Re: [CAD_CAM_EDM_DRO] PC based machine control - Was Re: Re: Re: Re: CNCEtch-A-Sketch, EggBot

May I second Ray,
It is one thing to give notices of what you do on the machine up to the
office. And I would even support a password protected liberation of
critical work operation. (for example on certain parts that the
machinist
cannot start until the engineer gave green light after visual inspection
of the set up - This is something I fought for in certain factory where
I was the quality assurance guy.)
But I wouldn't permit at all risk somebody remote to hack into machine
operation or plc-progam.
In certain PLC's (I will try to sell soon) the main benefit is to make
maintenance via modem in air-condition systems. But it will not affect
the
personnel safety of an operator. While on a tool machine the operator's
safety will be seriously affected. Only an emergency stop may be
operated via the net work.
Sven Peter

Ray wrote:

>
> > From: Chris L <datac@...>
> > Subject: Re: Re: Re: CNC Etch-A-Sketch, EggBot
> <s>
> >Even though there are many who despise the concept of PC
> > in control, It sure looks like it is going to go there.
> >
> > I can see where the Cad/Cam production world and Industrial
> > communication thru Browsers will indeed collide very soon. We may all
> > need to know machine code and the related "code" for html, Intranet and
> > Extranet use very soon. <s>
>
> Chris L
>
> There has been some lively discussion of this on the Automation List
> <LISTSERV@...> Many of the PE's report attacks on their
> process and machine control networks coming through the office and
> extranet connections. I've been around several computer controlled
> processes that I wouldn't want exposed to hackers, viruses and other
> creeping things.
>
> I don't have any objection to the notion of making process stats available
> to other networks but exposing the control buttons and the whole process
> logic through a two-way connection is stupid. How many times have they
> had to tow that PC controlled warship home to the debug dock? Hey I got
> nervous at NIST when Fred Proctor logged into their EMC powered minimill
> from his office. It wasn't visions of sugarplums I had dancing in my
> head!
>
> It's one thing to let the guy in the air conditioned office know that it's
> taken you nine minutes to change a 300 lb casting in the lathe. It's a
> whole other world to give him even the possibility of remote chuck clamp
> and cycle start buttons! And then you get the hotshot who comes along and
> proclaims that he has the security smarts to prevent unexpected intrusion.
> Microsoft's XP security assertion and emerging issues ought to be
> sufficient proof of concept here.
>
> RayH
>
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