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Subject: Re: question about fix for AssyGeneric_scanrec_v2.db patch in tpmac module (results in 0.25 s minimum move time)
From: Daron Chabot <[email protected]>
To: "J. Lewis Muir" <[email protected]>
Cc: "[email protected]" <[email protected]>
Date: Tue, 19 Apr 2011 15:03:01 -0400
Also keep in mind that when you descend into the ~0.1s time-scales, you are getting into time-constant territory.

Many mechanical system simply cannot go that fast...


-- dc

On Tue, Apr 19, 2011 at 2:42 PM, J. Lewis Muir <[email protected]> wrote:
On 4/19/11 1:16 PM, Jay Steele wrote:
>        Does anybody have any ideas or implementations to fix
>        TPMAC so that there isn't this minimum move time of
>        0.25 second? I have not dug into the internal logic yet
>        but thought I would check with the EPICS community
>        first.

Hi, Jay.

The last paragraph of the comment (i.e. "A cleaner fix ...")
includes some suggestions on possible ways to do that.

However, I think at some point you will come up against the rate
at which the PMAC is being polled by the driver.  I think this
is 10 Hz right now.  If you need to get that move time below 0.1
seconds, I think the driver poll rate would need to be increased.

Lewis


References:
question about fix for AssyGeneric_scanrec_v2.db patch in tpmac module (results in 0.25 s minimum move time) Jay Steele
Re: question about fix for AssyGeneric_scanrec_v2.db patch in tpmac module (results in 0.25 s minimum move time) J. Lewis Muir

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