There may be better ways, but when I've needed to do this I link the remote
setpoint, then lock the PIDA into remote mode by connecting the REMSW to
itself, as in:
:PIDABLOCK.REMSW.1
This, by the way, is the way you link a parameter back to itself, then
provide it with a default value ('1' in this case). I don't know if it is
possible to make reflexive connections with anything other than Boolean
values.
In any event, I don't think it is possible to connect the SPT parameter to
anything. You can connect to it and read it, but you can't connect anything
to it and write to it. That's why I go with the remote setpoint.
Chuck Jones
Refinery Automation Technologist
Tate & Lyle -- Lafayette South Plant
765.477.5324 - Office | 877.536.9219 - Pager
-----Original Message-----
From: Karppi, Dan (SudburySmelter) [mailto:DKarppi@xxxxxxxxxxxxxxxxxxxxxxxx]
Sent: Wednesday, December 15, 2004 2:44 PM
To: 'foxboro@xxxxxxxxxxxxx'
Subject: [foxboro] Lock Setpoint Value in Controller
Hello List Members,
I want to lock the value of the setpoint in a PIDA controller so that it
cannot be changed from the faceplate. I recall that in an earlier post it
was suggested that a configured parameter can be linked to itself in the
block configuration to lock its value. I've searched the archives but
cannot find this post. Does anyone remember how to do this?
Thanks in advance,
Dan Karppi CCST
Instrument Technologist
Falconbridge Limited
Falconbridge, ON
Canada
_______________________________________________________________________
This mailing list is neither sponsored nor endorsed by Invensys Process
Systems (formerly The Foxboro Company). Use the info you obtain here at
your own risks. Read http://www.thecassandraproject.org/disclaimer.html
foxboro mailing list: http://www.freelists.org/list/foxboro
to subscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=join
to unsubscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=leave
*****************************************************************************************************
This email and any files transmitted with it are confidential and intended
solely for the
use of the individual or entity to whom they are addressed. If you are not the
intended
recipient or the person responsible for delivering the email to the intended
recipient, be
advised that you have received this email in error that any use, dissemination,
forwarding, printing, or copying of this email is strictly prohibited. If you
have received
this email in error please notify the sender immediately. Please note that we
reserve
the right to monitor and read any emails sent and received by the Company in
accordance with and to the extent permitted by applicable legal rules.
*****************************************************************************************************
_______________________________________________________________________
This mailing list is neither sponsored nor endorsed by Invensys Process
Systems (formerly The Foxboro Company). Use the info you obtain here at
your own risks. Read http://www.thecassandraproject.org/disclaimer.html
foxboro mailing list: http://www.freelists.org/list/foxboro
to subscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=join
to unsubscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=leave