Re: [foxboro] Chnage MODE to MAN from AUTO and OP to Zero
- From: Scott McWaters <smcwaters@xxxxxxxxxxxxxxxx>
- To: "foxboro@xxxxxxxxxxxxx" <foxboro@xxxxxxxxxxxxx>
- Date: Wed, 6 Feb 2013 14:24:29 +0000
MCLOPT must be configured True as well.
-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx] On
Behalf Of Rguercio@xxxxxxx
Sent: Tuesday, February 05, 2013 3:28 PM
To: foxboro@xxxxxxxxxxxxx
Subject: Re: [foxboro] Chnage MODE to MAN from AUTO and OP to Zero
Usually tie the PIDA HOLIM parameter to one output of a CALC block that
contains the value zero if in TRICON trip or normal value otherwise. Tie MANSW
parameter to another output that goes momentarily to 1 on TRICON trip, then
back to zero. This "bumps" the PIDA into manual without locking it in,
leaving the operator free to change it. If you don't want the operator to be
able to change it until the TRICON clears, just have the MANSW read a 1 binary
from the TRICON until it clears.
Rick Guercio, P.E.
RG Consulting
918 E Desert Shrub Drive
Washington, UT 84780
713-805-8742 cell
In a message dated 2/5/2013 2:21:02 P.M. Mountain Standard Time,
Srinivasan.Subbiah@xxxxxxxxxx writes:
Hi,
I have a level controller and this controller to go MAN mode, OP to 0% when a
level trip signal from Triconex come into DCS.
I have short of done this in other DCS with existing modules available,
adapting controller's parameters.
As I am quite new to I/A system, How do I proceed? Do I use CALC block?
I have tried using a combination of real, bool and Switch blocks to perform
this. However, operator cannot change the mode.
Would you please provide any ideas? I am sure that this is done in many plants.
Thank you for help,
Regards,
Srini
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