[foxboro] AW: Increment Values

Hi,
thanks for your answer, but that isn't an good solution for me.

I try to describe it better:
In our plant the operator select an C:B.P with $PICK1 an then
he will change the value.
So it isn't possible to give the right range for each Point.

I am looking for an solution that only increase/decrease (any value)
with an fix value. Like +/- 0.5.
And it doesn't care if we have %, =B0C, t, m=B3/h, .... or what ever.

Regards,
 Dirk

-----Urspr=FCngliche Nachricht-----
Von: Johnson, Alex (Foxboro) [mailto:ajohnson@xxxxxxxxxxx]=20
Gesendet: Donnerstag, 17. Februar 2005 01:07
An: foxboro@xxxxxxxxxxxxx
Betreff: Re: [foxboro] Increment Values

The key is the use of a range or Range Variable (Rxy).

The Range Variables (Rxy) parameters are OM objects that contain 3 =
floating
point values.

Rxy[0] - High scale - HSCxy
Rxy[1] - Low scale - LSCxy
Rxy[2] - Change Delta - DELTxy

The DM/FV is smart enough to set the big (double arrow) and small =
(single
arrow) ramp buttons to a percentage of the span IF the Rxy parameter is
specified on the tag name, e.g.,

C:B.SPT|RI1

Might be used for a PIDA block setpoint ramp.


If the Rxy parameter is not specified, a default is assumed and the RAMP
Buttons will use a percentage of that span.

If you want a custom span, you can specify it as follows:

C:B.P|R=3D<lowRng>,<hiRng>


So, try this:

Make a graphic that contains a rectangle. Configure the select action =
ramp
with the following line:
=20
C:B.SPT|R=3D2.0,98.0

Protection Class: 0

+/- percent control range: 5

Where C:B.SPT refers to some PID block setpoint in your system.

This configuration will clamp the .SPT between  2.0 and 98.0 Obviously =
the
custom range should be within the block's RI1 (LSCI1,HSCI1)

****** Thanks to Leo Moramarco/FoxCanada and Ignacio Queirolo =
Olivera/Repsol
for some of the material above.


Regards,
=20
Alex Johnson
Invensys Process Systems
Invensys Systems, Inc.
10707 Haddington
Houston, TX 77043
713.722.2859 (voice)
713.722.2700 (switchboard)
713.932.0222 (fax)
ajohnson@xxxxxxxxxxx
-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx] =
On
Behalf Of Hegewisch, Dirk
Sent: Wednesday, February 16, 2005 8:28 AM
To: foxboro@xxxxxxxxxxxxx
Subject: [foxboro] Increment Values

Hi Group.

I want change the value of an given C:B.P.
The value should change up/down from current value.
For example in +/-0.5 steps   (newvalue =3D3D oldvalue + 0.5)

The ramp function isn't the right function. Because the C:B.P increase
by percent of the control range.

Has anybody an easy solution for this small problem?

Dirk

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