Experimental Physics and
Industrial Control System

Eric Norum <[email protected]> · Thu, 2 Sep 2010 12:42:15 -0700

Have a look at the database entry for the subroutine record:

record(aSub,"$(user):aSubExample")
{
    field(INAM,"myAsubInit")
    field(SNAM,"myAsubProcess")
    field(FTA,"DOUBLE")
    field(NOA,"10")
    field(INPA,"$(user):compressExample CPP")
}

Since INPA is CPP ("channel process passive") it places a monitor on the compressExample record, which in turn has a monitor on the aiExample record which in turn is forward linked from the calExample record which scans once per second.

So the calcExample kicks off the full chain of record processing at 1 Hz.

See section 5.12.1 INLINK of the application developer's guide for details. 

On Sep 2, 2010, at 7:38 AM, [email protected] wrote:

> Hello,
> 
> I'm diving into the source code of the default example given with epics installation and I don't find how the "calcExample" record (example/testApp/db/dbExample1.db) calls the "myAsubProcess" method (example/testApp/src).
> 
> I understood that the SCAN field runs the periodic call to this method, but how does it call it ?
> 
> Cheers
> Max
> 
> 

-- 
Eric Norum
[email protected]

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System