Re: [foxboro] FBM22 and A/M Station
- From: "Goldie, Shaun S" <Shaun.Goldie@xxxxxxxxxxxxxxxxxx>
- To: "'foxboro@xxxxxxxxxxxxx'" <foxboro@xxxxxxxxxxxxx>
- Date: Fri, 13 Mar 2015 18:23:22 +0000
Thanks for the info Gaylon
No we do not need to survive a loss of CP
They would have gone in initially to survive a loss of operator interface
Shaun
-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx] On
Behalf Of Gaylon F. Hicks
Sent: Saturday, 14 March 2015 3:26 a.m.
To: foxboro@xxxxxxxxxxxxx
Subject: Re: [foxboro] FBM22 and A/M Station
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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NOTICE - This message and any attached files may contain information that is
confidential, legally privileged or proprietary. It is intended only for use by
the intended recipient. If you are not the intended recipient or the person
responsible for delivering the message to the intended recipient,be advised
that you have received this message in error. Any dissemination, copying, use
or re-transmission of this message or attachment, or the disclosure of any
information therein, is strictly forbidden. BlueScope Steel Limited does not
represent or guarantee that this message or attachment is free of errors, virus
or interference.
If you have received this message in error please notify the sender immediately
and delete the message. Any views expressed in this email are not necessarily
the views of BlueScope Steel Limited.
_______________________________________________________________________
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Systems (formerly The Foxboro Company). Use the info you obtain here at
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