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AlexUT

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Posts posted by AlexUT

  1. I frequently download very different projects to the same PLC for testing .

    This leads to long download time.

    In most of cases this is inevitable.

    a. Flash is erased by blocks, not by Bytes.

    b. Erase and program time cannot be exactly predicted.

    I ALWAYS use simple Download.

    If I have to store project in flash memory, I do this from INFO mode.

    This is much fastest.

     

  2. @FilipM,

    If display, even virtual make variable/tag refresh at each scan (scan time may be number of mSec), will lead to creating queue of messages, which make effect of delay.

    This means, that all created and sent messages are not lost and each one leads to variable/tag refresh.

    Solution:

    To display result in readable form, use intermediate variable to store counter samples each 0.1 Sec.

    This make less queue length and it will show variable/tag with no delay of 1 Sec.

    This solution is much simplest than requirement for fastest refresh.

    Test it and you will fell difference.

    B.R.

     

  3. 1. @FilipM, What refresh rate will be comfortable for operator eye and will be readable?

    You can add to this some network delay, and bear in mind that PLC main task is to manage process, but not fast refresh tags at web page(s) and displays.

    And there is no obligation from LAN/WAN/Internet not for delay, not for jitter, not for retransmissions, etc.

    Believe that optimazing requirements is a way to make a good project design.

    Experts - tell me know if I am wrong.

    2. You published your post in "We're Listening".

    Please tell us what PLC model do you use (I suppose - UniStream) and we will move post to proper topic.

    B.R.

     

  4. Hi,

    Problem may be a result of Windows Update.

    Update may change access rights to directories you use.

    Please contact your IT to solve this problem.

    *To prove this, open Notepad, enter any text and attempt to save file where you wish to save Remote Access files.

    If Windows show error - your IT have to enable write rights to this directory.

    B.R.

     

  5. 1. For install/uninstall use an original installation file you downloaded from Unitronics site.

    2. After finishing installation file download you have to Unblock file in file properties.

    3. Sometime Install/Uninstall going wrong.

    It is not Unitronics software problem, but Windows problem, related to how InstallShield (3rd party) is interacting with Windows.

    In this case please follow next article:

    How to fix "Catastrophic Failure" when Install / Uninstall VisiLogic?

    https://support.unitronics.com/index.php?/selfhelp/view-article/how-to-fix-catastrophic-failure-when-install-uninstall-visilogic

  6. Display of 10" with many elements scalled to 15.6" will require more CPU time to re-draw elements.

    This is why display switch time may be long.

    You have to check PUsage (System->RunTime) to be sure that CPU is not full loaded.

    In common, having 100s of elements, many trends, or many animated images at display you cannot suppose it will work very fast.

     

  7. Hi,

    I posted link to other post, but eventually my post not published.

    --------------------------------------------------------------------------------

    This effect is not related to VisiLogic/U90Ladder, or other Unitronics software.

    It is related to Windows.

    I do not believe that anybody will wait for fix and call this "disaster".

    Simple work-around solve this problem.

    No need to edit INI files or access Registry.

    Yes, this is a little bit annoing, but may be fast corrected.

    1. Alt+Space+M than 1 time touch any arrow key, then move mouse until you find "hidden" pop-up.

    *Last letter M is language dependent.  So you have to find what letter to use.

    2. I found more universal way for my Windows 10 Pro:

    Use Win+Shift+Left/Right Arrow.

    This move "hidden" pop-up between monitors.

    If you connected additional monitor and set it to be Up of main display, then probably Up/Down arrow may work as well.

    Short and fast.

    B.R.

     

  8. 1. SB14/SI14 (for PLC models with internal sensor) show internal temperature on PCB near CPU.

    2. Cold Junction sensor show temperature (SI15) of terminal connector where it is installed.

    3. Internal enclosure temperature is dependent of internal air circulation tupe (matural air flow or fan), and from place you install temperature sensor.

     

    Data sheet always show external to PLC temperature with natural air flow.

    So please distinguish all temperatures.

     

    In most of cases temperature is measured in selected point of enclosure, where it may be maximal.

    You can use SB14 and/or SB15 for reference, as both are not referenced in documentation.

     

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