Experimental Physics and
Industrial Control System

Tim Mooney <[email protected]> · Mon, 18 Jun 2012 23:36:23 -0500 (CDT)

Emmanuel,
I guess I'd use a calcout record to do that:

record(calcout, "watchdog") {
    field(SCAN, "1 second")
    field(INPA, "watchdog.VAL")
    field(CALC, "b?60:a>0?a-1:0;b:=0")
    field(OOPT, "Every Time")
    field(DOPT, "Use OCAL")
    field(OCAL, "a>0?0:1")
    field(OUT, "bark PP")
}

Write 1 to watchdog.B roughly every 60 seconds or less.  If you fail, watchdog.VAL gets decremented to 0, and bark gets set to 1.

----- Original Message -----
From: "Emmanuel Mayssat" <[email protected]>
To: "epics" <[email protected]>
Sent: Monday, June 18, 2012 7:33:31 PM
Subject: watchdog record

What is the simplest way to implement a watchdog PV? 
I would like something that behave as follow: 
* Process set PV to 1 (ping the PV) 
* if PV is no reset to 1 (re-pinged) in the next minute then the PV goes automatically to 0. 

I have been using APS RunControl records to do this, but was wondering if there are other ways... 

Cheers, 
-- 
Emmanuel 

-- 
Tim Mooney ([email protected]) (630)252-5417
Software Services Group (www.aps.anl.gov)
Advanced Photon Source, Argonne National Lab

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System