I just have a moment, but...
Get a copy of the document that describes the parameters of the blocks.
Only those parameters in the INPUT list which are marked as connectable can
be connected to with a Write list.
All OUTPUT parameters are not connectable for write. The block "owns" them
and you may not write to the parameter.
The table is confusing if you don't know this, but it basically works as
follows:
1) All parameters can be "gotten" (one-shot get: getval family of
calls)
2) Parameters marked settable can be set (one-shot set: setval family
of calls) under the proper circumstances (inputs if nothing is connected to
it; some outputs - if the block mode is appropriate, e.g. .OUT and MA set to
Manual)
3) All parameters marked as connectable have a "value record" and can
be connected for Read (read lists)
4) INPUT parameters marked as connectable can be connected for write
(write lists) under the proper circumstances (no one else is connected)
5) OUTPUT parameters marked as connectable can NEVER be connected for
write.
I hope this helps.
Regards,
Alex Johnson
The Foxboro Company
10707 Haddington
Houston, TX 77043
713.722.2859 (v)
713.722.2700 (sb)
713.932.0222 (f)
[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
-----Original Message-----
From: Schouten, Frits JF [SMTP:[EMAIL PROTECTED]]
Sent: Wednesday, June 14, 2000 5:52 PM
To: 'Foxboro DCS Mail List'
Subject: RE: OM-List question.
I just found a CAR related to this problem. (CAR 8843. No action
planned. CAR Closed)
The C:B.Variables are of the type OUTPUT, hence the om-error -3.
The only question I have for FOXBORO is: WHY IS IT OF THE TYPE
OUTPUT???
> -----Original Message-----
> From: Schouten, Frits JF
> Sent: Thursday, June 15, 2000 9:53 AM
> To: 'Foxboro DCS Mail List'
> Subject: OM-List question.
>
> Hello peeps,
>
> I've run into a problem with OM-lists.
>
> I'm in the process of replacing Global Variables with
Compound:Block.Variables.
> Up till now that has not been a problem. OM-lists were not
involved so far.
>
> The 'C' program I'm now changing is using OM lists to exchange
data between Global Variables and the Program.
>
> Problem is that, when writing to the list, I'm getting an OM-error
-3 returned /* Write attempt to secured variable */ on the C:B:Variable.
> Just for the test I changed the list point to a real input on a
CALC block and that goes fine.
>
> In 'Select' I have no problems changing the C:B:Variables.
> I can write to the C:B.Variables from a 'C' program using
'set_confirm' with no problems at all.
> I can read/write C:B.Variables using 'omget' and 'omset' from a
vt100 again with no problems.
>
> Any ideas of what I'm doing wrong regarding C:B.Variables in an
OM-list?
>
> Regards,
>
> Frits Schouten
> BHP-NZSteel
>
>
>
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