Re: stepper vs servo

http://www.sfu.ca/~alan/gecko/err.html

"someone" can be found here, I'm guessing...

Cheers,
Jim

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Jeff Goldberg" <jeff@w...>
wrote:

>
> Not sure on original MACH1, but there are certainly parallel port

input

> pins available for E-Stop and limit switches in MACH2 version

which could

> provide this capability. This in turn can activate (or

deactivate) "Enable"

> output pins on the parallel port which in turn can control your

relay coil

> circuits, motor voltage, etc.
>
> Something I notice in MACH2 version is if you have a pin set up to

send an

> activation pulse and also use the pin as an E-Stop, an E-Stop will

not

> properly control the Enable pin. If your problem is the above, try
> assigning the activate pulse function to pin 0 or an unused pin

and it could

> solve your problem. (Issue has been forwarded to Art at Mach1 for

his

> evaluation).
>
> Regards,
> Jeff
>
>
> -----Original Message-----
> From: Jon Elson [mailto:elson@p...]
> Sent: Sunday, March 23, 2003 8:21 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: Re: [CAD_CAM_EDM_DRO] Re: stepper vs servo
>
>
>
> Monte Westlund wrote:
>
> >--- In CAD_CAM_EDM_DRO@yahoogroups.com, Jon Elson <elson@p...>

wrote:

> >
> >
> >>Now, let me clarify:
> >>
> >>With the Gecko, the signals going between the computer and Gecko
> >>
> >>
> >are
> >
> >
> >>one-way:
> >> From the computer to the Gecko drive. The only indication the
> >>
> >>
> >computer
> >
> >
> >>gets is
> >>that a fault has or has not occured. If the drive faults, then

the

> >>computer had so
> >>idea of actual position.
> >>
> >>
> >
> >Can the computer really get any notification of a fault? Mine
> >doesn't. I'm running Mach1 and if my 320's fault Mach1 keeps

merrilly

> >chugging along.
> >
> >Am I missing something in my controller?
> >
> >
> Maybe. EMC definitely can monitor one of the port input pins to

detect a

> fault. there is a board that someone designed to or the fault

outputs

> of the
> Gecko drives together, and if any one faults, it trips them all to

stop

> motion
> on all axes, and notifies the computer, too. Is there a parallel

port

> pin that
> can detect an e-stop or fault condition?
>
> Jon