we had a bunch of them that's going to put all of our wise together and I'll but you know do not put in my comments go and take your hand off the keyboard because I know some of you getting ready to do it oh you got a duplicate out you can't do that we had this PLC riddle several riddles ago you can have duplicate outputs on a large programs you will have duplicate outputs so in this case we're going to go to the first one we're not going to think really hard and yes there it is and just to make your life easy I did label input nine so now we would know local colon one col o.data do9 we need to go troubleshoot it now let's go ahead and walk through it one more step because okay let's say this is really complicated I made sure to pick a rung that was fairly simple when you get in the weeds here's where my instruction style works better than most people's or what you're taught and yeah what a lot of you come to me telling me is in fact yeah I wish I should you know I should have used this for a well I can't use it for a PLC riddle if I tell you but I got a new PLC riddle just came up with it but a lot of you are going to tell me that this is a normally open instruction or you're going to tell me it's an examine on or if you're from some of the older logic it'll be an examine if closed this isn't this is a go look for a one and the reason is because it's going to be looking for a one and in this case it actually is an alias called SS and if we Mouse over it has a value of one in it so it looks for a one it has a one so it is true do not always trust the green on the screen when Insanity starts kicking in or your mind is spinning start mousing over these and doing your truce so then we can Mouse over this one this one is looking for a one we Mouse over it has a zero so it is false so this is one issue and then this one is looking for a zero and it has a zero so it is true this one looks for a zero it has a zero so it's false and this one looks for a one it has a zero so it is false so we have two conditions and yes we know that this one's it but I want to go ahead and talk to you I'm going to take you a little further through the run that way we can just kind of understand how to narrow this down so we're going to right click it and we're going to go to the cross reference and I can't tell you here's one of those other times where I tell you to take a hand out the mouse is people get here and they see this and immediately they want to go back to the main routine where they were and start wandering around and here they go they're going to start scrolling and they're screwed at that moment take your hand off the mouse quit scrolling I'm not telling you this to be bossy I'm telling you this because yeah anytime you do that you're gonna get lost we know this is probably the culprit it took us to this cross reference and we really didn't like it and here's the thing is we may not like it but it definitely is the culprit of our issue so we've got to be able to focus in and take them one at a time and eliminate all of them and there's going to be one that's left that is the problem and so yeah we're going to go back and again we're looking for something that wres and ah where' my mouse go so we're at the destructive column and we can take that a step further though because now we're looking for something that writes a what and now we can move over here and we look we needed a one well you don't know what this is if you haven't been into structure text much but I bet you can take a while guess what an equal zero is this is going to go right a zero we have an OTL and if you've watched any of my videos that is not a latch instruction latches and unlatches do not exist in plc's this instruction when it is true will go right a one and when it's false it does nothing this is an output unlatch it goes and writes a zero when it's true it writes a it does nothing when it's false and same with that one that one that one that one that one and that one so before we even went anywhere before we freaked out and went back here we've taken all of this and we brought it down to this is the only place we actually have to look so that's just a little bit on how we kind of teach troubleshooting in this class and like I said this is not the fastest way to troubleshoot but this is is the most repeatable way and as you get into more complicated problems it is the only way and that is what's going to get you to that next level whether it be the next pay level or gets you into the big custom that you're looking for that's really the big thing let's see let me where are we at on this let's see I did Arc living about the about the check engine code yeah many instance they're missing machine schematics let's see yeah oh where is my oh hi Michael good to see you let's see Mark if the machine is truly unfamiliar I recommend looking on the label of the enclosure with a contact in for of the company designed to panel you might be able to get a copy of the logic prints and you're absolutely right and you know here's where we've got to swallow our pride I don't care if it is your most fierce competitor that you really do not like go ahead and call them one y'all may find out you can at least go to launch catch up a little bit talk about you some things but yeah we're a small industry and if if if a competitor called me and had and needed a drawing I would send it to him right away now in this case this is set up in fact I didn't bring a book with me the narrative is this is a machine the company was out of business and there was no proper documentation done and so yeah you're having to work your way all the way through it see Eric fower I always try to find out how how was the machine work problem you know this is interesting um here's why you know you've got to really put faith in your operators and I do see management not doing this enough as you know I I walked you know I walked up one day um you know as a machine that you know I've worked on many times mangor comes up and they're like so Tim how do you think we could adjust blah blah blah and I'm like I don't really know how this machine runs they like they all we always call you when we need work on it I'm like yeah but it's always broke I'm like go talk to the guy who runs the thing I have no idea how this thing's supposed to run that's not to fix it so yeah The Operators are incredibly important to you Dan Stafford you know I did have two people say make sure you back up the program before um before you start fixing it I'm not modifying it and I was like why do you need to modify the program and actually I'm GNA pick on my dad he he he has passed about a decade ago but mechanical genius and I never could figure it out if he had a problem he start adjusting the program I'm like the machine was running last week what are you doing well something's wrong with it nobody changed the program so don't get me wrong we you need a backup of a program but we don't need to actually modify which brings up another point because I do have a lot of I won't say it's you because actually the head maintenance technici is usually not the one it's usually someone further in management we'll say we don't really want our Tech technicians you know editing the code uh do you have any alternatives that you know wouldn't have that part I'm like what do you mean you want them you want them to be able to operate a bolt meter talk on a cell phone to the programmer what are you looking for and here's the thing if you're worried about a technician messing the code up your absolute best idea is to get them as fluent as possible in the PLC programming and in the code because then they're going to understand it enough that it's not going to be this magical thing you know two things that I really will light a fire under me um especially if you do it by Friday is toggling bits and forcing there is no need to do either of those in a program but when people aren't really familiar with it that's the first thing you want to do if I if I could just toggle this bit I know this machine would run okay why is the bit not on though and they're always like well well I don't know I'm like well that that's what you got to go find but if we have them fluent enough in the ladder logic then they're going to be like oh yeah I just need to go figure out why that thing's not on let's see the use the cross reference to find the destructive bit all the time yeah and you know and honestly there is you know we talk a little bit more in detail about it when you come to our training there are times to look at the nose and it actually is dependent on what you cross reference so if we just go back to where we were where's my oh gosh I got yeah if yall saw where my screens are at here because I just this is obviously is not the normal spot so my screens are I kind of just got them over here enough for this live stream but if we um if we go back through this again we know here we needed a one in this box to make that valve open and that's why when we right clicked and we cross referenced here we went to the Y column to figure it out oops I went to the wrong y column okay I accidentally did this we might as well go through it you know people talk all the time oh you can't have duplicate destructive bits well yeah you can often it's called simulation code and here's why I tell you to pay attention to these green bars his there's your only little bit of indicator that this rung is not being ran obviously here's the other Insanity indicator is that yeah those aren't matching up but if we go back there and we go to this one everybody can get to that but yeah when you go to cross reference this one we are looking for a y now what I always tell people is we're always looking to do the opposite of the instruction that we went to so this right here goes and looks for a one so it is no in the destructive column so if you cross reference a no I mean if you're cross reference an instruction that can't write you're looking for the opposite that's how we ended up on the yse there but anyway um destructive I've never yeah you know Levi I wish it was called something else so yeah you may have missed the beginning of it there this column right here is whether something can write to it and I really wish this was called the read write column and then these would all be W's because they could write and these will all be RS because they couldn't because they could only read uh but yeah so this this column right here is the key to troubleshooting really is this one right here because really I don't know how many is here but there's 20 some things and especially if most of you with what you said you're going to go start and look at these exc's and xos trying to find out what's wrong and you almost never need to look at them we only in this case we only needed to look at this one right here and we would have found the problem what else we got because really there there's kind of a little bit about troubleshooting and you know I would love to do some troubleshooting videos also I would love to build some troubleshooting trainers but you know we built one troubleshooting trainer and actually I still have the Prototype over behind my in my junk pile nobody was interested in it you know I think everybody kind of want you know I don't know it you either need this or you need to just sit there and practice practice practice practice that's really the two ways anyway that's all I have for today if you'd like to learn more about my classes and there's probably going to be a link up here later on talking about it and yeah here's a playlist I'll put a little later over here that has some other helpful troublesho

Channel: Tim Wilborne

Views: 41,783

Keywords: Allen Bradley PLC Training, Industrial Automation, PLC Programming, Manufacturing, Tim Wilborne

Id: x_GD2c11tX0

Length: 37min 14sec (2234 seconds)

Published: Thu Jan 04 2024