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Retain variables - saving and restoring

zebra
2011-03-03
2011-03-10
  • zebra - 2011-03-03
    1. I have a question about the functions sysrestoreretains and syssaveretains. I am using these functions to save the retain data and to restore the retain using a usb port on my PLC. These functions work on my PLC. HOWEVER, they do NOT work if the file doesn't already exist at the target location. This is only a small nuisance.

    Does anyone who has used these functions know if this limitation is due to my PLC or CoDeSys 2.3?

    1. Related question - Once I save my retain data to my USB, I am not able to do any more reads or writes to the USB unless I remove the USB thumbdrive and re-insert the drive. Any ideas why this might be?

    Thank you!

     
  • spfeif - 2011-03-03

    What PLC?

     
  • zebra - 2011-03-03

    Festo CECX-X-M1

    Thanks.

     
  • zebra - 2011-03-10

    It turns out that the firmware in the PLC was very old. When this PLC is returned to me, I will try updating the firmware and trying it again. Thank you for your input!

     

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