Re: [foxboro] global variable setpoint limiting
- From: "Johnson, Alex (Foxboro)" <ajohnson@xxxxxxxxxxx>
- To: foxboro@xxxxxxxxxxxxx
- Date: Thu, 31 Mar 2005 13:47:35 -0500
I've usually done this by:
1) Creating a pick point on the main graphic that loads P1 with the tag
(C:B.SPT) and raises an overlay (generic).
2) On the overlay
a) Displaying the current value
Connects to $P1
b) Having a data entry box
Connects to P2
c) Having a Confirm button
Runs a script that validates the setpoint and either:
i) Makes the change or
ii) Clears P2 and re-raises the overlay
d) Having a Cancel button
Closes the overlay
Works pretty well and can easily be implemented on your "standard" library
element used for showing the setpoint.
Hope this helps.
Regards,
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 William C. Ricker
Sent: Thursday, March 31, 2005 12:25 PM
To: foxboro@xxxxxxxxxxxxx
Subject: Re: [foxboro] global variable setpoint limiting
Note that a MATH block takes a quarter the space of a CALC.
====
On one site where ops entry error was a concern, we took away
all numeric operator entry fields and gave them only ramp keys.
Crude, but effective.
====
Regards,
William C. Ricker
FeedForward, Inc.
Marietta, GA USA
770.426.4422
wcricker @ feedforward.com
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