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Showing results for tags 'ladder logic program'.
Found 153 results
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Hi all, I have a program I am editing in ladder mode It is getting quite large, nearly 30k steps now At some point after a continuous paste (I think) the editing has become glitchy If you try and change an item it inserts the new one and keeps the old one It puts in horizontal and vertical lines seemingly randomly which you have to play around to delete before conversion It is only this one program I tried editing on 2 pc's, no different I cant find anything in mitsubishi manual Has anyone else had same issue? Thanks in advance
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Hi all , I have been using MELSEC - Q series plc for the past two project i dont find any issue with that but for the third project used same PLC same model but there is issue which I found unable to resolve The issue is when i try to communicate PLC using LAN cable by direct ethernet connection it works normally but by communicating using HUB network I cannot communicate, I checked all the parameters setting, I dont know what is the issue even contacted mitshubshi service to troubleshoot but they are not responding So here i am for your guidence to solve this issue see the images below to analyse this issue This connection is direct ethernet connection which works normally The parameters are set and writed to PLC The IP is set to my PC for communication When i try to find the cpu in the network it shows the cpu IP After that I checked for connection Test it show error I have also attached the Network route which i used to communicate Network Drawing.pdf I hope someone will help me to solve this issue Thank you , madhan ravichandran
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Hi all, I would like to know how to communicate scale indicator device mettler Toledo ind 320 using module QJ71C24N-R4 by predefined protocal I also tired to communicate in CH1 with the G.INPUT instruction to communicate when the device in MT continue mode it does communicate but I dont know how to convert value Now by trying modbus communication predefined protocal works fine but i cannot read data the is no SD/RD transmission happening Can anyone help me with this Thank you serial monitor.gxw serial monitor.gxw
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Greetings Can someone tell me about a memory that saves the data even when the machine is turn off? I need one for a speed pulse for a driver and all the memorys that I used where not saving the data. The PLC is an FX3S-MT32
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I'm working with Emerson 90-30 on proficy machine edition and I'm trying to use a string variable to display words on a graphical panel in target 2 but withing the code itself on target one I cant seem to understand how the reference address works? can some one explain how string variables function and how to use them?
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Hello my brother and sister at this forum, please help me, my problem is after i make ladder diagram and iam click button simulation -> Work online simulator ( CTRL + SHIFT + W ) then appear warning "failed to start ladder engine", what a problem?? thanks before
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Most Important Scripting Language For Controls Engineers
OmronOmicron posted a topic in General Topics - The Lounge
As the industry of plc and scada softwares continue to integrate more and more programming languages into their IDE, what is the most common language that should be learned by controls engineers (excluding Ladder Logic)? I mainly use Python and VB for scripting but I am curious what languages other SCADA and PLC programming environments use. Should I be sticking to a specific language and learning it well or just know a little bit of them all? Let me know your thoughts!! -
Recently had to get a program out of a millenium 3 plc which I had programmed a few years ago but the cable would not connect.The only difference this time ,as my laptop no longer had a rs232 port,was the use of a USB to rs232 converter. Having trawled the web I managed to find the circuit of the interface cable below. It looks like the signal from the computer uses the negative going part of the pulses which aren't present on most usb to rs232 converters. Is this correct?
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Hi New here. Trying to create a cumulative timer with zelio soft 2 for a SR2B201BD So, whenever the plc receives a pulse (coming from a coin acceptor) it adds x amount of time, whenever receives a second pulse, adds x amount of time to the time left on the timer. This is a timer for a self serve car wash. Used to work with Ecostruxture Machine and a TM221, but do to a stock break on the supplier and time sensitive project was forced to change to a sr2. Can't seem to make the transformation from my program on ecostruxtur to the zelio. Any help? Thank you
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I am trying to use Reusable files, but it is greyed out. Is there a setting that needs to be enabled to activate it? I am using CX-Programmer v 9.74 Update 1: Apparently, when you create a data structure this gets greyed out
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Array A INT[32] Array Index B INT Destination C INT I am trying to move an Array (A) Element (A[2]) using a symbol (B) in ladder into a destination symbol (C) C = A [ B ] Result: ERROR: Array Index of Operand 1 out of range at rung 1 ( 6, 0 ). The documentation suggests that it is possible, but I am unsure if there is something I am doing incorrectly. Note* Fixed indexing works with no errors Is there another method to accomplish this? PLC : CJ2M CPU31 CX- Programmer: Verion 9.74 Update 1: If I go online to the PLC It does look like the array look up is working. Is the issue with the mov block? Update 2: I changed the memory locations which has caused a different error to appear. This error is clearer but does not explain the manual excerpt I posted further up ERROR: Only the constant can be specified for the index of the array. at rung 5 ( 6, 0 ). Update 3: Solution 1 I managed to hack together a proof of concept using pointers and indirect offsets Update 4: Solution 2 For some strange reason things work as expected inside of the function blocks so I made one where the array is In-Out and with an input and output respectively. Note* External reference to pointers inside of the function block produced an error. Function block Logic Update 5: Solution 3 Now I feel like I am going crazy, I tried just the original code again and it works... I have no idea why and if it was not for all the documentation I would be lost as to why it works now... Update 6: Conclusion It seems to have array indexing work the array index must exist in the D Memory Block. The reason it did not work above is because I somehow had a MOVR block when I tested after moving all the variables to the D Memory Block. I hope this journey helps someone else :)
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there is a device in the program (main) that is outside of the range
techsupoortalpha posted a topic in Mitsubishi
Hello, Good Day All. I am facing this issue while I am going to copy old plc to new plc. but old plc having 4965 steps, once going execute this program to new plc its showing more than 8000 steps. please suggest on this. PFA. -
Hello, I downloaded the program from the M251 PLC program, using the SoMachine4.3 environment. However, the downloaded program does not compile because the library is missing. The library is from a different manufacturer. Is it possible to find this library on the M251 PLC device? is there any way?
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Newbie in the field of Automation here! I have a waste water project that requires operating 6 pumps to empty a sump. The water level in the sump is being monitored by an analog ultrasonic sensor. The analog range is divided into 5 levels; level 1 being the lowest and level 5 being the highest. The way the pumps operate is analogous to the water level, i.e., 5 pumps will run at level 5, 4 pumps will run at level 4, 3 at level 3, 2 at level 2, and only 1 pump will run at level 1. The sixth pump is used to run the pumps sequentially and that's where I need help. Basically, the pumps can not be assigned to a certain water level as this would result in the pumps at the lower level run way more as compared to the pumps assigned to higher levels. The pumps need to alternate so as to keep the running hours of each comparable. Another requirement is that say if pump 1 turns on due to water level rise and then turns off due to water level fall, and again if the water level rises, then the next pump should start instead of pump 1, and so on for the rest of the pumps. Also, if one pump goes on some kind of fault, the 6th pump comes in and runs in its stead until the fault is reset. I'm trying to come up with a ladder program to make all this happen but hoped that I could find some help online. I feel like this is a common project and there should be someone that can give me the proper solution. With thanks, Aafaq.
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Hello to everyone. Nice to meet you all. How are you? I hope you are doing well. I’m developing a program with the purpose of make something similar to a pulse train in the output. However, sometimes I need the output to be a “positive” pulse and sometimes a “negative” one. By positive and negative I mean the polarity in relation to the pulse train source. I’m trying to use a pair of bits in order to switch between the two choices of polarities. I attach a simplified version of the ladder diagram I’ve made. When I thought about the logic, it seemed logical to me, however, it isn’t working as supposed. SM0.4 is a pulse train source. According to the software manual, it is a pulse train with 50% duty cycle and a cycle time of 2 s. That it to say it says at TRUE for one second and return to FALSE for another second. I assign the value of that variable bit to the M0.0 memory bit. I get the negative version of the pulse train logically negating it in the Network #2. I assign the value of two inputs, I0.0 and I0.1, to other two memory bits, M0.1 and M0.2. · When both inputs are in a FALSE state, the output stays FALSE, disregarding the state of SM0.4. (Case #1) · When I0.0 is TRUE, M0.1 is TRUE. However, Q0.0 stays at FALSE no matter SM0.4 is TRUE or FALSE. I attach a pair of pictures. (Case #2) · On the other side, when I0.1 is TRUE, M0.2 is TRUE. In this case, the output shows the correct behavior. It is the negated version of the pulse train source. (Case #3) Has any of you experienced something similar? Is there a better way to execute my purpose? I’m not executing the program, just simulating it with KincoBuilder from Kinco. However, it has always worked fine for me. Thanks for you attention. I look forward for your responses. Kind regards!
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Hello Dear Engineers; I am a PLC beginner learner, so please do not my my question as it sounds little ignorance my question is; how can i insert two output instructions in parallel but from the same input instructions. kindly check the drawing attached, the problem i can not find the right tool in my RSLogix 500 software. please help me and i do highly appreciate that. best regards, Kevin
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What are the types of fuzzy logic syatems and it's applications?
loritharp posted a topic in General Topics - The Lounge
What are the types of fuzzy logic syatems and it's applications? Is the fuzzy systems based on the vague value or real values? What are the real time applications of fuzzy logic. I am writing a thesis at best essay writing services on fuzzy logic and it's applications. -
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Hey, (Programming a M224 with Machine Expert Basic) I'd like to get some input from you guys about a logical task: I have 8 contactors controlled by my PLC outputs, they heat a water boiler. throughout my operation, I require a different amount of heaters (I could move between 1-8 heaters in a single operation) I would like to scramble what contactors I put in use every time I start an operation, in order to not constantly use the same heating elements and wear specific ones out. For example, in the first stage of heating I will use contactor #1, next time I start the operation I would like to use contactor #2 and so on.. How would you approach this problem? SBR? Timers? Thanks
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Anyone you know any books,software or educational package to learn plc program at home Please??
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Hello everyone, may you all bless with the best. Can anyone please help me on connecting and programming In Modbus rtu INVT CHF-100A vfd with FX2n having rs485-bd module. I want to connect 11 vfd and one fx2n plc also .
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Hello everyone, may you all bless with the best. Can anyone please help me on connecting and programming In Modbus rtu INVT CHF-100A vfd with FX2n having rs485-bd module. I want to connect 11 vfd and one fx2n plc also
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Hi, Could anyone help me out on how to extract the digits present in a string in sysmac studio... Thanks in advance !!!
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Hello everyone, I have a Panelview plus 600 ( I know it’s old but I’m trying to get it to work). It’s on a yogurt bucket filler, I don't have any application to run or to do anything. What software do I need on a computer to be able to transfer it to the panelview. Is this even possible? There is nothing in the memory right now but how to I program it and what program do I use? I’m in the Los Angeles area and even willing to pay for someone to come and do it. I need to get this to work, thank you so much.
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According to picture 1, ''Piston A moves to the right. After the set time, K = 4, the normally closed timer T450 contacts open and the normally open timer T450 contacts close.'' But according to picture 2 After the power flow from Left power rail to right power rail, it should directly go to 2nd rung and cause the normally open timer T450 contacts to close only right? but why it will go back 1st rung and cause the normally closed timer T450 contacts to open? Anybody can help explain me regarding this. Thank You in advance
