Re: [foxboro] two quick questions

Are there a lot of people using the method described below?
:TC100_PIDA.HOLIM.100

I like it but I can remeber having intermittent problems with connecting
paramters in a block to other parameters within that same block.  The most
famous was a block initialization problem when linking the .FBK parameter to
the same blocks .OUT parameter.  An unresolved linkage could occur causing
the controller output to drift toward zero.  Those issue may have been fixed
but we have long since avoided internal linkages.
        It would be nice to know if this link is dependable.
Thanks for any feedback.

Tom VandeWater
Control Systems Developer/Analyst
Dow Corning Corp.
Carrollton, KY  USA

-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx
[mailto:foxboro-bounce@xxxxxxxxxxxxx]On Behalf Of MUGARTET@xxxxxxxxxxxxx
Sent: Thursday, February 12, 2004 12:53 PM
To: foxboro@xxxxxxxxxxxxx
Subject: Re: [foxboro] two quick questions


A while ago I needed to secure the HOLIM parameter of a block and I got =
this answer that may apply to your problem.

> -----Original Message-----
> From: Neil Martin [mailto:neil_martin@xxxxxxxxxxxx]
> Sent: Friday, 6 December 2002 9:57 AM
> To: foxboro@xxxxxxxxxxxxx
> Subject: Re: [foxboro] Output limiting
>
>
>
>
> One way to selectively restrict the parameters for certain blocks from
> being changed outside of the configurator is to secure the parameter =
in the
> configurator by connecting the parameter back to itself and setting =
the
> value.  This means that the parameter can only be changed by entering =
a new
> value in the configurator.
>
> For the HOLIM parameter of a block named TC100_PIDA,  the configurator
> entry for HOLIM might look like the following:
>
> :TC100_PIDA.HOLIM.100
>
> Neil Martin
> Huntsman Corporation
> 7114 North Lamar Blvd
> Austin, TX.  78752
> ph) 512-483-0119

I works as expected, and it's a neat solution. Hope it helps.
Regards,

Mart=EDn R. Ugarte
Control Avanzado y Sistemas
Refiner=EDa La Plata - RepsolYPF
+54-221-4298310 ext. 28034


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