Experimental Physics and
Industrial Control System

"Owens, PH (Peter)" <[email protected]> · Fri, 23 Apr 2004 14:56:36 +0100

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
> 

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System