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Bypassing I/O wait

  • csd
  • October 1, 2020 at 4:15 PM
  • Thread is Unresolved
  • csd
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    • October 1, 2020 at 4:15 PM
    • #1

    Hello,

    Wondering if anyone has a simple way without using Karel to bypass a wait for a digital input signal if an operation times out. I would like to wait for a certain amount of time to receive the signal. If the signal is not received within that time I would like to jump to a lbl in the program. I'm probably overlooking something simple but I haven't come up with anything.

    Thanks,

    Craig

  • SkyeFire
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    • October 1, 2020 at 4:21 PM
    • #2

    No need for KAREL, TP supports this:

    Code
     $WAITTMOUT=150 ;
     WAIT RI[1]=ON TIMEOUT,LBL[100] ;

    IIRC, the $WAITTMOUT variable is set in 0.01sec, so that "150" would be 1.5sec. You'll need to set it to the value you want in your program. The TIMEOUT is a standard option of the WAIT command. If the timeout, er, "times out" before the WAIT condition is satisfied (RI 1 in this example), then the program will jump to LBL 100.

  • moln4r
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    • October 1, 2020 at 4:23 PM
    • #3

    If I understand correctly than yes, there is a function to do exactly that.

    First you set a timeout:

    $WAITTMOUT=300 ; in this case it's 3sec.

    than add a line:

    WAIT DI[x]=ON TIMEOUT,LBL[1000] ;

  • csd
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    • October 1, 2020 at 4:25 PM
    • #4

    Great! Thank you!

  • moln4r
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    • October 1, 2020 at 4:25 PM
    • #5
    Quote from SkyeFire

    No need for KAREL, TP supports this:

    Code
     $WAITTMOUT=150 ;
     WAIT RI[1]=ON TIMEOUT,LBL[100] ;

    IIRC, the $WAITTMOUT variable is set in 0.1sec, so that "150" would be 15sec. You'll need to set it to the value you want in your program. The TIMEOUT is a standard option of the WAIT command. If the timeout, er, "times out" before the WAIT condition is satisfied (RI 1 in this example), then the program will jump to LBL 100.

    Are sure about the 15 sec?

    May I'm wrong but I think 150 = 1,5 sec

  • csd
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    • October 1, 2020 at 4:25 PM
    • #6

    Thanks! I knew I was missing something simple.

  • SkyeFire
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    • October 1, 2020 at 4:26 PM
    • #7
    Quote from moln4r

    Are sure about the 15 sec?

    May I'm wrong but I think 150 = 1,5 sec

    No, I think you're right (I went back and edited my post). It's hundredths of a second, not tenths.

  • Fabian Munoz
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    • October 1, 2020 at 6:04 PM
    • #8

    FYI

    $WAITTMOUT is a system variable, the moment that you introduce another value, this new value will affect all other applications

    Retired but still helping

  • HawkME
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    • October 2, 2020 at 12:19 AM
    • #9

    I recommend setting $WAITTMOUT right above every time you use it. Then it will always be set correctly for that program.

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