drforsythe

MrPLC Member
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Everything posted by drforsythe

  1. micrologix1100 explict message for power flex 525

    Please post a screen shot of the MSG block.
  2. can we control LN298 motor driver with PLC?

    The L298N is an integrated circuit, so a lot of us on this site are not going to be familiar with their use.  If possible, it is best to attach a specification sheet to help us help you.  A quick search shows that the L298N is a device that takes TTL inputs and drives inductive loads such as solenoids, relays and stepper motors.  That being said, the Q Series has output cards that produce TTL levels.  The manuals are available online.
  3. If I remember correctly, there is a box labeled "Replace Communications" on the download screen.  Make sure this box is checked.
  4. What is M code in mitsubishi qd75d4?

    Crossbow, that is not the way I understand it.  I was taught that G codes typically deal with the motion control aspect of a CNC and M codes deal with the canned functions like turning the coolant on and off or turning a spindle on and off.  I am not a CNC expert, but the motion controllers I have used operated this way.  A quick Google search confirmed this.  Maybe it is device specific?
  5. kaiser_will:   Thanks for the response.  I am trying to hone in on my spec by asking what is out there and for experiences of those out there.  My primary experience is control system design.  I have a call in to some reps, but I don't want to rely on salesperson advice only.
  6. What is M code in mitsubishi qd75d4?

    M Code is a standard instruction set for CNC machines.
  7. Controls Engineering

    I will offer this advice:  When designing controls, picture yourself in the position of the operator(s) of the equipment you design.  Try to think of all the ways that the process could fail, then design hardware and software that can help mitigate those issues.  If you work for a company that will allow it, spend some time working as an operator of the equipment you will be designing/programming/improving.  Build empathy for the daily users of the equipment.  If you can understand what it is like to be a daily operator of a machine or system, you can then make it friendlier to use.  Also, use your ears more than your mouth.  Listen to suggestions from those around you.  Being humble will earn you more friends than being cocky and thinking you know it all.  We all want to think that we are the best designers with the every detail thought out.  It is easy to get trapped in the pit thinking that our way of thought is the only, best way.  The truth is that people who regularly use the equipment know a lot and have valuable info to share.  By developing empathy for the users and including them in your design process, you will earn their respect and have allies when it comes to solving any problems that might creep up.  Classes are helpful, but not as helpful as fully immersing yourself into the situation.  If I had to suggest one class, it would have to do with communications.  Not the communications that deal with networks and devices, but interpersonal communications.  Learn how to communicate with the varying types of people you will deal with.  Sorry for the long-winded post.  Best of luck!
  8. Micrologix 1400 Post mortem

    You mentioned that it only made 300 parts.  Unless the output cycles several (hundred) times per part, it sounds like the load requirements do not match the output capabilities, as others have said.  If the inrush is too high for the plc output, place a socketed relay between the plc output and the load.  This way, if the relay fails, it is easily replaced and much less expensive than the plc.  Plus, then no work would have to be done on the plc (changing output addresses or downloading program to new controller).  If you still wish to drive the load directly from the plc and it is inductive, put an appropriate snubber on the output, as others have said.
  9. Request to Print ACD to PDF

    I just sent a PM to you with the pdf file.  I had to zip it to reduce the size.  Forum would not let me post as a reply due to size.   Good luck.
  10. Call ot Old Timers A0J2 & DOS MEDOC

    You should be able to completely clear it by removing the ROM, unplugging the backup battery (if installed) and removing power from the unit for at least 30 minutes.  It has been a while since I regularly supported Mitsubishi products, but their RAM seemed to be backed up for a long time using a capacitor circuit that allowed change out of the battery without losing the RAM.  Even though you have a ROM module, the program is loaded into RAM upon power-up.
  11. Call ot Old Timers A0J2 & DOS MEDOC

    Wow.  I haven't heard of that processor in MANY years!  One thing to think about:  Do you know what the plc was originally programmed with?  The dedicated programming units (GPP?) also known as the "big orange programmer", were widely used before the prices of PCs came down.  When I first got into this business, they were still quite popular - especially with the automotive plants.  The GPPs were able to access parameters that Medoc was not able to.  The biggest parameter set I had problems with were the MELSECNET/MINI parameters.  If a machine was programmed with a GPP and then someone used MEDOC to upload and download, the MELSECNET/MINI devices would no longer work.  The only way to get them to work was to add TO/FROM lines in the logic to set up the network.  The TO/FROM logic replaced the tabular settings available in the GPP. All that said, if the machine was set up originally with a GPP, there could be a parameter that Medoc cannot access and therefore give you a mismatch.
  12. control roon

    You should also explain what your goals are in monitoring these systems.  As kaiser_will added, comm options are important.  Some additional questions to ponder: - Do you want to archive the data, or just see the processes while they run? - Do you need to display alarm conditions? - Will you be using this as a monitor-only function, or will information pass from the control room to the processors? - Do you require some intelligence to predict how your processes will respond in the future? - Will you be programming from this control room?  If so, what firmware is in your CPUs? (This is important to know what OS you will use and if you need to have VMs installed to manage multiple rev levels of the programming software) - Will you need to be notified automatically via text message or email if an alarm occurs?
  13. Looking for programmer help

    Just sent a PM to you with a suggestion.
  14. Kinetix 6000 AM E75 error

    Steve: Ha ha!  Obviously, I did not notice that.  I saw the recent replies and went along for the ride.  I didn't translate John Carvajal's message until you posted the age issue.  For anyone interested, an online translator offered this translation of his post: "It may be dust or moisture on the bus's chassis, please download the drive and blowing the backplane. Once the drives not passing 2 and became a cleaning and now everything is ok". Well, maybe it can help someone in the future...
  15. Kinetix 6000 AM E75 error

    Intermittent high bus voltage faults when not in motion can also be poor grounding.  I have seen this a lot on variable frequency drives.  On the Kinetix platform, faults are cleared when powered down.
  16. Keyence Lasers

    You sent me info stating that you are using the IL 100 with a 1768-L43 CompactLogix and were asking about an EDS file.  First, the IL 100 is just the sensor from what I see on the Keyence website.  It looks like there is an amplifier that should go with it, an IL1000.  When I looked at the info for that module, it looks like it has standard digital outputs for pass/fail and an analog output for measurement.  I do not see a network option that would require an EDS file.  What is your plan for interfacing the sensor to the PLC?  I am not an expert in this particular sensor, but these are the things I see.  
  17. Keyence Lasers

    It would be helpful to know which Keyence laser (and controller) as well as the PLC manufacturer and type.  Don't forget to tell us how the plc will get the values from the laser (analog signal or communication network).  It might be helpful to explain a little about your application.  There is a lot of experience on this forum, but we need details in order to provide the best help.
  18. allen bradley panel troubleshooting

    I agree with PLCMentor- we need to know exactly what is "tripping".  Is it the whole cabinet or just the plc?  If the problem is intermittent, it may require you to monitor several things with a meter that can record the values against time.  Is your PLC powered by AC or DC power?  I would monitor the incoming power, any DC power supplies and try to relate that to what is happening in the process when the fault occurs.  If your main power is staying up, but your DC supply is dipping, then it could be related to a load that is putting your power supply into a current limiting protection mode.  If your AC power is not consistent, try to relate when the fault occurs to the time of day.  Are other machines having the same problem?  Does the fault occur at the same time(s) daily?  If so, it could have to do with how your neighbors are using the power or it could also be the power company inserting or removing correction capacitors to manage the power factor.
  19. Programation problem

    It depends on the equipment that is doing the control.  You need to look at the individual pieces and determine the manufacturer and model before the software can be determined.  Are these machines already built?  If so, then what is the manufacturer of the controller, drives and human machine interface (if any)?  RSLogix500 is the software used for Allen Bradley's SLC and Micrologix programmable logic controllers.  I also don't understand something:  you mention two motors, but three variable frequency drives.  I have seen multiple motors controlled by a single drive, but not vice versa.
  20. RSView32 not toggling bits in RSLogix500

    You should also put up a screen shot of the button configuration as well.
  21. Master-Slave Equipment Protocol

    Often times, nobody thinks of the handshaking signals between equipment until the programmer(s) get involved.  I learned quite quickly that the mechanical engineers or salespeople or the process engineers involved with the equipment will have SOME idea of what is needed, but it is the programmer who will know exactly what is needed.  After getting put into tight situations in the past, I learned to insert myself the process early and state my requirements for I/O and handshake info.  I would often have to plead my case when I first started out, but after proving myself , it is much easier now.  So, the response you got to "sort it out on your end" is quite normal.  What you would do to "sort it out" would be to develop a list of the signals you need and then determine how you will get them (order from machine vendor, outsource or just do it yourself).  If you are a programmer only, without resources to design and install the additional hardware, then you would need to find another source to add the necessary I/O.  Ultimately, the programmer may have to compensate for shortcomings in mechanical or process design, so it is best to be assertive when telling others what you need to make the project successful.
  22. E300 led marking/titles

    Again, Inntele has the answer.  I have not used the software in over 15 years.  I knew there was something out there, but did not realize (or remember) that it was in the design software.  Thanks for the update, Inntele.
  23. E300 led marking/titles

    Inntele has it.  It doesn't get any simpler than that.  I thought I remember seeing (many years ago) a template for filling out those strips, but I could not find it just now.  I remember using the trial and error approach to creating my first strip.  You will have to create your legend, print it, compare it to the size and available space for each LED, then adjust.  Repeat as necessary.  Good luck.  The Beijer terminals were always easy to use and robust in my past experience.
  24. Project cost tracking

    I have done it both ways.  I have placed orders for the components for one machine and then simply copied the requisitions in our purchasing system.  This was helpful to our accounting department, as well.  I have also placed one large order where you simply divide all of the quantities (and costs) by the number of identical machines being built.  For machines that are not identical, it is easier to track if you issue separate orders for the components for each individual machine.
  25. Project cost tracking

    We use an Excel spreadsheet.  We have several rows that explain the breakdown of the budget (mechanical, purchased equipment, electrical, outside services, etc).  Then in the columns, I put the dollar amounts budgeted and the actual spend.  I calculate a running total to show where we are in the budget.  Another helpful thing is to add a column with the PO number and an explanation of what was purchased, who purchased it and from what company.  That way, if you have overruns, you can quickly look back at the chart to see where your money went.