Re: [foxboro] Ramp Question
- From: "Johnson, Alex (Foxboro)" <ajohnson@xxxxxxxxxxx>
- To: foxboro@xxxxxxxxxxxxx
- Date: Tue, 11 Jan 2005 15:56:14 -0500
The 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.,=20
C:B.SPT|RI1
Might be used for a PIDA block setpoint ramp.
If the Rxy parameter is not specified, 0-100 is assumed and the RAMP =
buttons
will use a percentage of that span.
Does this help?
Regards,
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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 IQUEIROLOO@xxxxxxxxxxxxx
Sent: Tuesday, January 11, 2005 12:35 PM
To: foxboro@xxxxxxxxxxxxx
Subject: [foxboro] Ramp Question
Hello all,
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I attached a Helpful Hint with information about ramp. In version 6.1 =
or
later, what happen if I configure the ramp action like?
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BOILER:PRESSURE.SPT , with out |RI1
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In my case, the control range parameter is 5.0 and when I pick the =
ramp, the
variable moves 0,5 from the last value. Does anybody know why?
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Thanks in advance,
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HH#: HH276
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IA INFO: jhp080
File: DISPLAY CFG
Release: ALL
Date: May 14, 1991
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Subject: Configure Ramp Key to a Value
Source: TAC
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If a ramp action is configured directly to a value rather than
PICK1, a range must be specified or the ramping results will be
unpredictable. For example, if the ramp is connected to a
setpoint, BOILER:PRESSURE.SPT, with a range of 0 to 3600 psi,
configure the ramp action (in the Display Configurator) to:
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BOILER:PRESSURE.SPT|RI1
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or
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BOILER:PRESSURE.SPT|R=3D0,3600
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If a ramp button were to be connected to an output, such as
PROCESS:FLOW.OUT, with a range of 0 to 100 percent, configure the
ramp button (in the Display Configurator) to:
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PROCESS:FLOW.OUT|RO1
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or
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PROCESS:FLOW.OUT|R=3D0,100
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If the range is not specified, then the ramp has no way to
calculate the increments, and continuous ramping can occur.
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Ignacio Queirolo Olivera
Control Avanzado
Complejo Industrial Ensenada
Repsol YPF - Qu=EDmica
Tel.: 54 221 429-8400 ext. 26481
Fax: 54 221 429-8400 ext. 26209
iqueiroloo@xxxxxxxxxxxxx <mailto:iqueiroloo@xxxxxxxxxxxxx>=20
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