Experimental Physics and
Industrial Control System

Dayle Kotturi <[email protected]> · Mon, 14 Sep 1998 13:15:21 -0700 (MST)

Hello tech-talk,

My system is running on an mv167 talking to an Allen Bradley PLC
via a KE1785 module. I am getting the following error:

Access Fault
Program Counter: 0x00ed99dc
Status Register: 0x3004
Access Address : 0xae907496
Special Status : 0x0525

 27b18 _vxTaskEntry   +10 : _shell (0, 0, 0, 0, 0, 0, 0, 0, 0, 0)
 56154 _shell         +138: 56172 ([0, 0, 0, 55f78, 0])
 562f4 _shell         +2d8: _execute (f7799e)
 56418 _execute       +ac : _yyparse ([0, 0, 0, f7799e, 0])
 5a682 _yyparse       +514: 5904c (e594e8, e59508)
 59158 _yystart       +758: _iocInit (f6f4a4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0)
e7792e _iocInit       +286: e77fb4 ([&_yyval, 5, &_iocInit, 580d4, 0])
e78068 _iocInit       +9c0: _devInitAbDf1 (1)
e527d8 _devInitAbDf1  +22 : _drvAbDf1InitiateAll ([f77830, e7806a, 1, 64, &_iocInit])
ed5904 _drvAbDf1InitiateAll+38 : _drvAbDf1InitiateLink (db0eb0)
ed5af4 _drvAbDf1InitiateLink+8c : ed8d02 (db10e8, 0)
ed8d7e _drvAbDf1WriteBinary+45e: ed9266 (d8b4c4)
ed92b4 _drvAbDf1WriteBinary+994: ed987c (d8b4c4, f777a0)

I have been seeing (and ignoring) this error for months now. It happens
quite regularly (every 3rd or 4th reboot of the crate). To date, I 
haven't used any debugging tools on this, but have just put in a bunch
of printfs in the code. The last printf to print before the crash is
consistently in the routine "drvAbDf1InitCache" called from within the 
"if (type == absWrite)" clause of drvAbDf1InstallWordIO. And, even 
though the last subroutine to be mentioned in the crash is "drvAbDf1WriteBinary",
no printfs from that routine are printed. 

thanks in advance,
Dayle

PS: On the subject of debugging tools, does anyone have advice? 
Anyone using Stethoscope and find it useful?

***********************************************************************
Dayle Kotturi        
Software Engineer                                   Phone: 808-974-2558 
Gemini North Observatory                            Fax:   808-935-9235

Street Address:  670 N. A'ohoku Place, Hilo, HI  96720
Mailing Address: P.O. Box 485, Hilo, HI 96721
***********************************************************************

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System