Re: [foxboro] Ramp Question

  • From: <IQUEIROLOO@xxxxxxxxxxxxx>
  • To: <foxboro@xxxxxxxxxxxxx>
  • Date: Wed, 12 Jan 2005 13:51:15 -0300

I supposed that, but in my application I have a percent control range of 5.0 
and when I pick the ramp the variable goes 0.5 from the last value. If the DM 
assumed this percentage (5.0) of the 0-100 span, I think that the variable 
would move 5.0 not 0.5 from the last value because is the 5 percent of 100. Am 
I right?



Ignacio Queirolo Olivera

Control Avanzado

Complejo Industrial Ensenada

Repsol YPF - Química

Tel.: 54 221 429-8400 ext. 26481

Fax: 54 221 429-8400 ext. 26209

iqueiroloo@xxxxxxxxxxxxx <mailto:iqueiroloo@xxxxxxxxxxxxx> 


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 =
arrow) ramp buttons to a percentage of the span IF the Rxy parameter is
specified on the tag name, e.g.,=20
Might be used for a PIDA block setpoint ramp.
If the Rxy parameter is not specified, 0-100 is assumed and the RAMP =
will use a percentage of that span.
Does this help?
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)




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