Experimental Physics and Industrial Control System
Hi Emma,
I agree. The original purpose of RDBD was specifically about retries,
and not also about whether or not to make an initial move. I would
like to explore the consequences of going back to that purpose.
Tim
----- Original Message -----
> From: "Emma Shepherd" <[email protected]>
> To: [email protected]
> Sent: Monday, May 27, 2013 5:57:25 PM
> Subject: Motor record .RDBD field
>
> Hi all,
>
> I've stumbled into this issue a couple of times now so I thought it
> was worth a message to tech-talk.
>
> The .RDBD field of the motor record limits the smallest allowed move
> - quite often we want to set this very low so that we can do small
> step moves. However, in a few cases we also want to use the motor
> record's retry mechanism by setting .UEIP to 'Yes' and feeding the
> encoder into .REP (I'm using the tpmac driver which allows you to do
> this when the encoder is on a different channel). Because .RDBD is
> now used as the retry deadband, we need to make it larger since it
> is not capable of attaining such an accurate position.
>
> It would be better if we could somehow decouple the use of .RDBD in
> the retry sense from the smallest allowed move. Have other people
> run into this and found a solution? In the meantime I need to keep
> switching between modes (toggling .UEIP and changing .RDBD
> appropriately) to allow me to do scans in very small steps followed
> by a wind-back which uses retries to ensure I'm not losing steps.
> It's a bit messy and not ideal.
>
> Of course if we had perfect mechanics we wouldn't need to be doing
> retries at all, but c'est la vie!
>
> Thanks,
> Emma
>
> P.S. I hope I haven't missed a thread on this already, the APS
> website seems to be down at the moment so I can't check
>
> SUPPLIERS: As of 1 January 2013, the Australian Synchrotron Company
> Ltd has changed its business name. However, the trading name will
> remain Australian Synchrotron.
> Please address all quotations and invoices to: Synchrotron Light
> Source Australia Pty Ltd (SLSA), ABN: 18 159 468 256
>
>
- Replies:
- Re: Motor record .RDBD field Pearson, Matthew R.
- References:
- Motor record .RDBD field Emma Shepherd
- Navigate by Date:
- Prev:
Motor record .RDBD field Emma Shepherd
- Next:
Re: streamdevice Dirk Zimoch
- Index:
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
<2013>
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
- Navigate by Thread:
- Prev:
Motor record .RDBD field Emma Shepherd
- Next:
Re: Motor record .RDBD field Pearson, Matthew R.
- Index:
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
<2013>
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024