Re: [foxboro] FBM22 and A/M Station
- From: "Gaylon F. Hicks" <gfhicks@xxxxxxxxxxxxxx>
- To: <foxboro@xxxxxxxxxxxxx>
- Date: Fri, 13 Mar 2015 09:26:06 -0500
Hi Shaun,
In a past life we had about 50 of the FBM22 A/M stations on two units. As
long as the FBM22 is powered and functioning, the A/M station works. The CP
can be a melted puddle on the floor. The A/M station is nothing but buttons
and an indicator - all the logic to drive the output from the FBM22 is in
the FBM22.
When we upgraded another unit at the same plant in 2005, the FBM22 was not
an option. What we did was install a "control station" that was just
pushbuttons and indicators, and built the logic in the CP to somewhat mimic
the old A/M station logic. This configuration requires the CP to be
running. There is no direct replacement for an FBM22, but this approach
kept physical control stations in place that Ops was familiar with, at the
cost of a lot of I/O.
If you absolutely have to be able to survive a complete CP failure, you
could do something fancy like build tracking logic into another CP that
would keep its output slightly below the "controlling" CP (through a high
select diode), and configure your primary CP to fail its output low on a
field bus failure and let your backup CP take over. The drawback of this is
that the more complicated you make the redundancy/failover logic, the more
likely it is going to bite you in your tender spots when you least expect
it. There is elegance in simplicity.
Thanks,
Gaylon
===================================================
Gaylon F. Hicks
Engineered Solutions Inc.
gfhicks@xxxxxxxxxxxxxx
===================================================
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-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx] On
Behalf Of Goldie, Shaun S
Sent: Thursday, March 12, 2015 9:35 PM
To: 'foxboro@xxxxxxxxxxxxx'
Subject: [foxboro] FBM22 and A/M Station
Hi list this is an oldie and not a goodie,
Can anyone tell me the document that explains an FBM22 and Auto/Manual
station
Im after its fallback capability
Can the A/M station drive the output when the CP fails or does it require
the configured blocks to be running
This is all to justify chucking out desk controls as we are running out of
the A/M stations
Shaun
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