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<== Date ==> <== Thread ==>

Subject: Re: Controling a slit system with 2 hard and 4 soft motorrs
From: "Pearson, Matthew R." <pearsonmr@ornl.gov>
To: Torsten Bögershausen <torsten.bogershausen@esss.se>
Cc: "Tech-talk@aps.anl.gov" <Tech-talk@aps.anl.gov>
Date: Fri, 16 Mar 2018 13:54:36 +0000
Hi Torsten,

> 
> The good news: I got it working!
> There is one question about the collision avoidance:
> If the Gap is 0 and the slit is closed, and I move the center
> there seems to be the risk for a collision, or better said,
> that one blade is slightly started earlier and "pusshing" the other
> one. I am not sure if this is a real-life problem.
> 

This used to be a real life problem at the SNS with some older slit designs. To avoid it we had to move the slit blades sequentially when moving the ‘center’ motor. Which blade moved first depended on which direction the center was being moved. However, almost all our slit assemblies now permit overlapping blades so it’s not an issue anymore.

Cheers,
Matt

> The other thing is that I need to check the calculation of the
> soft limits for the virtual motors.
> The most obvious is that the rule "Gap > 0" is not there.
> (And the other calculations need to be checked)
> I'll set up a system with a simulator.
> 
> And of course, we are setting up a system as well,
> where the synchronization is done in the motor controller.
> 
> 
> 
> On 08/03/18 18:20, Mooney, Tim M. wrote:
>> There is also, in the optics module, 2slit_soft.vdb, which uses soft motor records, instead of ao records, for center and width.
>> Tim Mooney (mooney@aps.anl.gov) (630)252-5417
>> Beamline Controls Group (www.aps.anl.gov)
>> Advanced Photon Source, Argonne National Lab
>> -------------------------------------------------------------------------------
>> *From:* tech-talk-bounces@aps.anl.gov <tech-talk-bounces@aps.anl.gov> on behalf of Goetze, Kurt A. <goetze@aps.anl.gov>
>> *Sent:* Thursday, March 8, 2018 10:51:13 AM
>> *To:* Torsten Bögershausen; Tech-talk@aps.anl.gov
>> *Subject:* RE: Controling a slit system with 2 hard and 4 soft motorrs
>> Hi Torsten,
>> The synApps optics module has support for this type of thing:
>> https://github.com/epics-modules/optics/blob/master/opticsApp/Db/2slit.db
>> Kurt
>> -----Original Message-----
>> From: tech-talk-bounces@aps.anl.gov [mailto:tech-talk-bounces@aps.anl.gov] On Behalf Of Torsten Bögershausen
>> Sent: Thursday, March 08, 2018 10:40 AM
>> To: Tech-talk@aps.anl.gov
>> Subject: Controling a slit system with 2 hard and 4 soft motorrs
>> Hej motorists,
>> I recently learned about the transform record, which can be used to control a slit with 2 physical axes in the way that you can set the values for GAP and CENTER and the position of the physical blades are calculated. (Or vice versa)
>> Does anybody have a super-duper-luxus template file which uses 4 soft motors together with some calc and transform records ?
>> Thanks in advance
>> /Torsten
> 


References:
Controling a slit system with 2 hard and 4 soft motorrs Torsten Bögershausen
RE: Controling a slit system with 2 hard and 4 soft motorrs Goetze, Kurt A.
Re: Controling a slit system with 2 hard and 4 soft motorrs Mooney, Tim M.
Re: Controling a slit system with 2 hard and 4 soft motorrs Torsten Bögershausen

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