Experimental Physics and
Industrial Control System

Donny Domagoj Cosic via Tech-talk <[email protected]> · Wed, 11 Dec 2019 09:30:37 +0100

Hi Yong,

Thank you very much for the detailed response. I follow your logic and

it seems like a good solution. All the solution that I came up with were

a lot more complicated so I really enjoy the simplicity of this

solution. The only thing that I had to add to your solution is a new

record that saves the "Dosage:1h" values before every reset. However

with my limited knowledge of EPICS (I just started working with EPICS a

month ago) I dont think i did it properly. I created a new calc record

that looks for the reset and forwards the old Dosage:1h value. Im sure

there is a better way to do this maybe using the OOPT field, however I

was not able to get it to work properly. Am I thinking about this in the

right way?

Regards,
Donny

---
Donny Domagoj Cosic
 Institut Ruđer Bošković, Bijenička cesta 54, 10000 Zagreb, Croatia

Dana 05.12.2019 22:14, Hu, Yong je napisao(la):

Hi Donny,

I did similar applications at NSLS-II: calculate hourly, daily,
monthly, yearly cumulative beam current in the Storage Ring.

Here is one example to test the cumulative dosage in one minute:
"DosagePV" is a simulated PV; "Dosage:1h" is the cumulative dosage;
Whenever one minute passes, the value of “TimeStamp” (@%M) will
change and "Dosage:1h-Reset_" will set "Dosage:1h" to 0.

To calculate hourly, daily, monthly, yearly dosage, simply change %M
in field(INP, "@%M") to %H, %d, %b, %Y.

To preserve the cumulative dosage, you should use EPICS AutoSave
(info(autosaveFields_pass0, "VAL")). Otherwise, the value will be 0
after your IOC is rebooted.

record(calc, "DosagePV") {

 field(INPA, "DosagePV")

 field(SCAN, "1 second")

 field(CALC, "A+1")

 field(FLNK, "TimeStamp")

}

record(stringin, "TimeStamp")

{

 field(DTYP, "Soft Timestamp")

 field(PINI,"YES")

 #field(INP, "@%b %d, %Y %H:%M:%S.%03f")

 field(INP, "@%M")

}

record(calcout, "Dosage:1h-Reset_")

{

 field(INPA, "TimeStamp CP")

 field(CALC, "0")

 field(OUT, "Dosage:1h PP")

}

record(calcout, "Dosage:1h-Calc_")

{

 field(INPA, "Dosage:1h")

 field(INPB, "DosagePV CP")

 field(CALC, "A+B")

 field(OUT, "Dosage:1h PP")

}

record(ai, "Dosage:1h")

{

 field(PREC, "3")

 field(EGU, "blabla")

 field(PINI,"YES")

 info(autosaveFields_pass0, "VAL")

}

There are other ways to calculate the cumulative dosage: use compress
record.

I prefer the first approach above. The approach below works only if
“DosagePV” updates at a regular rate (i.e. 1Hz).

record(compress,"Dosage:1h-Com_")

{

 field(INP,"DosagePV CP")

 field(ALG,"N to 1 Average")

 field(NSAM,"1")

 field(N,"3600")

 field(PREC,"3")

 field(FLNK,"Dosage:1h_")

}

record(calc, "Dosage:1h_")

{

 field(INPA, "Dosage:1h-Com_")

 field(CALC, "3600*A")

 field(PREC, "3")

}

HTH,

Yong Hu

NSLS-II Controls Group

FROM: Tech-talk <[email protected]> on behalf of
"[email protected]" <[email protected]>
 ORGANIZATION: Institut Ruđer Bošković
 REPLY-TO: Donny Domagoj Cosic <[email protected]>
 DATE: Thursday, December 5, 2019 at 9:20 AM
 TO: "[email protected]" <[email protected]>
 SUBJECT: Record for a running sum

Hello,

I developed an IOC for the radiation monitors found throughout our

laboratory. Through this IOC I am able to read in the values of each

probe and display them nicely using CS-Studio. However I would like to

add the ability to the IOC to keep a running sum so I can calculate
the

cumulative monthly and yearly doses throughout the laboratory but I am

not sure how to implement this. I tried searching for similar projects

of examples, but without any luck. Would you be able to provide me
with

some pointers onto how to implement such a feature?

Regards,

Donny

--

Donny Domagoj Cosic

 Institut Ruđer Bošković, Bijenička cesta 54, 10000 Zagreb,
Croatia

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System