Experimental Physics and
Industrial Control System

Maren Purves <[email protected]> · Thu, 27 Aug 2015 10:12:44 -1000

If you really want to stop it instead you could set it to process PASSIVE.

Maren

On 08/27/15 07:32, Mooney, Tim M. wrote:

You don't actually have to stop the calc record.  You could just stop
the value from increasing.
The following expression holds the increasing value in the 'a' field,
and increases it by 'b' until
it reaches 'c'.  Then it returns the value of 'a' as the expression result.
a:=((a+b)>c?c:a+b); a

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

------------------------------------------------------------------------
*From:* [email protected] [[email protected]] on
behalf of [email protected] [[email protected]]
*Sent:* Thursday, August 27, 2015 12:16 PM
*To:* EPICS Tech-Talk
*Subject:* AW: Records for slow control

Hello,
and how can I stop a calc record?

I want to set a new value like 100, 200, 300 V.... then I want to
compare this value with the current value and increase or decrease this
value every 10 seconds in 5V-steps. ‎Maybe someone have an idea. One
problem is to stop the calc record if current value = new value.

Thanks.
*Von: *Mooney, Tim M.
*Gesendet: *Mittwoch, 26. August 2015 17:20
*An: *[email protected]; EPICS Tech-Talk
*Betreff: *RE: Records for slow control

There are two databases in the synApps std module that demonstrate
different ways of doing this with EPICS records:

std/stdApp/Db/timer.*
std/stdApp/op/adl/timer.*

std/stdApp/Db/countDownTmer.*
std/stdApp/op/adl/countDownTimer.*

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

------------------------------------------------------------------------
*From:* [email protected] [[email protected]] on
behalf of [email protected] [[email protected]]
*Sent:* Wednesday, August 26, 2015 5:09 AM
*To:* EPICS Tech-Talk
*Subject:* AW: Records for slow control

Hello,
but I want to increase the value for example every hour. The time have
to be variable so I need a calcout timer to count for example every 10
second from 0 to ‎50 and then to increase the value step by step. My
problem is how to realise  this with two records. One have to increase
+1, then go to the timer record and wait for example one hour set value
and again: increase +1, then process timer or counter for slowly
periodic scan, set value.

Thanks.
*Von: *Ralph Lange
*Gesendet: *Mittwoch, 26. August 2015 11:58
*An: *EPICS Tech-Talk
*Betreff: *Re: Records for slow control

On 26/08/2015 11:39, [email protected] wrote:

Hello,
I want to set a value like 200 ampere and increase the current value
slowly but how?

I have a timer-record with a PROC field with the option "transition to
zero". A second record increase the value every time. Is it possible
to create records like this:

• Calcout1 timer: scan every second from 1 to 10
• -» then process Calcout2 (via PROC field, without SCAN field) from 1
to 3
• Calcout2 have to wait, process Calcout1 again...

In the ao record that is setting your value, set the field SCAN to "1
second" (or how often you want to "slowly" update) and the field OROC to
the step size that you want to the value to change every time (e.g. 0.1).
No other records needed.

Now, when you write a value like 200 to that record, the output will
step up by 0.1 every second. (Or whatever step size and update rate you
configured.)

Hope this helps,
~Ralph

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System