Re: Motor home status

[Kurt Goetze <goetze@aps.anl.gov>]

Benjamin Franksen wrote:
> On Thursday 21 August 2008 15:17, Mark Rivers wrote:
>   
> > > This assumes that the current position information is somehow still
> > >       
> > valid,
> >
> >     
> > > at least approximately. However, tehre is no guarantee taht this is so
> > >
> > > before the motor gets homed. Thus, I agree that soft limits make no
> > >       
> > sense
> >
> >     
> > > during home operation.
> > >       
> > I disagree.  There are other ways besides home to know that a motor is
> > in approximately the correct position.  For example, there may be
> > indicators on the motor slides, or one may use a limit switch as a
> > fiducial.
> >
> > Save/restore motor positions are another example. If the IOC and
> > controller have been rebooted, so the motor has not been "homed" in the
> > memory of the controller or IOC, but the positions are almost certainly
> > still correct.
> >     
>
> Ok, what about a compromise? Add a switch to turn off soft limits during 
> home run.
>
> Cheers
> Ben
>   
Hi Ben,

I think Ron Sluiter's previous suggestion will help to put this 
functionality
(switch to turn soft limits off when homing) into a system, outside of 
the motor record.

Ron Sluiter wrote on 14-Aug-08:
> Users who want/need to do unconditional home search operations can 
> accomplish that at
> a higher level than the motor record by temporarily disabling soft 
> limit checks (DHLM = DLLM = 0)
> before initiating a home search.
Take care,
Kurt