Re: [foxboro] Chnage MODE to MAN from AUTO and OP to Zero
- From: Rguercio@xxxxxxx
- To: foxboro@xxxxxxxxxxxxx
- Date: Tue, 5 Feb 2013 16:27:59 -0500 (EST)
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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