Twincat Blue Screen 64-Bit AMD Processor

Posted to Beckhoff Blog on Aug 06, 2009

I shamelessly copied this scenario and solution from the TwinCAT Developer LinkedIn group. Kudos to Steve Maves of Beckhoff Automation USA support, who fixed a customer's bluescreen issue by making the registry tweak below.

I have had a Dell laptop on a project recently that blue screens every time I try to start the TwinCAT System. I am not sure if this is the same problem that is described below, but I am going to try this tweak the next time I have access to the laptop.

I will update this post when I determine if this fixed my problem as well.

The Blue Screen Problem

Numerous blue screens of death (BSOD) are occuring on a development computer.

STOP: 0x0000008E (0xC0000005, 0xDE04BCA5, 0xECDEAA70, 0x00000000)
TcRunTime.sys-adress ED04BCA5 base at ED037000, DateStamp 48e34ca8

The PC System Properties

AMD Athlon 64 Bit,1.5 GHz, 512 MB, Gigabyte motherboard (GA-K8VT800 Pro) with XP pro SP2

The Registry Tweak Solution

Changing the registry key

HKEY_LOCAL_MACHINE\SOFTWARE\BECKHOFF\TWINCAT\SYSTEM KEY
‘DisableC1E’ to value ‘0’

According to Steve: "This regkey disables TwinCAT from using a feature which is only available on Intel CPU's"

Nice work Beckhoff Support! Thanks Steve for publicizing this registry tweak, hopefully it will fix my issues as well.