Fanuc OM Alarm 087

[ED209]

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
%

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[guhl]

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

[ED209]

Thanks, your version reads different from the manual we have.

[dcoupar]

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.

[WGoyer]

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

[fanucman]

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

[marsheng]

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.

[Solidworks4u]

marsheng, I have a very similar issue after setting up a DNC to USB device, to copy programs, I get 087 alarm. In my manual, after the "Buffer Overflow" part, there is the I/O unit or P.C.B. is potentially defective. Did you find a solution? Many thanks, in advance!

[memoryman]

"I think this has more to do with a restricted write than comms error" wrong, 087 alarm is never caused by that but always some form of comm issue.

[Solidworks4u]

memoryman, thank you. I have read a few more search responses now and there are several suggestions to lower baud rate to 4800 or lower. I did not check that on the PC software, but I will. Many thanks!!

[Solidworks4u]

I revisited the baud rate, set both (PC & mill) to 2400; extended the "time out" setting from 5000 to 65000. Nothing seemed to change the outcome, still 087 alarm. I looked at the memory board, all the places that memory attach (not like RAM in PC, look like pins out the back) are full. Suggestions are welcomed, many thanks, in advance.

[memoryman]

1: did the problem suddenly occur? what changed before that?
2: what are your comm settings on the control and computer?

[marsheng]

From memory I was writing 9000+ programs

Once I change the parameter to give access, all worked.

I also changed to a 5 wire serial cable from 3.

One or 2 of the above fixed the problem.

[memoryman]

I also changed to a 5 wire serial cable from 3." this one.

[Solidworks4u]

marsheng & memoryman, thank you. The mill had no parameters and I received the parameters from the machine builder YCI, because the issue with rs232 port (or parameters) was only able to load parameters manually. This is a new to me mill, I had a close friend that pancreas cancer took away too soon, who was my lifeline with this type of question. The cable is the cable that came with the DNC to CNC device, it has 9 pin female to 25 pin male rs232. It will copy from "Program" (stored in library O0001) is attached file, before and after being in the mill. This is a fake part, needed a file that had motion & drill operation.

I used an ohm meter to tease out if the rs232 was good by starting with female 9 pin with 1 end of the meter; was the MO5 plug in electrical cabinet, only 4 wires are used. The PC comm settings are: software; 4800 baud, 7 bits, even parity, stop bit 2.

The parameters are here:
I / O=1
002 01100111
012 01000001
038 10101000
050 10000011
051 00000011
251 00000010
552 00000010
553 00000010

Suggestions are welcomed. Many, many thanks, in advance.

[marsheng]

I presume you have the parameters in a file.

From memory, I had to enter P0900 and P0901 parameters manually and then I could load via the serial port. (Special Parameters go from 0900 to 0932)

My machine settings was 4800 E 7 bits 2 stop bits.

It appeared to me that loading parameters worked fine with 3 wire but programs needed 5. I could be wrong.

I used Realterm for communications. It tells you what the machine replies. Need to set as shown


.

[zavateandu]

you can also load programs with 3 wires
the 5 wires setup is need it when you drip feed direct from PC a.k.a. DNC mode

[Solidworks4u]

I want to thank everyone, as marsheng has stated parameters 901.6 & 914.4 need set to be correct. I have not tested the cable (my cable is from the DNC kit, I fully expect it to work) to see if 3 or more wire required for drip feed, my concern was the ability to copy programs to memory. When these parameters are edited, it requires the programs in memory to be deleted, BTW. Many thanks!

[Keananjacobus]

Guys Keanan here from South Africa Im 24 years old and Im battling to remove a tl-cp or mg-l abnormal alarm from my Fanuc OM series cnc mill

Really need advice or guidance on how to remove this alarm or fix the problem

Its very difficult to fing guys who can assist with this problem

[marsheng]

Has this anything to do with alarm 087 ?