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hotwires last won the day on February 13

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About hotwires

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  • Birthday 03/29/1981

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    land mobile radio, amateur radio, flying single engine aircraft

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  1. hotwires

    Unistream as HMI to AB SLC500 ethernet

    It was my understanding that the AB SLC 5/05 does not have native MODBUS capability. Additional hardware like a Prosoft MCM-3150 would be required? Sounds like the answer to the question "Is there a simple way to make a Unistream panel communicate with an AB SLC5/05" is.... NO.
  2. I have several SLC500 w/ 5/05 CPU’s on ethernet to PanelViews and Wonderware; is there a way to replace panel views with UNISTREAM panels as HMI’s. I would like to keep program and I/O intact. Thanks
  3. I have it working fine in at least 3 locations.
  4. Kenwood NX-700 or NX-800 VHF/UHF radio transceivers have integrated RS-232 modems with a max speed of 9600 baud. I know of two water treatment applications using these radios with Unitronics Vision OPLC's communicating via MODBUS, the longest distance is 10 statute miles (about 15 kilometers). If you're in a non line of sight, long distance situation these radios can transmit as much as 50W/35W RF power and get the job done. If you have line of sight then the wireless ethernet or RS-232/RS-485 bridges would work at a lower cost. PLEASE REMEMBER TO TAKE THE FRESNEL ZONE INTO ACCOUNT in your path study if you are considering 900 MHz or above. Short of having 100' of tower elevation for yagi or parabolic antennas at each end of the link, I have some doubts. The Kenwood radios do require an FCC radio frequency license. Real world application has proven to me they work excellent for low speed, long distance data communication. No monthly fees as would apply with cellular. Probably less RF interference as can be seen in unlicensed 900, 2400, and 5800 MHz bands. Cellular is subject to outages, if not on the same cell tower a fiber optic cable cut could leave you down. The WiFi band stuff...can be an RF jungle out there. Police, fire, and EMS use VHF/UHF land mobile radio for their primary communication for a reason. How mission critical is your control link? The constant (and worst) enemy of all things RF is ice on the antennas. I've seen UHF yagis in power company SCADA use fiberglass radomes over the elements.
  5. It's happened to me more than once in the early developmental stage of programming. Make a subroutine and then forget to call it from the main routine. I've tried to force the habit of calling the subroutine first then builinding it
  6. canyouseeme.org or the likes on a PC inside the same LAN as PLC can confirm if the port is indeed open on the WAN side. Maybe a typo by IT staff, I can imply that because I'm IT tech myself..... it happens sometimes.
  7. +1 Aus, 250 ohm resistor in series probably won't make any difference . I would definitely confirm the jumper placement .
  8. with PLC powered off, put ohm meter between AI and ground (0V). you should see around 37 ohms. quick way to ID a potential hardware issue.
  9. Are JP1&2 jumpers in A position? Default has them as DI's. It would help to take screenshots while in online mode. I assume the zero and 1024 values are direct read from MI14 and MI17?
  10. Wireshark should work as a packet sniffer in this experiment. Should be doable with Enhanced Vision controllers. sorry I can't exactly tell you how to either.
  11. To the best of my knowledge (done a lot with V430's and ethernet), there is NO provision/capability for the Vision line to act as a VNC server. The Unistream line DOES support VNC. i believe creators and gurus here would all advise looking into a Unistream controller for an application requiring VNC access. The remote operator app does work well on iphone in all of my applications. It uses TCP port, I suspect a custom protocol though. not VNC like in it's nature, it uses image caching.
  12. hotwires

    Add commas to numeric displays

    Commas do aid in quicker recognition of thousands place and above. I've noticed having to stare harder and longer when numbers get into the hundred millions range.
  13. hotwires

    User Interface

    Ordered my copy this evening.
  14. hotwires

    Improvements required

    I've got my head halfway around this. Guess you'd have to draw me a picture (joke). barrier is still in terminology. i have a fair grasp of hardware and the architecture of data processing. programming launguages not so much, to many dialects/flavors out there. Pyrhon and PBASIC are only ones I ever actually wrote anything in (and it was nothing vast). I recall Dan Logee explaining the UDFB (local, Function In, and Function out) tags were processed in RAM and never occupied EEPROM (non volitile) memory until outside of the UDFB's process. Is this in anyway analoguos to "passing" by reference versus value? To me passing rapid change in velocity to overtake another automobile on the roadway. or please pass the carrots, or passing a kidney stone. The English langauge is riddled with abiguity