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  1. #1
    Benutzer
    Join Date
    Jul 2003
    Posts
    69

    Fanuc OM Alarm 087

    Can anyone please explain what alarm 87 on a Fanuc OM means ?.

    Alarm 087

    When entering data in the memory by using Reader / Puncher interface, though the read terminate command is specified, input is not interrupted after 10 characters read.

    Our programs look like the following;

    %
    O0010(ABC-123-ABC-A.123)
    (ABC-123-ABC-A.123)

    N10
    N20
    N30
    ...
    ...
    M30
    %

  2. #2
    Member
    Join Date
    Aug 2007
    Posts
    790
    Also manual says in alarm description "PCP or I/O unit defective
    There is another explanation of alarm 087 in attached PDF page
    If you need I can send you the total manual
    Attached Files Attached Files

  3. #3
    Benutzer
    Join Date
    Jul 2003
    Posts
    69
    Thanks, your version reads different from the manual we have.

  4. #4
    Gold Member
    Join Date
    Mar 2003
    Posts
    2932
    PS087 is Buffer Overflow. Your PC doesn't stop sending within the
    allotted time (10 characters) of receiving the XOFF.

    Check your Windows - Control Panel - System - Hardware - Device Manager - Ports - under Advanced there's FIFO Buffer settings. Slide them all the way to the left then uncheck "Use FIFO buffers".

    OK all the way out and then restart your PC to have the changes take effect. See if that does the trick.

  5. #5
    Registered
    Join Date
    Aug 2008
    Posts
    151

    Alarm 87

    I think your handshaking isn't working. Most people use software handshaking (Xon/Xoff) or also known as DC codes (DC1 through DC4). Handshaking is meant to stop the transfer until the control needs it.

    Some people use hardware handshaking to accomplish the same thing. If your cable has just three wires, it most certainly is set up for Xon/Xoff.

    Slowing down the baudrate on both ends can sometimes make enough difference so handshaking isn't needed, especially if you are just loading memory, not drip feeding.

    Warren
    www.uptimecorp.com

  6. #6
    Registered
    Join Date
    May 2009
    Posts
    181
    check the io settings.. and baudrates with the computer you are trying to communicate with..

    Iso=1
    if

    I/o channel is
    0 check parameter 2 bit 0 and 552
    1 check parameter 12 bit 0 and 553

    probably a bad setting.. computer setting four stop bits and baud rate must match

  7. #7
    Member
    Join Date
    Dec 2012
    Posts
    43

    Re: Fanuc OM Alarm 087

    I have the same problem but there must be a difference because my file is small.

    I've downloaded the Parmeter file (very long) with no issues.

    I'm trying to change D0300 to 60000 for a timer value. I cannot do it manually so I thought, download it.

    The file has a few lines from D0300 to D0320 in steps if 5

    I get the alarm 087

    I think this has more to do with a restricted write than comms error.

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