Experimental Physics and
Industrial Control System

Hinko Kocevar <[email protected]> · Wed, 23 Jan 2013 13:13:21 +0100

Hi Mark,

On 01/22/2013 03:48 PM, Mark Rivers wrote:

Hi Hinko,

I was expecting that $(P)ElapsedRealTime would hold some other time
value - maybe cumulative for all MCA channels..

That PV holds the maximum elapsed real time for any channel.  The calculation is done at line 2821 in NDDxp.cpp:

            getDoubleParam(i, mcaElapsedRealTime, &realTime);
            realTime = MAX(realTime, dvalue);

Line 2821 in NDDxp.cpp is more or less EOF in the code I'm looking at -

dxpR3-1. But on line 1814 and 1815 I can find the lines you are

referring too. Thanks!

Correct me if I'm wrong, the DXP system can be composed of different

number of channels (1 - 16 or even more). So the $(P)ElapsedRealTime

shows the maximum Real time as seen by any of the active channels

belonging to the DXP system.

Also since the 16element_dxp.adl looks like a "top" level panel, for
controling 16 detector channels, why would we need to make a separate
instance of it (according to dxpDoc.html) for each detector channel?

It is a top-level panel and you don't need to make a separate instance of it for each detector channel.  I searched dxpDoc.html for the string 16element_dxp.adl and I don't see any mention of making separate instances of it.  Can you please send me the text that you are referring to?

I was reading this on some printed sheets I have - but I do not have

them at hand. The statement is more a deduction from compiling several

information from the code, DB and docs I have, rather than a direct

statement in the docs.

The implication was that dxpHighLevel.template defines the

$(P)ElapsedRealTime the 16element_dxp.adl is showing it. Since

16element_dxp.adl is obviously top level panel, I was surprised to see

it was showing a PV from the template that is instantiated multiple

times (dxpHighLevel.template). That is why the statement "according to

dxpDoc.html" was made, because it indeed does say, in the

dxpHighLevel.template section:

".. One instance of this database is loaded for each detector channel in

the system. .."

Looking at the online versions of panels, templates and docs again, I

can't find the use of $(P)ElapsedRealTime in any ADL panel - only

$(P)ElapsedReal is used. I need to verify this info with my printed docs

later on this week.

Thanks,

--
Hinko

Thanks,
Mark

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Hinko Kocevar
Sent: Tuesday, January 22, 2013 7:20 AM
To: Tech Talk
Subject: DXP ElapsedRealTime

Hi,

I'm trying to understand how the counting of Elapsed Real Time is done
in the $(P)ElapsedRealTime record found in dxpHighLevel.template and
seen on 16element_dxp.adl panel.

I can understand that each MCA record (seen in the mca_simple.adl)
counts its own Elapsed real time in the .ERTM field.

I was expecting that $(P)ElapsedRealTime would hold some other time
value - maybe cumulative for all MCA channels..

Also since the 16element_dxp.adl looks like a "top" level panel, for
controling 16 detector channels, why would we need to make a separate
instance of it (according to dxpDoc.html) for each detector channel?

Best regards,

--
Hinko Kocevar

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System