Even if a device did support this bumpless
changeover feature I would still have thought
that it should be overwritten by a constant DOL
just as it is if DOL is a link.
-----Original Message-----
From: Bob Dalesio [mailto:[email protected]]
Sent: 23 April 2004 14:20
To: Owens, PH (Peter); '[email protected]';
[email protected]
Subject: Re: Initialising an ao record from a constant
DOL
As I recall, the analog output record does a read on
initialization. This is required to support a bumpless
reboot on hardware that was cleaver enough not to drive
the value to 0 during a sysReset. As a result, the value
field would be written over by whatever value is
returned
from the device support on initialization.
It sounds like we need an option for not reading the
value
on reboot.
Bob
On Fri, 23 Apr 2004 14:37:23 +0100
"Owens, PH (Peter)" <[email protected]> wrote:
>Yes, I tried that.
>and also setting the VAL field.
>
>I have also attempted to initialise the record from
>the value read back from the device - but unfortunately
>that
>doesn't work either as the input is asynchronous.
>
>Pete.
>>
>> Dear Pete;
>>
>> Have you try to use closed_loop mode with constant
DOL
>>such as the
>> following.
>>
>> record(ao, "$(device):SETSIZE") {
>> field(DESC, "Pump Size")
>> field(DTYP, "ornlSerial")
>> field(OUT, "@digitel mpc size p=1 u=$(port)
>>m=$(unit)
>> p1=$(pump)")
>> field(PINI, "YES")
>> field(DOL, "100.0")
>> field(OMSL, "closed_loop")
>> field(EGU, "l/s")
>> field(DRVL, "0.0")
>> field(DRVH, "1200.0")
>> field(LOPR, "0.0")
>> field(HOPR, "1200.0")
>> field(PREC, "0")
>> }
>>
>> -------------------------------
>>
>> Kukhee Kim
>> Instrument & Control, KSTAR
>> Korea Basic Science Institute
>> 52 Yeoeun-dong, Yusung-gu, Daejeon 305-333
>> Korea
>> Email: [email protected]
>> Tel: +82 42 870 1616 Fax: +82 42 870 1609
Cell:
>>+82
>> 17 513 4849
>>
>>
>>
>>
>> -----Original Message-----
>> From: Owens, PH (Peter) [mailto:[email protected]]
>> Sent: Saturday, April 17, 2004 12:11 AM
>> To: [email protected]
>> Subject: Initialising an ao record from a constant
DOL
>>
>> I'm trying to initialise an analog output record
>> by putting a constant in the DOL field (see below).
>>
>> But the VAL field gets set to zero rather than 100.
>> The record does process and outputs this zero.
>>
>> I can work around this by Initialising from another
>>record
>> using clsed loop mode but it does seem to be a bit of
a
>>cludge
>> (see commented out lines).
>>
>> What am I doing wrong?
>>
>> record(ao, "$(device):SETSIZE") {
>> field(DESC, "Pump Size")
>> field(DTYP, "ornlSerial")
>> field(OUT, "@digitel mpc size p=1 u=$(port)
>>m=$(unit)
>> p1=$(pump)")
>> field(PINI, "YES")
>> field(DOL, "100.0")
>> # field(DOL, "$(device):INITSIZE")
>> # field(OMSL, "closed_loop")
>> field(EGU, "l/s")
>> field(DRVL, "0.0")
>> field(DRVH, "1200.0")
>> field(LOPR, "0.0")
>> field(HOPR, "1200.0")
>> field(PREC, "0")
>> }
>> record(ai, "$(device):INITSIZE") {
>> field(VAL, "200.0")
>> }
>>
>> Pete
>> ---------------------------------------
>> mailto:[email protected]
>> phone:+44 (0)1925 603974
>> fax: +44 (0)1925 603124
>>
>> CLRC
>> Daresbury Laboratory
>> Keckwick Lane
>> Warrington
>> WA4 4AD
>> UK
>>
>>
>>
Bob Dalesio
[email protected]
410 557 0297 Maryland
505 699 1632 Cell Phone
