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JohnR

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JohnR last won the day on February 8

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About JohnR

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  1. Hey All, often times, when I copy a .vlp file from my desktop to my USB thumb drive I get the following warning; I then copy the vlp. from the USB drive to my laptop or another PC I never have a problem with the program when opened, Just curious what "properties" this is referring to...... JohnR
  2. Flex, In my case it's not so much how it was saved, but rather a result of something I've done....... If I have a project open that I'm working on, saved as serial connection, then a some point I change the comms to I/P and go online with a different PLC and use Remote Access to look at something (and that's the caveat, you can do that because Unitronics doesn't compare the online to offline), then I go offline and back to my project, and then later forget I changed comms...... Ooops...... It's an "old-timers" thing, forgetfulness......... :-) JohnR
  3. I've burned myself on this this kid of "fun" more than once...... I'll be working on a project at my desk, and do a download intended for the serial connection to the project on the bench (and having forgot that I was online via I/P to a machine out in the plant earlier in the day), I inadvertently send the download to a running machine causing an interruption on the plant floor....... A little quick thinking when I realize what happened, make a quick download of the correct program back into the machine and get it back running..... Make embarrassing apologies to those who understand by blunder, and tell those who don't that the machine just "glitched"........ All in a days work, :-) JohnR
  4. JohnR

    Upsizing utility

    +1 on Joe's thoughts, I have a V570 project I did a couple years ago, and was kicking around the idea of going to a V700, but I will have to resize graphics on every display..... JohnR
  5. Hi Gonzalo, I follow what you are trying to do, and appreciate the fact that you do have a true safety circuit, but I would still be concerned that by not using the safety circuit when making adjustments you could be putting the user in harms way.... I don't pretend to know exactly what you are controlling, or what hazards are present, but please be mindful of the users surroundings and what could happen........ Is there any stored energy (air, hyd, water), that you need to release before entering the area? If you are going to pursue this, I would at least make the "MCR" a keyed switch (and one that the key can't be removed in the Run position), and the user must have possession of the key while making adjustments. Regards, JohnR
  6. Now, we also do not know what the OP's reason is for wanting to do this, but my first guess is that he wants to create a "safety" of sorts, isolate the outputs so the user can perhaps make adjustments to a machine without shutting down. Now we have to bear in mind that just because the outputs are turned off, the program itself is still running, and any inputs that can change the state of the logic, WILL! And when the outputs are turned back on, the machine may not be in the same state it was. SURPRISE! So, now we could take that same "MCR" contact and inhibit inputs so the program sits still where it was..... And that gets us to the old saying; "JUST BECAUSE YOU CAN, DOESN'T MEAN YOU SHOULD" If this is indeed a pseudo-safety circuit, then we have opened up another can of worms. At least here in the US, a safety circuit is not part of the running program, but instead a separate mechanical (usually redundant) safety relay that takes power away from the PLC's I/O. And that leads to a whole different conversation........ JohnR
  7. Flex.... you are correct if you were to just put a contact in series with the output. my suggestion is to replace the outputs with MB's, set/reset, toggle, or any latching contacts are now done in the logic with the MB that MB then controls the physical output, with the inhibit/start/stop/MCR/whatever-you-want-to-call-it contact before the physical output. JohnR
  8. Or you could replace the output coils with MB coils, then map the MB coils to the associated output coils, then make an MB that you set for your stop condition, and put an inverted contact for that MB before each output you want off. JohnR
  9. JohnR

    User Interface

    Now, I'm certainly not saying that I religiously follow these suggested guidelines from the book. As I said, I usually design/build things the way I see them, and show the users what's going on, some get it, some don't. As Aus said; "I have realised over the years that there are definitely humans that don't have natural intuition at following anything computerish. Carefully step them through a process until they've got it, and a week later they can't do it again, even though everything is on screen clearly displaying what to do" But, I do appreciate the pretense of the book. As the programmers, we all know well what a given control really does in the big scheme of things, but giving the user a defined control that makes sense to how he thinks the process works is what makes a good user interface. And I imagine getting to this point would be easier with a whole design team dealing with every step from conception to finished product, gathering user input and all kinds of thoughts of how it should operate........ But, when you are a one man band, trying to bang out something usable against a deadline, you don't always think about how the user will perceive it...... Flex- Interesting what a little joke dredges up...... JohnR
  10. I've used a lot of V280's over the years, they use to come with the battery installed, and not accessible without opening the unit up, but a couple years they changed the case design and included a battery compartment cover with the battery stored in a plastic bag within, and a sticker on the side reminding you to install the battery JohnR
  11. JohnR

    User Interface

    Like many others in this field, I am the "controls guy" in a manufacturing plant, and I am often the "Judge, Jury, and Executioner" when it comes to building controls for some new process. Sometimes it is hard to predict how the end users will take to a design, there are things that seem simple and obvious to me, and completely baffle the user. I have a third edition copy of About Face, this is an excerpt from the first chapter that kind of sums up the goals of the designer/builder. +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Goal-Directed Design is a powerful tool for answering the most important questions that crop up during the definition and design of a digital product: Who are my users? What are my users trying to accomplish? How do my users think about what they’re trying to accomplish? What kind of experiences do my users find appealing and rewarding? How should my product behave? What form should my product take? How will users interact with my product? How can my product’s functions be most effectively organized? How will my product introduce itself to first-time users? How can my product put an understandable, appealing, and controllable face on technology? How can my product deal with problems that users encounter? How will my product help infrequent and inexperienced users understand how to accomplish their goals? How can my product provide sufficient depth and power for expert users? ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Things that make you go Hmmm........ Regards, JohnR
  12. JohnR

    Run-time error 3709

    well, a week since I cleared my log files and it's still running.............. odd the the "run time error" description does not lead you that direction.... stranger things have happened, just you wait and see.......
  13. JohnR

    Run-time error 3709

    Thanks for the input Cam, I'll look at that tomorrow and see if it helps. BTW, back at work after 3 months of sitting on my behind.......... JohnR
  14. JohnR

    Run-time error 3709

    Bump........ Creators? Anyone? JohnR
  15. Hey All, I know this is an old thread, and the OP has come up with a solution, but just wanted to share for future reference......... A couple years back I had a machine setup with an M91 in an awkward location, and I went through many plc's, not only through physical abuse, but also direct spray from high pressure water washdown damaging the keypad, after buying unit after unit, Joe T (my distributor), was able to get me replacement keypads so I could take the unit apart, peel off the old keypad and apply a new one, much more cost effective in a chronic damage location. I don't recall the part number offhand ....... Joe T, care to interject? JohnR
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