Experimental Physics and
Industrial Control System

"J. Lewis Muir" <[email protected]> · Fri, 19 Aug 2011 10:29:09 -0500

On 8/19/11 10:18 AM, Andrew Johnson wrote:
> If you want to know when the VAL field has been set you should be able to use 
> ca_create_subscription() to monitor that or some other related record field.  
> One problem with using the motor.VAL field though is that it's used as both an 
> input (the user's demand position) and an output field (the current position), 
> so you'd get monitor events while the motor is moving.  That might not be what 
> actually want, so you should look at the other fields available and see if 
> monitoring one of them might be more appropriate for your purposes.

Hi, Andrew.

Are you talking about the EPICS motor record?  The VAL field is
only updated after the move completes if certain logic makes it
get synced with the RBV field.  The VAL field does not update as
the motor moves.  The RBV field does.

Lewis

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System