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Matthew

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Posts posted by Matthew


  1. I have a customer who is submitting their machine for CE approval. Everything was moving along nicely until they failed the ESD test.

    It appears that static discharge passing through the Com port on their V350 causes the PLC to shut down. 24 V DC power is still there but the screen is blank. The guy running the test must then shut off power and re-start in order to make the display come on again. Perhaps a little more background would be helpful. The machine has a USB port on the outside of it for end-customer convenience. Inside the control panel, then, is a USB-to-serial converter wired between that USB port and the Com port on the V350. The test seems to be injecting ESD on that external USB port and then running all the way into the PLC's Com port.

    Does anyone out there have experience in this area? I am hoping there is something I can do with software to monitor for this condition and then Reset the PLC. This would be acceptable to CE and we would then pass the test.


  2. It would be nice if this could be handled a little differently. Perhaps through a preference setting. Or we could choose to always have the editor display in English but VisiLogic would give us another warning if the size was inappropriate for any of the languages.

    I have an application with well over 100 displays. It currently has 4 languages (more to be added soon) and one of the languages is Russian. The Russian language is very frequently the longest string and so it's quite difficult for me to know what I'm looking at in VisiLogic. Spanish is hard enough but at least the alphabet is the same as English. With Russion, it's impossible for me to distinguish one phrase or word from another.

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