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<== Date ==> <== Thread ==>
Subject: Re: What's wrong if a PV with DISA=1 still processes?
From: Andrew Johnson <[email protected]>
To: Dayle Kotturi <[email protected]>
Cc: EPICS Tech-Talk <[email protected]>
Date: Tue, 27 Mar 2007 14:05:08 -0500
Hi Dayle,

Dayle Kotturi wrote: 

I am using SNL to manage the operational mode of a phase and amplitude ctrllr.
Mode is either CALIBRATING or RUNNING.
When RUNNING, I attempt to disallow changes to gain setting via entry{}
clause of state RUNNING where I set DISA to 1 for the gain PV.
I can see DISA field is set correctly to 1 via dbpr.
On the EDM GUI, however, I am still able to change the gain.
The gain is a longout record.

From the doc, I understand that when DISA==DISV==1, processing should
not occur. Why does it?

Are you sure that your gain is actually being sent out to the hardware when DISA==DISV? What disabling the record means is that the record's process routine will not run, thus no device support output or alarm checking, DRVH/DRVL clipping etc. However this does not stop CA from being able to write to the record's modifiable fields, nor any CA monitors from seeing those updated field values (since a ca_put automatically causes a monitor event on the field that is changed).

HTH,

- Andrew
--
The right to be heard does not automatically include
the right to be taken seriously. -- Hubert H. Humphrey
References:
vxWorks, IP-OCTAL-232, interrupt, and reboot John Dobbins
What's wrong if a PV with DISA=1 still processes? Dayle Kotturi
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