fb_epid simulator

Contents

• 1 Example use of the fb_epid simulator
  • 1.1 Interface Screens
  • 1.2 Operation

1 Example use of the fb_epid simulator

The support database has a simulator to help learn how to use the fb_epid support. The simulator models the temperature of something which is subject to some cooling. There is support for heating power to be applied, as directed by the output of the epid record. The cooling could be applied either by adjustment of a continuous variable or by a (simulated) relay-switched application of heating power. Smoother operation is obtained with the continuous variable but not all temperature controllers provide this.

The simulator is based on the swait record. [1]The fields are assigned as follows:

The fb_epid support should be configured like this:

This configuration is defined in the supplied fb_epid.substitutions file.

# $Id: fb_epid.substitutions 14504 2012-02-29 21:11:18Z jemian $

file "$(OPTICS)/opticsApp/Db/fb_epid.db"
  {
    {
        P=xxx:epid1,  
        IN=xxx:epid1:sim.VAL, 
        OUT=xxx:epid1:sim.D, 
        MODE=PID,   
        CALC=A,    
        PERMIT1="xxx:epid1:on.VAL",      
        PERMIT2="",      
        PERMIT3="",      
        PERMIT4=""
    }
  }

1.1 Interface Screens

start a MEDM session with a command such as:

medm -x -macro "P=prj:epid1,C=:sim" fb_epid_sim.adl &

This screen provides access to the simulator, the swait calculation record, and the fb_epid controls that support it.

Figure: fb_epid temperature simulator controls

The calc button brings up this screen:

Figure: temperature simulator calculation

The controls button brings up the standard fb_epid controls:

Figure: fb_epid` main control screen

1.2 Operation

to be written

Footnotes

• [1] - EPICS swait record: http://www.aps.anl.gov/bcda/synApps/calc/swaitRecord.html