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About JRoss

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    Propeller Head
  • Birthday 06/05/79

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  • Website URL http://www.rossautomation.net

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  • Gender Male
  • Location Dillsburg, PA
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  1. No. Motion groups are for grouping axes. In my experience they are rarely used. You can't put a single axis into multiple motion groups anyway. With an MAM, motion is determined by either the direction from current position to command position (absolute positioning), or by whether the value is positive or negative (relative positioning).
  2. The program won't help us answer your question, we need to know the application. Why do you think you might need a second encoder?
  3. Be careful using a one second timer incrementing a counter. There's an inherent error in standard timers that averages to about half a scan time per instance. This can add up over a long period like 8h. Better to use one of the built-in clock pulse bits, if the PLC has them.
  4. As already mention, activation is tied to hardware, could be a hard drive serial number, a network card, or a USB dongle. If your activation is tied to the hard drive serial number, cloning likely will break the activation. But if it's tied to network card or USB dongle, cloning should work with no problem.
  5. You didn't mention the processor. Where is the 2880s limit coming from? In Logix 5000, the preset is in ms, and goes up to 2 billion and change, nearly 600hrs. In Logix 500, the preset go up to 32767, and is in selectable units. The selections vary from CPU to CPU, but IIRC, they all have a 1s unit, which should give you up to 32767s, or just over 9hrs. If you need more than that, see Will's suggestions.
  6. Your message help me a lot on how to create  PLC triggered popup window in HMI.

    Thanks so much,

  7. FX3GE-24M Analog Input

    No problem. That's a common mistake in the Mitsubishi world, particularly with new users. Especially watch out for multiplication and division (16 and 32-bit), that one still gets me if I'm not careful.
  8. FX3GE-24M Analog Input

    That's because you're using a 32-bit instruction on a 16-bit register. Change the instruction from DMOV to MOV.
  9. Hello,JRoss

    I'm looking for the simulator tool for GX DEVELOPER VER.8.91,Where can I find?and could you please send it to me?Thanks

    John Z.

  10. sequential MAM moves

    The settings I'm referring to are hidden by default. To see them, you have to expand the MAM block. There should be a little arrow in the bottom corner. The help manual gives you an idea of what they do. If you post a screenshot of the expanded MAM blocks, I can help you figure out what they're set up to do.
  11. sequential MAM moves

    Depends on the parameters of the instruction. IIRC, you can set the move to either take over the axis, add to the axis, or go into the execution buffer pending completion of the previous move.
  12. Studio 5000 Data Preserved Download Tool

    Didn't even know it existed, I'll have to check it out.
  13. HMI, PC or what else to monitor?

    HMI vs SCADA depends on what you want to do with it. Generally speaking, SCADA is more complex to deploy, but gives you a lot more capability, though things have been converging lately. As in HMIs are getting more capable and SCADA is getting easier and cheaper. If you only need a display at one location (especially if that location is on the production floor) and don't need a historian, I'll second (third?) a Red Lion HMI.
  14. Micrologix 1000

    +1 on posting the program. If the output light is on, it's almost always on in the program. Yes, there's a slight chance it's hardware, but if you transferred the program to a second PLC and got the same behavior, you've eliminated that possibility.
  15. Unused Tags Search

    I haven't really tested it with other HMIs, since the only times I've used a non-AB HMI with an AB PLC are new installations. If I had to guess, I would think that the brand of HMI doesn't really matter. I think the PLC simply recognizes when an outside source accesses a tag and flags it so you can't accidentally delete it. It's not a perfect system, and if anything it's overcautious. It's common to clean out a program and still have a handful of tags that it won't let you delete online just because at some point in the past something tried to access it.