Experimental Physics and
Industrial Control System

"Peterson, Kevin M. via Tech-talk" <tech-talk at aps.anl.gov> · Fri, 2 Oct 2020 21:45:49 +0000

Guilherme,

It isn't possible to implement the closed loop control the way you 
describe with just the motor record, but you can do it if you add other 
EPICS records.

The epid record, which is in the std module, could be used for this purpose:

   https://cars.uchicago.edu/software/epics/epidRecord.html

The fb_epid support in the optics module could also be used for this 
purpose:

   https://epics.anl.gov/bcda/synApps/optics/fb_epid/index.html

The motor being controlled in this way should have RTRY=0 and BDST=0, 
since the both would interfere with the records closing the loop.

Kevin

On 9/30/20 1:14 PM, Guilherme Jovanini Montagner wrote:
> Hi Kevin and all.
> Is it possible to implement this closed loop in such a way that, whenever the motor is taken out of its initial position, EPICS commands it to move back to the original position? This is not happening in the current setup.
> Also, when I try to move, the RCNT increases up to ~50, and it takes a long time for the motor to reach the position RDBD deadband. Does arithmetic mode help here?
> Thanks again.
> 
> Guilherme Jovanini Montagner
> +55 19 99806.9117
> +55 19 2517.8911
> guilherme at setup.com.br
> 	
> Labview Certified Developer
> 

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System