Re: [foxboro] PID SPT parameter connectable/setable
- From: "Johnson, Alex P \(IPS\)" <alex.johnson@xxxxxxxxxxxxxxxx>
- To: <foxboro@xxxxxxxxxxxxx>
- Date: Sat, 13 Jan 2007 23:17:40 -0500
I've never like the way the documentation is written. It's just confusing, but
it is a compromise made in order to provide a summary table.
There are four possibilities:
1) Getable - one shot get can return a value
2) Setable - one shot set can change a value
3) Connectable for read - change driven values can be returned as
they occured on the scan period
4) Connectable for write - change driven values can be driven into
the value and the value is secured against
changes from any other source.
The SPT parameter is an output. Outputs cannot be connectable for write. The
SPT parameter may or may not be setable based on the state of the LR switch.
So, the correct and complete answer for SPT is:
1) Yes
2) Maybe depends on LR value
3) Yes
4) No
Does this help?
Alex
-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx on behalf of Adam.Pemberton@xxxxxxxxxxxx
Sent: Sat 1/13/2007 10:32 PM
To: foxboro@xxxxxxxxxxxxx
Subject: [foxboro] PID SPT parameter connectable/setable
The Foxboro documentation (I have up to Version 7.1) says that the SPT
parameter on all the PID blocks is connectable and not-settable.
It's my understanding that it's the other way around. You can set the
parameter from the SELECT screen or DM/FV but can only connect to the
RSP parameter.
Whose right?
Regards
Adam Pemberton
Site Electrical & Control Systems Engineer
Lihir Gold Limited
_______________________________________________________________________
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: //www.freelists.org/list/foxboro
to subscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=join
to unsubscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=leave
-- No attachments (even text) are allowed --
-- Type: application/ms-tnef
-- File: winmail.dat
_______________________________________________________________________
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: //www.freelists.org/list/foxboro
to subscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=join
to unsubscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=leave
Other related posts:
