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

Subject: Re: Insertion Devices Control and EPICS
From: Nick Rees <n.rees@jach.hawaii.edu>
To: tech-talk@aps.anl.gov
Date: Fri, 12 Dec 2003 08:42:33 -1000 (HST)
On Fri, 12 Dec 2003, Rok Sabjan wrote:

> First let me remind everyone on the problem. We have two (or more) 
> motors which we would like to move synchronously. This means to 
> guarantee the movement will start and end at the same time. This is 
> extremely important when changing the gap of an insertion device.

We don't make much use of the OMS system - we tend to use serial line
motor controllers (but they are starting to come with ethernet addresses
as well). Typically we separate setting the next demand and the move
command into separate instructions. If we set demands on multiple axes
before a move instruction the axes move synchronously under hardware
control.  Otherwise the moves are (of course) asynchronous.

Just a thought.

-- 
Nick Rees

Head of Software and Computing Services
Joint Astronomy Centre                   Ph:         +1 (808) 961-3756
660 N. Aohoku Place                      Fax:        +1 (808) 961-6516
Hilo, HI.  96720                         Email: n.rees@jach.hawaii.edu



References:
Insertion Devices Control and EPICS Rok Sabjan

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