Re: [foxboro] supervisory setpoint control
- From: "Johnson, Alex P (IOM)" <Alex.Johnson@xxxxxxxxxxxx>
- To: "foxboro@xxxxxxxxxxxxx" <foxboro@xxxxxxxxxxxxx>
- Date: Mon, 13 Sep 2010 16:54:47 -0500
The Supervisory Setpoint Control is described in B0193RY.
The ACK bit is part of the status word associated with the SUP_IN OM variable
(block parameter). OM Variables, including block parameters, have two or three
parts depending on I/A Series version:
Value
Status
Time Tag (V8.x and later only)
The status part (word) of the SUP_IN parameter includes the ACK bit.
You can only change the ACK bit using a program that calls the correct AIM*API,
FoxAPI, or OM API routine. The ACK bit cannot be changed by a Sequence block or
omset/omsetimp.
In Version 8.4, the system was change to allow one to change SUP_IN without
requiring the use of the ACK bit by offering new SUPOPT parameters.
So, to change the SUP_IN parameter from a computer program you must do one of
the following:
1) Be a V8.4 for all CPs (100% CP270) used by the computer program in which
case the ACK bit can be ignored
2) If you have CPs that must work with the computer program and which are not
at V8.4, you need one of the
Following:
a) AIM*OPC DA Server plus SSCSupport
b) I/A-Connect
The AIM*OPC DA Server and SSCSupport can be found in BuyAutomation.com:
Q0303AE SSCSupport for Windows
Q0301UT AIM*AT OPC Server - Data Access For 1 Server
The I/A Connect product from our German operation combines the OPC DA Server
and the SSCSupport functionality into one package. If you want information on
it, have your IOM Client Sales Executive (account representative) contact
Hermann Draeger at Hermann.draeger@xxxxxxxxxxxx
I don't have a strong opinion on whether one is better than the other.
The "best" solution is to upgrade though that is generally not possible.
Regards,
Alex Johnson
Invensys Operations Management
10900 Equity Drive
Houston, TX 77041
+1 713 329 8472 (desk)
+1 713 329 1600 (operator)
+1 713 329 1944 (SSC Fax)
+1 713 329 1700 (Central Fax)
alex.johnson@xxxxxxxxxxxx (current)
alex.johnson@xxxxxxxxxxxxxxxx (good until September 2010)
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-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx] On
Behalf Of Paulsen, Annukka
Sent: Monday, September 13, 2010 2:46 PM
To: foxboro@xxxxxxxxxxxxx
Subject: [foxboro] supervisory setpoint control
Anyone out there who knows how to set the ".ACK" bit associated with SUP_IN in
a supervisory control setpoint configuration? Specifically what is the
parameter you can set, or is it embedded in the SUP_IN parameter and not
settable otherwise?
We are upgrading a third party advanced control that will write setpoints over
OPC. I know I can do this using a calc block that writes to RSP, but seems that
I should be able to do this much neater by writing to SUP_IN, but without the
".ack" bit set the control block is enabled but not in supervisory control.
Annukka Paulsen
KapStone Charleston Kraft
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