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 | 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 |
<== Date ==> | <== Thread ==> |
---|
Subject: | Re: Motor home status |
From: | Kurt Goetze <[email protected]> |
To: | [email protected] |
Cc: | [email protected] |
Date: | Thu, 21 Aug 2008 08:53:54 -0500 |
On Thursday 21 August 2008 15:17, Mark Rivers wrote:Hi Ben,
This assumes that the current position information is somehow stillvalid,
at least approximately. However, tehre is no guarantee taht this is sosense
before the motor gets homed. Thus, I agree that soft limits make no
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
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