Experimental Physics and
Industrial Control System

Dr. Bastian Löher <[email protected]> · Tue, 25 Sep 2018 08:02:32 +0200

Dear Abdalla,

I've used stock fanout, dfanoout or seq records in a cascaded manner for 
most of the problems I have encountered.

Usually I use a python script to generate a tree of these records. 
A tree of depth N gives you access to a max of 10^N PVs. There is some 
overhead to this solution, of course, but depending on the application 
this way of doing may beat having to include the additional custom 
record.

The result will be similar to:

-------

record(seq, "param_all")
{
	field(LNK1, "param_seq_A")
	field(LNK2, "param_seq_B")
	...
	field(LNKA, "param_seq_J")
}

record(seq, "param_seq_A")
{
	field(LNK1, "param_1")
	...
	field(LNKA, "param_10")
}

record(seq, "param_seq_B")
{
	field(LNK1, "param_11")
	...
	field(LNKA, "param_20")
}

...

-------

Kind regards
Bastian

On 180925-0548, Abdalla  Ahmad wrote:
> Hello Benjamin
> 
> Thank you very much that would be very helpful. Is there any example on how to use the record?
> 
> Best Regards
> Abdalla
> 
> -----Original Message-----
> From: Benjamin Franksen [mailto:[email protected]] 
> Sent: Monday, September 24, 2018 2:34 PM
> To: Abdalla Ahmad <[email protected]>; [email protected]
> Subject: Re: Fanout PV to many records
> 
> On 06/11/2018 09:49 AM, Abdalla  Ahmad wrote:
> > Is there anything in EPICS database that allows me to write a PV value 
> > to tens of PVs? More than what fanout and dfanout can do? For example 
> > we have a dummy PV that holds a current value to be written to 32 
> > power supplies and I am using a sequencer to achieve this.
> 
> If you are not afraid of custom record types, I have written a few that can have up to 1000 links (the number can be configured at compile time):
> 
> https://www-csr.bessy.de/control/SoftDist/fun/docs/fun.html
> https://www-csr.bessy.de/control/SoftDist/fun/
> 
> Cheers
> Ben
> --
> "Make it so they have to reboot after every typo." ― Scott Adams
> 

-- 
Dr. Bastian Löher

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Gamma spectroscopy

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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System