Re: how NOT to update the record

[Ralph Lange <ralph.lange@gmx.de>]

Hi Tasaddaq,

I am not sure I understand correctly what you want to achieve.
From your last mail, I assume that your record "b" should act as a gate.
Whenever "b" gets 1, you want the counter record "time" to start counting from 0, and the counter record "result" to continue counting from where it was left.
While "b" is 0, the counter record "time"should be reset to 0, the counter record "result" should keep its value.

This can be done using the following database (many other solutions possible):

record (bi, "b") {
}

record (calcout, "time") {
    field(SCAN, "1 second")
    field(INPB, "b")
    field(INPC, "1")
    field(CALC, "B?VAL+C:0")
}

record(calcout, "result") {
    field(SCAN, "1 second")
    field(INPB, "b")
    field(INPC, "1")
    field(CALC, "B?VAL+C:VAL")
}

Cheers,
~Ralph

On 12/07/2015 21:24, Tasaddaq Khan wrote:

Hi Ralph

I have tried many combinition but could not get the desired result. Please have a look at my record,

record (bi, "b"){
    field(DESC, "Increment")
    field(DTYP, "Soft Channel")
    field(FLNK, "time")
}

record (calcout, "time"){
    field(SCAN, "1 second")
    field(INPA, "time")
    field(INPB, "b")
    field(INPC, "1")
    field(CALC, "B=1?a+c:0")
    field(OOPT, "When Non-zero")
    field(OCAL, "")
    field(OUT,  "result PP")
}

record(calcout, "result"){
    field(SCAN, "Passive")
#  field(INPA, "time")
    field(INPB, "result")

    field(INPC, "1")

    field(CALC, "B+C")
}

The record result is derived by the record time. When record b.VAL=1 things works fine but when record b.VAL=0 record time.VAL=0 and record result.VAL holds the last value. Upto here things are working fine. Now when I again put b.VAL=1, time.VAL starts from 1 and it also derives result.VAL again from 1 but not from the last value it holds. Then I disables the field(INPA, "time") (as in the record), the record time still derives the record result and the solution is same. Please have a look and suggest me how to change my values in order to get the desired result.

regards

Tasaddaq

On Fri, Jul 10, 2015 at 12:41 PM, Ralph Lange <ralph.lange@gmx.de> wrote:

Hi Tasaddaq,

You have explicitly configured your record d to do "A+1", with A fetched from record c, and you say that c should be zero if you set b to 0.
The value that record b puts into the VAL field of record d will be overwritten when d processes, fetching A from record c and calculating "A+1".

If you want d to use its own last VAL, d.CALC should be "VAL+1".

~Ralph

On 10/07/2015 07:59, Tasaddaq Khan wrote:

Hi Tim Mooney

The problem is still same and this does not solve the problem. Even with this value of record 'd' does not update.

Is there any other way to solve the problem in EPICS?

tasaddaq

On Thu, Jul 9, 2015 at 7:56 PM, Mooney, Tim M. <mooney@aps.anl.gov> wrote:

Hi Tasaddaq,

One way to do that is like this:

record (calcout, "c"){

field(SCAN, "1 second")

field(INPA, "c")

field(INPB,"b")

field(INPC,"1")

field(CALC,"d:=a+c;b")

field(OCAL,"d")
field(OOPT, "When Non-zero")

field(DOPT, "Use OCAL")
field(OUT,"d PP")

}

Tim Mooney (mooney@aps.anl.gov) (630)252-5417
Software Services Group (www.aps.anl.gov)
Advanced Photon Source, Argonne National Lab

---

From: Tasaddaq Khan [tasaddaq@gmail.com]
Sent: Thursday, July 09, 2015 2:11 AM
To: Mooney, Tim M.
Subject: Re: how NOT to update the record

Hi Tim

I changed my program and use the OOPT field in record c, but the result is same. It sets the value c=0 when b=0 and record d keeps the last value that is fine, but when I again put b=1, it starts from the starting point but not from the last value it keeps which I do not want. I want that my record d keeps the last value when b=0 and starts from this value when I again put the b=1.

record (bi,"b"){
field(FLNK, "c")

}

record (calcout, "c"){

field(SCAN, "1 second")

field(INPA, "c")

field(INPB,"b")

field(INPC,"1")

field(CALC,"B=1?A+C:0")

field(OOPT, "When Non-zero")

field(OUT,"d PP")

}

record(calcout, "d"){

field(INPA, "c")

field(INPB,"1")

field(CALC,"A+B^2")

}

regards,

tasaddaq

On Thu, Jul 9, 2015 at 3:48 AM, Mooney, Tim M. <mooney@aps.anl.gov> wrote:

Hi Tasaddaq,

You can use the OOPT field to specify when the output link should be executed.  c.OOPT="When Non-zero"

Tim Mooney (mooney@aps.anl.gov) (630)252-5417
Software Services Group (www.aps.anl.gov)
Advanced Photon Source, Argonne National Lab

---

From: tech-talk-bounces@aps.anl.gov [tech-talk-bounces@aps.anl.gov] on behalf of Tasaddaq Khan [tasaddaq@gmail.com]
Sent: Wednesday, July 08, 2015 1:59 PM
To: tech-talk@aps.anl.gov
Subject: how NOT to update the record

Dear all

I have three records, when the value in the record "b" is "1" the value in the record c is calculated and the record d is updated as well. Upto this the things are working fine. But I want one more thing that when the b=0, the value of record "c" should become the zero (that is happening) but it should not send the value zero to the record d means at b=0 record c should be updated but it should not update the record d. I want to keep the last value of record d so that when b=1 again then record d should start from the last value that it will hold. Please tell me how to do this?

record (bi,"b"){

field(FLNK, "c")

}

record (calcout, "c"){

field(SCAN, "1 second")

field(INPA, "c")

field(INPB,"b")

field(INPC,"1")

field(CALC,"B=1?A+C:0")

field(OUT,"d PP")

}

record(calcout, "d"){

field(INPA, "c")

field(INPB,"1")

field(CALC,"A+B")

}

regards,

Tasaddaq