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<== Date ==> <== Thread ==>
Subject: Re: What's wrong if a PV with DISA=1 still processes?
From: "Ned D. Arnold" <[email protected]>
To: Dayle Kotturi <[email protected]>
Cc: EPICS Tech-Talk <[email protected]>
Date: Tue, 27 Mar 2007 14:10:50 -0500
Dayle,

I suspect that the record is not really processing, but this does not stop channel access from changing the value of the VAL field. Also, CA will post a monitor when it "puts", making the EDM display update. If the GAIN record is supposed to write to hardware, it probably didn't, even though the VAL field says it did ... confusing!

Set GAIN_record.TPRO = 1 in the IOC and it will show you whether the record processes or was disabled when you write to it.

A better solution might be to use Channel Access security rules such that writes to GAIN are not allowed when RUNNING. This stops CA from writing to VAL and EDM should show you that writing is disallowed.

HTH -

Ned



Dayle Kotturi wrote:
Hello,

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?

It is EPICS R3.14.8.2.

Dayle Kotturi                                            [email protected]
LINAC Coherent Light Source                             office 650-926-4923
Stanford Linear Accelerator Center                         fax 650-926-4778


Replies:
DISP and permissive record. Emmanuel Mayssat
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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