Experimental Physics and
Industrial Control System

"Kalantari Babak" <[email protected]> · Wed, 3 Dec 2008 14:30:08 +0100

Hi,

You do not need to write your own CA application for that.

Monitor alarm status of your "ai" with a "calcout" record and write to
your "bo" upon occurrence of the conditions. 
This can be done for example as the following:

record(calcout, "$(ALGORITHM)")
{
        field(INPA,"$(YOUR_AI_REC).STAT CP") # monitoring
        field(INPB,"$(YOUR_BO_REC).VAL NPP") 
        field(CALC, "A=3?1:A=5?0:B")
        field(OOPT, "On Change")
        field(OUT,"$(YOUR_BO_REC) PP")
}

Alarm status value for HIHI is 3 and for LOLO is 5.

HTH,
Babak

> -----Original Message-----
> From: [email protected]
[mailto:[email protected]]
> On Behalf Of Ilya V. Kitaev
> Sent: Mittwoch, 3. Dezember 2008 12:33
> To: [email protected]
> Subject: How to implement simple control algorithm
> 
> Hello.
> 
> Could anyone give me advice how to implement following control
> algorithm: I have IOC with two records, for instance, "ai" and "bo";
> ai record with periodic scan, "bo" with passive scan.  How do i turn
> on "bo" record when, for example, HIHI alarm on "ai" record triggered,
> and turn off when LOLO alarm on "ai" record triggered?
> Should i implement this as standalone Channel Access application,
> which will monitor "ai" record and force "bo" record, or it can be
> implemented by connecting records together(how, which records) in IOC
> database?
> 
> Thanks.

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System